Eumenes congnatus Nguyen

Nguyen, Lien Thi Phuong, 2016, Two new species of the genus Eumenes Latreille, 1802 (Hymenoptera: Vespidae, Eumeninae) from Vietnam, Zootaxa 4093 (4), pp. 583-588 : 585-587

Eumenes 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 T1. 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 ). F11 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 T1 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).

Figures

FIGURES 7 – 12. Eumenes congnatus sp. nov., 7 – 9: holotype, ♀. 7. Head, frontal view. 8. Metasomal segments 1 - 2, lateral view. 9. T 1, dorsal view. 10 – 12: ♂. 10. Head, frontal view. 11. Right antenna. 12. Habitus.