Zethus tansoneus Nguyen & Carpenter

Lien Thi Phuong Nguyen & James M. Carpenter, 2016, Taxonomic review of the genus Zethus Fabricius (Hymenoptera: Vespidae: Eumeninae) from Vietnam with descriptions of four new species, Entomological Science 2016, pp. 1-9 : 6-7

Zethus tansoneus Nguyen & Carpenter , sp. nov

( Figs 24–28 )

Holotype, ♂, “ VIETNAM, Tan Son, Mai Chau , Hoa Binh , 1000 m, 14.vi.2008, LTP Nguyen ” [ IEBR]. Paratype: VIETNAM: Quang Nam: 1♂, Phuoc My , Phuoc Son , 450 m a.s.l., 2.v.2005, Insect Systematic Department ’ s collectors [ IEBR].

Description

Male. Holotype. Body length 11.5 mm; forewing length 10 mm. Structure similar to Z. tumidus sp. nov. but differs as follows: frontal ocelli smaller with diameter 0.7× as wide as antennal socket diameter ( Fig. 24 ). Gena with a longitudinal medial carina running from base to near half the length of the gena. FI proportionally shorter, 1.7× as long as its maximum width, FII longer than wide, FII as long as wide, FIV – IX wider than long, FXI elongate, thinner, proportionally longer, 2.8× as long as it basal width ( Fig. 25 ). Mesoscutum and scutellum in lateral view less convex than in Z. tumidus , almost at same level. Metanotum not projected over propodeum. Medial concave area of propodeum without oblique striae, with some short transverse striae near base ( Fig. 26 ). Metasoma in dorsal ( Fig. 27 ) and lateral view ( Fig. 28 ) as in Z. tumidus .

Distribution. Vietnam: Hoa Binh.

Etymology. The specific name refers to the type locality, Tan Son in Mai Chau, Hoa Binh province of Vietnam.

Figures

Figures 24 – 28 Zethus tansoneus sp. nov., holotype ♂. 24 Head, frontal view. 25 Right antenna. 26 Propodeum, dorsal view. 27 TI & II in dorsal view. 28 Metasomal segments I & II, lateral view. Scale bar, 1 mm.