10,810 research outputs found
Eumenes congnatus Nguyen, sp. nov.
No full textEumenes congnatus Nguyen, sp. nov. (Figs 7–12) Material examined. Holotype, ♀, “ VIETNAM, Tuyen Quang, Bac Vang Ranger Station, Na Hang Natural Reserve, Na Hang, 22 ° 20 ' 52.6 "N 105 ° 25 ' 49 "E, 10.VI. 2015, LTP Nguyen, DD nguyen & LX Truong [IEBR]. Paratypes: VIETNAM: Ha Giang: 1 ♂, Tung Ba, Vi Xuyen, 3.vii. 2013, TV Nguyen; Bac Kan: 1 ♀, Lang San, Na Ri, 21 0 15 ’N, 106 0 06’E, 270 m, 3-4.viii. 2012, J Kojima, H Nugroho & IED-c; Thai Nguyen: 1 ♂, Xom O, Yen Lac, Phu Luong, 2.vi. 2014, LTP Nguyen; Son La: Lang Son: 1 ♀, Cai Kinh, xi. 2015, LTP Nguyen, DD Nguyen & NT Tran; Son La: 1 ♀, Nam Pam, Muong La, 660 m, 25.vii. 2009, LTP Nguyen, PH Pham & J Kojima; Vinh Phuc: 1 ♂, Tam Dao NP, 21 0 26 ’N, 105 0 37 ’E, 400 m, 20.viii. 2005, J Kojima; Ha Noi: 1 ♂, Suoi Mo, Yen Bai, Ba Vi, 01.vi. 2001, LTP Nguyen Hai Duong: 1 ♀, Hoang Hoa Tham, Chi Linh, 19.viii. 2012, O.T. Nguyen [IEBR]; Lang Son: 3 ♂, Cai Kinh, Huu Lung, 22 ° 39 ' 42.9 "N, 106 ° 15 ' 36 "E, 28 m, 24.xi. 2015, LTP Nguyen, DD Nguyen, NT Tran; Thanh Hoa: 1 ♂, Xuan Lien NR, Hon Can, Van Xuan, Thuong Xuan, 19052 ’ 27.5 ”N, 105014 ’ 20.8 ”E, 106 m, LTP Nguyen; Nguyen; Nghe An: 1 ♀, Pu Mat NP, 26.vii. 2004, LTP Nguyen [VNMN]. Description. Female. Body length 11–12 mm (holotype 11.5 mm); fore wing length 10–11 mm (holotype 10.5 mm). Structure as in Eumenes longus sp. nov., but differs as follows. Head in frontal view slightly wider than high (Fig. 7). Distance between inner eye margins (frontal view) at vertex twice more than at clypeus. Clypeus nearly 1.8 × as highas wide (Fig. 7). Metasomal segment 1 in dorsal view gradually widened from base to apex (Fig. 9), tergum and sternum fused, suture between them distinct almost throughout basal part. T 2 in lateral view as long as wide (Fig. 8). Body with slightly less coarse punctures than in E. longus. Color. Black, with following parts yellow: narrow band along inner eye margin extending from bottom to near ocular sinus, spot between antennal sockets, short line at vertex behind eye, short line at basal margin of dorsal pronotum, apical part of parategula and apical margin of T 1. Legs black. Propodeal valvulae dark brown. Wings dark brown, strongly infuscate, veins dark brown. Male. Body length 10–11 mm; fore wing length 9–10 mm. Structure as in female and male of E. longus but clypeus proportionally longer, in frontal view 2.3 × as long as wide, with sharper teeth (Fig. 10). F 11 propotionaly shorter than in E. longus (Fig. 11). Color as in female. Distribution. Northern Vietnam: Tuyen Quang, Ha Giang, Bac Kan, Thai Nguyen, Son La, Vinh Phuc, Ha Noi, Thanh Hoa, Nghe An. Etymology. The specific name refers to the similarity with its congener E. longus. Remarks. This species is similar to E. longus, but can be easily distinguished from the latter by having T 1 gradually widened from base to apex (gradually widened basally and then parallel in E. longus), T 2 in lateral view as long as wide (1.1 × as long as wide in E. longus), and male clypeus with sharper teeth. This species can be distinguished from two Papuan species by having clypeus nearly 1.8 × as high as wide (less than 1.3 × as high as wide in two Papuan species).Published as part of Nguyen, Lien Thi Phuong, 2016, Two new species of the genus Eumenes Latreille, 1802 (Hymenoptera: Vespidae, Eumeninae) from Vietnam, pp. 583-588 in Zootaxa 4093 (4) on pages 585-587, DOI: 10.11646/zootaxa.4093.4.11, http://zenodo.org/record/27097
Analysis of load shedding strategies for battery management in PV-based rural off-grids
No full textAccepted Author ManuscriptOld - EWI-ESE-DC&S DC systems & Storag
