Coeleumenes flavus Nguyen

Nguyen, Lien Thi Phuong, 2016, Contribution to the taxonomy of the genus Coeleumenes van der Vecht, 1963 (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species, Zootaxa 4121 (2), pp. 175-180 : 178

Coeleumenes flavus Nguyen , sp. nov.

( Figs 8–13 )

Material examined. Holotype, ♀ [ IEBR], “ VIETNAM, Son La, Phu Yen, Gia Phu, Vo Nguyen Giap forest, 21°13'07.9"N, 104°32'39.7"E, 350 m, 18.vi.2015, Dac Dai Nguyen”. Paratype: VIETNAM: [ IEBR]: Kon Tum: 1♀, Chu Mom Ray, Sa Son, Sa Thay, 19°47’24.5"N, 104°59’46.5”E, ca. 730m, 25.IV.2016, LTP Nguyen et al.

Diagnosis. Female. The new species can be distinguished from all other congeners by the following combination of characteristics: body with well defined medium punctures, border between punctures smooth, not reticulated; T 1 in dorsal view tuberculate laterally at midpoint; T2 with apical lamella strongly raised; S1 with weak transverse striate, apical part with some small punctures and without striae; and color pattern. Male. Unknown.

Description. Female. Holotype. Body length 13–13.5 mm (holotype: 13 mm); fore wing length 11–11.5 mm (holotype: 11 mm). Structure as in Coeleumenes burmanicus but differs as follows. Head in frontal view slightly wider than its height ( Fig. 8 ). Vertex with deeper depression for cephalic foveae, foveae located inside clearly defined V-shaped edge ( Fig. 9 ). Mesoscutum shorter than its width between tegulae, about 0.9 × as long as wide ( Fig. 10 ). Body with well defined medium punctures, which much weaker than those in C. burmanicus , border between punctures at frons, pronotum, mesoscutum, scutellum and mesepisternum smooth, not reticulated; posterior face of propodeum with punctures well defined, not rugose; median carina running from one third at base of groove to apical margin; T1 about 2 × as wide as long ( Fig. 11 ); T2 slightly wider than its length ( Fig. 12 ); S 2 in lateral view less angular ( Fig. 13 ).

Color. Black and shining; following parts yellow: clypeus except margins, basal spot on mandible, large spot between antennae which connect to clypeus, thick band along inner eye margin and running to posterior ocelli, thick band at vertex behind eye, frontal part of scape, thick band along pronotal carina at dorsal part of pronotum (narrowly broken medially), two long parallel longitudinal lines in median part and two shorter lines at lateral margins of mesoscutum, two spots at lateral margin of scutellum, two bands on metanotum (occupying almost whole metanotum), apical half of posterior face of propodeum, tegula except black spot in the middle, pretegular carina, band at apical margin of T1 which extends laterally, thick band at apical margin of T2 deeply emarginated medially, narrow apical band of T3 with small incision on each side, rectangle and square apical marks of T3–T4 medially; narrow lateral apical stripe of S1, and lateral spot at corner of S2. Legs black, apical half of fore femur, nearly all part of fore tibia, apical spot of middle and hind tibia yellow, apical spot of middle and fore femur reddish-brown.

Male. Unknown.

Distribution. Vietnam: Son La, Kon Tum.

Etymology. The specific name refers to the extensive yellow markings in this species.

Remarks. The color pattern of this species is very similar to that of Coeleumenes impavidus ( Bingham, 1897) , but the morphological characteristics are different as follows: punctures on metasoma sparser and shallower than punctures on head and mesosoma (punctures on metasoma somewhat deeper and denser than punctures on head and mesosoma in C. impavidus ) and clypeus with apical margin deeply emarginated (slightly emarginated in C. impavidus ); T 1 in dorsal view laterally tuberculate at midpoint ( Fig. 11 ) [straight in C. impavidus according to Giordani Soika (1941)].

Figures

FIGURES 8 – 13. Coeleumenes flavus sp. nov., holotype, ♀. 8. Head, frontal view, 9. Vertex, dorsal view, 10. Mesosoma, dorsal view, 11. T 1, dorsal view, 12. T 2 – T 6, dorsal view, 13. Metasoma, lateral view.