Coeleumenes burmanicus ( Bingham, 1897 )

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 : 175-178

Coeleumenes burmanicus ( Bingham, 1897)

( Figs 1–7 )

Montezumia burmanica Bingham, 1897: 350 , fig. 101, ♀, ♂, “Tenasserim” (The Natural History Museum, London, type no. 18.212a).

Montezumia bisulcata Cameron, 1900: 535 , ♀, “Khasia Hills, Assam” (Oxford University Museum, Oxford). Montezumia burmanica var. malayana Dover, 1931: 253 , ♀, “Jor Camp, Perak, Malaya ” (? The Natural History Museum, London). Synonymized by van der Vecht 1963: 46

Coeleumenes burmanicus: van der Vecht, 1963: 46 , [Sikkim; Assam; Indo-China; Siam; Malaya; Vietnam (Than Moi)]; Nguyen et al. 2014: 9 ( Vietnam: Bac Kan, Hoa Binh, Gia Lai)

Material examined. VIETNAM [ IEBR]: Tuyen Quang: 1 ♀, Na Hang natural rreserve, Na Hang, Son Phu ranger station, 22°21.2'07"N 105°25'34.7"E, 264 m, LTP Nguyen, DD Nguyen & LX Truong, 9.vi.2015; Bac Kan: 1 ♀, Kim Hy NP, Vu Muon, Bach Thong, 22°12'51"N 105°58'42"E, 5.viii.2012, J Kojima, H Nugroho & IED-c; Lang Son: Cai Kinh, Huu Lung, 21°51'42"N 106°43'54"E [1 ♀, 2.xi.2014, LTP Nguyen, DD Nguyen & MP Nguyen; 1 ♀, 1 ♂, 24.xi.2015, LTP Nguyen, DD Nguyen & NT Tran]; Hoa Binh: 1 ♀, Da Phuc, Yen Thuy, 3.v.2002, TV Hoang; Ha Tinh: 1 ♀, Khe Van, Son Hong, Huong Son, 120-180 m, 24.iv.2004, LX Truong.

Redescription. Female (n=6). Body length 13.0–15.0 mm; fore wing length 11.5–13.5 mm. Head in frontal view subcircular, 1.2 × as wide as high ( Fig. 1 ). Vertex with small cephalic foveae, with some pubescence, located close to each other, with distance between them about one-half distance between posterior ocelli; with shallow depression for cephalic foveae, which located inside faint V-shaped edge ( Fig. 2 ). Distance from posterior ocelli to apical margin of vertex 2.2 × distance from posterior ocelli to inner eye margin ( Fig. 2 ). Gena in lateral view 0.5 × as wide as eye. Occipital carina developed only laterally. Inner eye margin slightly convergent ventrally, in frontal view slightly further apart from each other at vertex than at clypeus. Clypeus in lateral view gradually convex from base to basal half, then nearly straight to apical margin, in frontal view 1.2 × as high as wide ( Fig. 1 ), with basal margin close to antennal sockets, apical margin deeply emarginated medially, forming sharp tooth on each lateral side, width of emargination about 1/3 width of clypeus between inner eye margins. Mandible with four prominent teeth, fourth tooth long and blunt apically. Scape more than 4 × as long as its maximum width; F1 2.3 × as long as wide, F2–5 longer than its width, F6 as long as wide, F7–9 wider than its length, terminal flagellomere bulletshaped, as long as wide.

Mesosoma dorsally longer than its width. Pronotal carina slightly raised, reaching ventral corner of pronotum. Mesoscutum weakly convex, shorter than its width between tegulae, about 0.9 × as long as wide; anterior margin broadly rounded. Disc of scutellum slightly convex, in profile at same level as mesoscutum. Metanotum flat. Propodeum without shelf, posterior surface not concave, with deep median groove ( Fig. 3, 5 ), border between posterior and lateral surfaces angled.

Metasomal segment 1 subpetiolate, shorter than segment 2. T1 dorsally 1.5 × as long as wide, with node at lateral half ( Fig. 3 ); T2 as wide as long ( Fig. 3 ), with apical lamella short and slightly raised; S 2 in lateral view flat in basal half, angled and straight to apical margin ( Fig. 4 ).