Beth Nguyen: 47th Annual ODU Literary Festival
No full textBeth Nguyen is the author of the recent memoir Owner of a Lonely Heart, which was a New York Times Editors’ Choice Pick, as well as the memoir Stealing Buddha’s Dinner, and two novels. She has received an American Book Award and a PEN/Jerard Award and her work has appeared in publications including The New Yorker, The Paris Review, Time, and Best American Essays. She teaches at the University of Wisconsin–Madison, where she also directs the MFA Program in Creative Writing
Simultaneous effect of pH, deposition time, deposition potential and step potential on the stripping peak current of lead and cadmium by response surface methodology
No full text7 pages.In this paper, a simple voltammetric method has been reported for the lead, and cadmium determination using platinum nanoflowers modified glassy carbon electrode (PtNFs/GCE). The effects of pH, deposition time, deposition potential, step potential were investigated on the stripping peak current of lead, and cadmium based on response surface methodology (RSM). The results of RSM analysis and analysis of variance (ANOVA) have shown that the experimental data could be well described by quadratic regression equations with determination coefficients (R2) of 0.935, and 0.972 for the stripping peak current of lead, and cadmium, respectively. Results of the statistical analysis showed that the fit of the model was good in all cases. The maximum stripping peak current of the lead, and cadmium of 5.54µA, and 2.81µA, respectively were obtained at the optimum levels of process variables (pH (4.72), deposition potential (-1.14V), deposition time (120s), step potential (7mV)). Testing the model to analyze lead, and cadmium on the PtNFs/GC electrode using differential pulse anodic stripping voltammetry (DPASV) and obtained with the stripping peak current of the lead, and cadmium of 5.43µA, and 2.75 µA, respectively
The synthesis of zinc ferrite spinel: Determination of pH value in the co-precipitation step
No full textZinc ferrite (ZnFe2O4) nanomaterial can be facilely and conveniently synthesized via the co-precipitation method from aqueous Zn2+ and Fe3+ salt solutions using sodium hydroxide as the precipitant. However, zinc hydroxide is amphoteric and can be soluble at low and high pH values; therefore, the study on pH for simultaneous precipitation of Fe3+ and Zn2+ to achieve pure ZnFe2O4 spinel is essential. In the present study, we elaborate a theoretical equation expressing the relationship between the zinc concentration in complex formation and pH value in the co-precipitation step. Since then, we synthesized ZnFe2O4 spinel and analyzed the products via various techniques such as thermoanalysis (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis spectra to investigate the appropriate pH for simultaneous precipitation of Fe3+ and Zn2+. The results indicate that in a wide range of pH values, from 7 to 12, ZnFe2O4 single-phase spinel ferrite structure is formed after calcination of the precipitate at 800 degrees C, the average particle sizes (SEM, nm) of ZnFe2O4 samples are in the range of 59.5 nm-85.5 nm (but is non-linear change), and their bandgap values are similar, around 1.96 eV. However, the unwanted appearance of alpha-Fe2O3 phase, the shifting in peak position and the decrease in intensity in the XRD pattern of the spinel products synthesized at pH of 6 and 13, respectively, reflect that the stoichiometric ratio of Zn2+ to Fe3+ in the spinel products is not achieved to 1:2. Such results provide a fundamental basis for choosing the appropriate pH in synthesizing ZnFe2O4 nanoparticles with orientationally structural and optical characteristics.
Simultaneous effect of pH, deposition time, deposition potential and step potential on the stripping peak current of lead and cadmium by response surface methodology
No full text7 pages.In this paper, a simple voltammetric method has been reported for the lead, and cadmium determination using platinum nanoflowers modified glassy carbon electrode (PtNFs/GCE). The effects of pH, deposition time, deposition potential, step potential were investigated on the stripping peak current of lead, and cadmium based on response surface methodology (RSM). The results of RSM analysis and analysis of variance (ANOVA) have shown that the experimental data could be well described by quadratic regression equations with determination coefficients (R2) of 0.935, and 0.972 for the stripping peak current of lead, and cadmium, respectively. Results of the statistical analysis showed that the fit of the model was good in all cases. The maximum stripping peak current of the lead, and cadmium of 5.54µA, and 2.81µA, respectively were obtained at the optimum levels of process variables (pH (4.72), deposition potential (-1.14V), deposition time (120s), step potential (7mV)). Testing the model to analyze lead, and cadmium on the PtNFs/GC electrode using differential pulse anodic stripping voltammetry (DPASV) and obtained with the stripping peak current of the lead, and cadmium of 5.43µA, and 2.75 µA, respectively
Pheretima vungtauensis Nguyen & Nguyen & Nguyen 2018, sp. nov.
No full textPheretima vungtauensis sp. nov. (Figure 1) Material examined. HOLOTYPE: mature Specimen (CTU-EW.166.h01) banana plantation (10o44’57.6 N; 107o14’35.1 E), 206 m aSl, Xa Bang commune, Chau Duc DiStrict, Ba Ria—Vung Tau Province, 25 October 2016, leg. Truong Thuy Ai. PARATYPES: 2 matureS (CTU-EW.166.p02) Same data aS for holotype; 1 mature (CTU- EW.166.p03) Anacardium occidentale plantation (10o39’42.7 N; 107o09’23.0 E), 107 m aSl, Lang Lon commune, Chau Duc DiStrict, Ba Ria—Vung Tau Province, 24 October 2016, leg. Truong Thuy Ai; 1 mature (CTU- EW.166.p04), banana plantation (10o38’25.3 N; 107o21’00 E), 62 m aSl, Son Binh commune, Chau Duc DiStrict, Ba Ria—Vung Tau Province, 25 October 2016, leg. Truong Thuy Ai; 1 mature (CTU-EW.166.p05), Anacardium occidentale plantation (10o38’38.0 N; 107o06’50.0 E), 62 m aSl, Hac Dich commune, Tan Thanh DiStrict, Ba Ria— Vung Tau Province, 24 October 2016, leg. Nguyen Phuc Hau; 2 matureS (CTU-EW.166.p06), near the road (10o29’09.2 N; 107o10’54.6 E), 75 m aSl, Hac Dich commune, Tan Thanh DiStrict, Ba Ria—Vung Tau Province, 24 October 2016, leg. Nguyen Phuc Hau; 1 mature (CTU-EW.166.p07), on the way to the Bao Quan Mountain (10o35’39.2 N; 107o07’24.0 E), 59 m aSl, Toc Tien commune, Tan Thanh DiStrict, Ba Ria—Vung Tau Province, 24 October 2016, leg. Nguyen Phuc Hau. Diagnosis. Medium Size, length 132–169 mm, diameter 4.1–6.1 mm, weight 1.64–3.39 gr (in formalin), and SegmentS 91–125. Three pairS of Spermathecal poreS in interSegmentS 6/7/8/9. Micronephridia Surrounding duct of ampulla. Copulatory poucheS preSent. Ventral diStance between male poreS about 0.35x body circumference. No genital markingS in both Spermathecal and male regionS. InteSt nal origin at xv; caeca Simple, originating at xxvii. TyphloSole Simple, lamelliform. Lymph glandS from 15/16. Holandric. Etymology. Named after the province Ba Ria-Vung Tau where the SpecieS iS widely diStributed. Description. External characters: Body cylindrical; medium Size, length 132–169 mm, diameter 4.1–6.1 mm, weight 1.64–3.39 gr, SegmentS 91–125 (N=9). DorSum greyiSh brown, ventrum paler. ProStomium 1/2 epilobouS (open). FirSt dorSal pore in 11/12 or 12/13. Preclitellar Setae Stouter and SparSer