Body with short, silver setae except front, posterior part of head, lower part of propodeum, mesepisternum and S1 with long silver setae. Clypeus with large and deep punctures, border between punctures with small punctures, clypeus almost flat in middle of apical half, with sparse punctures and irregular striae. Mandible with several shallow small punctures. Frons with dense shallow large flat-bottomed punctures, vertex and gena with smaller and more clearly defined punctures. Pronotum with coarse punctures, spaces between them narrow, strongly raised, forming reticulation. Mesocutum with dense and coarse flat-bottomed punctures, punctures on anterior half similar to those on pronotum, posterior half with some smooth areas near apical margin and tegulae. Sculellum with punctures similar to those on pronotum, with median longitudinal faint carina on basal half, area along carina to apical margin smooth. Metanotum with punctures very coarse, with median longitudinal smooth area. Tegula sparsely punctate at base, remainder micropunctate. Mesepisternum with epicnemial carina, with bigger and coarser punctures posterodorsally than on pronotum, reticulated, barely punctured anteroventrally; border between posterodorsal and anteroventral parts distinct. Metapleuron almost smooth. Propodeum with posterior face irregularly rugose, lateral parts dull, with some punctures and transversely striate. T1 with deep, dense well defined punctures, T2 with sparser and shallower punctures than in T1, area between punctures smooth, punctures on T3– T4 much smaller and weaker than those on T1–T2, T5–T6 with minute punctures; punctures on S2 uniform and slightly deeper than those on T2, S1 with strong transverse striae throughout sternum, with narrow basal part smooth, punctures on S3–S5 small and deep.

Color. Black with some yellow markings as follows: spot at base of mandible, narrow short band along inner eye margin near clypeus, three small spots between antennal sockets (nearly united in two specimens), antennal scape beneath, narrow short band at vertex behind eye (sometimes absent), two narrow short bands along pronotal carina on dorsal part of pronotum, narrow band at apical margin of T1 (interrupted medially) extended to lateral sides with faint small spot above yellow part laterally, three short narrow bands at apical margin of T2, stripe on outer side of protibia. Propodeal valvulae and apical margin reddish-brown. Wings dark brown, strongly infuscate, veins dark brown.

Male (n=1). Body length 10.5 mm; fore wing length 9.5 mm. Structures as in female, except follows: Area around occelli slightly swollen. Vertex without cephalic fovea. Distance from posterior ocelli to apical margin of vertex slightly more than 4 × distance from posterior ocelli to inner eye margin. Inner eye margins in frontal view 1.3 × further apart from each other at vertex than at clypeus. Clypeus in frontal view 1.1 × as high as wide, apical margin deeply emarginated medially, forming sharp triangle tooth on each lateral side ( Fig. 7 ), width of emargination nearly 1/2 width of clypeus between inner eye margins ( Fig. 7 ). Mandible with four distinct teeth, first tooth with inner side sharply emarginated medially, forming two small triangle shape on each side of the tooth. Scape 3 × as long as its maximum width; F1 2 × as long as its maximum width, F2–9 longer than its width, F10 small, as long as wide, F11 slightly curve, slightly less than 2.5 × as long as its basal width ( Fig. 7 ).

Color. As in female, and longitudinal wide medial band of clypeus, spot at apical margin of femur and short strip at outer side of middle tibia yellow, mark on lateral margin of tegula brown; yellow band at apical margin of T1 absent.

Remarks. Symbiotic associations with mites were observed in four of seven specimens of this species. The mites usually occupy the posterior face of propodeum ( Fig. 5 ), sometimes at holes near metanotum and around the basal slit of the metasomal segment. This phenomenon is also reported by Kumar & Carpenter (2013), in potter wasp species of the genus Antodynerus de Saussure, 1855 . According to Okabe and Makino (2003), the mites of the family Winterschmidtiidae (Acari) are known to be symbiotic with potter wasps.

Distribution. India; Myanmar; Thailand; Laos; Vietnam; Malaysia.

Figures

FIGURES 1 – 7. Coeleumenes burmanicus. 1 – 5, ♀. 1. Head, frontal view, 2. Vertex, dorsal view, 3. Propodeum and metasoma, dorsal view, 4. Metasoma, lateral view, 5. Propodeum with mites, ♂ 6 – 7, ♂. 6. Head, frontal view, 7. Left antenna.