than poStclitellar Setae, 31–49 in viii, 57–82 in xxv, 11–17 Setae between two male porophoreS (N=9); Setal diStance aa = 1.5–2.5ab, zz = 1.5–2zy. Clitellum annular, xiv–xvi, without dorSal poreS and Setae. Female pore Single, in mid-ventral xiv. Three pairS of Spermathecal poreS in interSegmentS 6/7/8/9; ventral diStance between Spermathecal poreS approximately 0.4x body circumference. Male poreS located inSide copulatory poucheS on the Setal ring xviii; ventral diStance between male poreS about 0.35x body circumference. Genital markingS abSent in both Spermathecal and male pore regionS. Internal characters: Septa 5/6/7/8 thick, 8/9/10 abSent, 10/11/12 /13 Slightly thick. OeSophageal gizzard within viii–x. InteStinal origin at xv; caeca Simple, originating at xxvii, and extending anteriorly to xxiv or xxiii. LaSt heartS in xiii. Pharyngeal micronephridia developed in 5/6/7. TyphloSole Simple, lamelliform. Lymph glandS bag- Shaped, from 15/16. Three pairS of Spermathecae in vii–ix. Ampulla large, egg-Shaped; duct Short, ca. 1/3 ampulla length, Somewhat conStricted in the middle; micronephridia Surrounding duct of ampulla, moSt developed in Spermathecae at 6/7. Diverticulum Shorter than ampulla in Situ, but longer when extended, Strongly folded, directly attached to the middle of ampulla duct; diStal part of diverticulum enlarged to be a Small, oval-Shaped Seminal chamber. AcceSSory glandS 2–3, Small, muSroom-Shaped; duct long, attached to baSe of ampulla. Holandric. TeStiS SacS developed in x and xi, unconnected. Seminal veSicleS well developed in xi–xii. OvarieS inviSible; oviduct well developed after Septum 12/13. ProState glandS deeply lobuled, paired in xvi–xix; proStatic ductS long, Somewhat enlarge in middle, open in large chamber. AcceSSory glandS large and covering copulatory pouch. DNA barcodes. A 660bp fragment of the mitochondrial gene Cytochrome c oxydaSe Subunit I waS Sequenced from the holotype, and uploaded to GenBank with the acceSSion number MF481211. TABLE]. Morphological comparison of P.vungtauensis sp nov. with similar species within the P. dubia species group. All species lack genital markings in the spermathecal anđ male pores region. AG: accessory glanđs. MP: Male pores. Remarks. The new SpecieS can be keyed to the dubia group in SimS & EaSton (1972) characteriSed by having three pairS of Spermathecal poreS in interSegmentS 6/7/8/9. ThiS group currently conSiStS of ten SpecieS, Pheretima dubia HorSt, 1893, P. korinchiana Cognetti, 1922, P. poiana MichaelSen, 1913, all from IndoneSia; P. philippina RoSa, 1891, P. callosa GateS, 1937, P. balbalanensis Hong & JameS, 2010, P. banaoi Hong & JameS, 2010, P. globosa Hong & JameS, 2011, P. julkai Hong & JameS, 2011, P. lamaganensis Hong & JameS, 2011, all from the PhilippineS. Morphological differenceS among theSe SpecieS are Summarized in Table 1. Among theSe SpecieS, the new SpecieS iS fairly Similar to Pheretima balbalensis, P. banaoi, P. julkai, and P. lamaganensis, all from the PhilippineS, in having three pairS of Spermathecal poreS in interSegmentS 6/7/8/9, no genital markingS in Spermathecal and male regionS, and inteStinal caeca Simple. Pheretima balbalanensis iS diStinguiShed by inteStine beginning in xvi, caeca from xxviii, typhloSole veStigial, lymph glandS from xxviii, whereaS P. vungtauensis sp. nov. haS inteStine originating at xv, caeca from xvii, typhloSole lamelliform, bag- Shaped lymph glandS from 15/16. The new SpecieS iS different from P. banaoi in larger ventral diStance between maleS porophoreS (0.35x circumference vS. 0.19–0.22x), inteStinal origin (xv vS. xvi), the beginning of lymph glandS (15/16 vS. xxviii), form of typhloSole (lamelliform vS. Simple fold). The new SpecieS alSo differS from P. julkai and Ph. lamaganensis in ventral diStance between male poreS (0.35x circumference vS. 0.2–0.23x or 0.21– 0.22x), poSition of gizzard (viii–ix vS. viii), inteStinal origin (xv vS. xvi), typhloSole (lamelliform vS. abSent). Morphologically, the new SpecieS iS particularly Similar to Metaphire houlleti (Perrier, 1872) in body Shape, three pairS of Spermathecal poreS in interSegmentS 6/7/8/9, preSence of copulatory poucheS, Shape of Spermathecal ampulla and diverticulum, and preSence of aSSeSSory glandS in Spermathecal and male regionS (Perrier 1872). However, Pheretima vungtauensis sp. nov. iS diStinctly different from M. houlleti in having micronephridia on the Spermathecal ductS, and in the abSence of genital markingS in Spermathecal and male regionS. M. houlleti iS recogniSed by abSence of micronephridia on Spermathecal ductS, and preSence of Small genital markingS inSide Spermathecal and maleS poreS (Blakemore 2016). Molecular comparison. Due to theSe morphological SimilaritieS, the COI SequenceS from SpecimenS identified aS M. houlleti were included in the molecular analySiS. BaSed on COI SequenceS, the new SpecieS, Pheretima vungtauensis sp. nov., iS more cloSely related to M. houlleti than to other SpecieS of Pheretima; the holotype of the new SpecieS iS neSted within a clade formed by SpecimenS identified aS Metaphire houlleti (Fig. 2). It iS cloSely related to a Metaphire houlleti group from Thailand (II) with bootStrap and BI valueS of 88% and 1.00 BPP, reSpectively. However, the Kimura 2-parameter (K2P) diStance between the new SpecieS and Metaphire houlleti from Thailand (II) varieS from 0.148 to 0.2 (Table 2). ThiS diStance iS relatively cloSe to or higher than that for SpecieS delimination uSing COI barcodeS (0.15) aS diScuSSed in Chang & JameS (2011) and Jerathitikul et al. (2017). In addition, Metaphire houlleti nominal SpecieS iS branched into three cladeS, Vietnam + India + Philippine, Thailand (I) and Thailand (II). Each clade iS clearly different from otherS in genetic diStance (ranging from 0.175 to 0.222). Of theSe, two cladeS (Thailand I and II) are Separated with good Support of bootStrap and BI valueS of 70% and 0.99 BPP, reSpectively. BeSideS, Blakemore (2016) reportS on a 19% COI difference between two SpecimenS of M. houlleti, one from Thailand, the other one from the PhilippineS, indicating a "molecular SpecieS-group" (ibd.). Furthermore, Jeratthitikul et al. (2017) alSo Stated that M. houlleti nominal SpecieS containS Several new cryptic SpecieS. We agree that the nominal SpecieS M. houlleti needS to be reviSed baSed on SpecimenS collected from different regionS.Published as part of Nguyen, Tung T., Nguyen, Nam Q. & Nguyen, Anh D., 2018, First record of the earthworm genus Pheretima Kinberg, 1867 sensu stricto in Vietnam, with description of a new species (Annelida: Clitellata: Megascolecidae), pp. 251-258 in Zootaxa 4496 (1) on pages 252-257, DOI: 10.11646/zootaxa.4496.1.20, http://zenodo.org/record/144679
Identification of the pathogen causing root and stem rot disease among Asparagus (Asparagus officinalis L.) cultivated in Ninh Thuan province : Graduation Thesis for Biotechnology
No full text68 p.Identification of the pathogen causing root and stem rot disease among Asparagus (Asparagus officinalis L.) cultivated in Ninh Thuan province, identification of morphological characteristics of pathogens, identification of molecular characteristics of the ITS rRNA sequence of Pathogens, determination of the effects of temperature, pH on the growth and development of pathogens on asparagus under in-vitro conditions
Eumenes gibbosus Nguyen, sp. nov.
No full text<i>Eumenes gibbosus</i> Nguyen, sp. nov. <p>(Figs 1–6, 15)</p> <p> <b>Material examined</b>. HOLOTYPE, ♀, “ VIETNAM, Pa Co, Mai Chau, Hoa Binh, 1000 m, 23.VIII.2005, L.T.P. Nguyen & J. Kojima [IEBR]. PARATYPES: VIETNAM: [IEBR] 1 ♀, same data as holotype; Ha Giang: 1 ♀, Ma Le, Dong Van, 23°17'9"N 105°18'2"E, 29.XI.2014, LTP Nguyen, LX Truong, MP Nguyen & DD Nguyen; Yen Bai: 1 ♂, Van Chan, 21°36'10"N 107°30'32"E, DD Nguyen; [VNMN] Son La: 2 ♀, Co Ma, Thuan Chau, 2.VI.2009 & 4.VI.2009, PH Pham.</p> <p> <b>Description.</b> <i>Female</i>. Body length 10.5–11 mm (holotype: 10.5 mm); fore wing length 8.6–9.6 mm (holotype: 8.6 mm). Head in frontal view subcircular, 1.3 × as wide as high (Fig. 1). Distance from posterior ocelli to apical margin of vertex 0.9 × distance from posterior ocelli to inner eye margin. Gena much narrower than eye, in lateral view 0.4 × as wide as eye. Occipital carina complete, present clearly along entire length of gena. Inner eye margins strongly convergent ventrally; in frontal view 1.6 × as further apart from each other at vertex as clypeus. Clypeus in lateral view strongly convex at basal two-third, then straight to apical margin; in frontal view higher than wide, 1.1 × as high as wide (Fig. 1), with basal margin slightly convex medially and distinctly separated from antennal sockets; apical margin deeply emarginate medially, forming round tooth on each lateral side (Fig. 1); width of emargination about equal to 1/3 width of clypeus between inner eye margins. Mandible with prominent teeth, fourth tooth long and pointed apically. Antennal scape 3 × as long as its maximum width; F1 2 × as long as wide, F2–4 slightly longer than wide, F5–9 wider than long, F10 bullet-shaped, its length about equal to its basal width.</p> <p>Mesosoma longer than width in dorsal view. Pronotal carina slightly raised, reaching ventral corner of pronotum. Mesoscutum convex, slightly shorter than wide between tegulae; anterior margin broadly rounded. Disc of scutellum slightly convex. Metanotum angle, crenulated at edge before sloping down to apical margin. Propodeal groove distinct from base to apex, without fovea.</p> <p>T1 2.3 × as long as wide, in dorsal view abruptly widen from one-third near base, then parallel to near apical margin, and slightly constrict near apical margin (Fig. 3). T 2 in lateral view gibbous, constricted near apical margin, with base strongly swollen dorsally, base of T2 forms with sternum obtuse angle (Fig. 2), in dorso-posterial view pear shape, 1.2 × as long as wide, with transverse sulcus at middle near apical margin (Fig. 4); S 2 in lateral view slightly convex.</p> <p>Body covered with short, pale yellow setae except temple and mesosoma with longer setae. Clypeus with deep and sparse punctures at center, punctures at sides smaller, space between punctures usually larger than puncture diameter. Mandible with several shallow small punctures. Frons densely covered with deep large punctures, space between punctures raised to form reticulation. Vertex and gena with deep and well-defined punctures, interspaces between punctures smooth. Pronotum with coarse punctures, spaces between punctures narrow, strongly raised to form reticulation. Mesocutum densely and coarsely covered with flat-bottomed punctures, puncture near lateral margin with interspaces raised to form reticulation. Punctures on scutellum similar to those near lateral margin of mesoscutum, with some smooth areas in middle. Punctures on metanotum very coarse and dense. Mesepisternum with big and coarse punctures posterodorsally as in pronotum, barely punctured anteroventrally; border between posterodorsal and anteroventral parts indistinct. Metapleuron with week short striae at lateral of dorsal area, with sparse shallow punctures in ventral area. Propodeum with punctures on dorsal surface similar to those on pronotum, punctures on lateral parts smaller and shallower than in dorsal part. T1 covered with large and deep punctures, with interspace larger than puncture diameter at lateral parts, punctures on T2 smaller and denser than those on T1, sparser at lateral parts; punctures on T3–5 much smaller and weaker than those on T1–2; T6 with minute punctures; punctures on S2 small, shallow and sparse.</p> <p> <i>Color</i>. Black. An orange-yellow spot between antennae. The following parts orange: short line at vertex behind eye, band at basal margin of pronotum with irregular shape, transverse line on metanotum (anterior and posterior margin black), apical band on T1, T2 and S2 (band on T1 on apical, swollen and shiny, rim, anteriorly emarginated medially and laterally), spot on lateral side of T2 (absent in one female). Lateral margin of tegula, propodeal valvulae, outer side at base of fore and mid- tibia, spot on fore and mid- femora at apex, dark brown. Wings dark brown, slightly infuscate, veins dark brown.</p> <p> <i>Male</i>. Body length 10 mm; fore wing length 8.0 mm. Structure as in female, but differing as follows: Head in frontal view 1.2 × as wide as high (Fig.5). Distance from posterior ocelli to apical margin of the vertex slightly greater than the distance from posterior ocelli to inner eye margin. Inner eye margins in frontal view 2 × further apart from each other at vertex than at clypeus. Clypeus in frontal view 1.5 × as wide as high, apical margin deeply emarginate medially, forming sharp triagle tooth on each lateral side (Fig. x), width of emargination nearly 1/2 width of clypeus between inner eye margins (Fig. 5). Mandibular with four distinct teeth on inner side, basal tooth long and point apically. Antennal scape 3 × as long as its maximum width; F1 2.5 × as long as its maximum width, F2–5 longer than wide, F6–9 wider than long, F10 small, as long as wide, F11 slightly curve, slightly less than 2.5 × as long as its basal width (Fig. 6).</p> <p> <i>Color</i>. As in female, and F11 dark brown.</p> <p> <b>Distribution</b>. Vietnam: Ha Giang, Son La, Hoa Binh.</p> <p> <b>Remarks</b>. This species can be distinguished from <i>E. nigriscutatus</i> Zhau, Chen & Li, 2012, from China, <i>E. tosawae</i> Giordani Soika, 1941, and other <i>Eumenes</i> species by the combination of the following characters: metasomal segment 1 2.3 × as long as wide, metasomal segment 2 gibbous with the base of T2 forming with the sternum an obtuse angle but dorsal part not strongly swollen and the transverse sulcus not so deep as in <i>E. nigriscutatus</i> and <i>E. tosawae</i>, and the color pattern.</p> <p> <b>Etymology</b>. The specific name refers to the distinct gibbosity of T2.</p>Published as part of <i>Nguyen, Lien Thi Phuong, 2015, Potter wasps of the genus Eumenes Latreille, 1802 (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species and key to species, pp. 564-572 in Zootaxa 3974 (4)</i> on pages 565-567, DOI: 10.11646/zootaxa.3974.4.7, <a href="http://zenodo.org/record/231683">http://zenodo.org/record/231683</a>
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