Anterhynchium (Anterhynchium) punctatum Nguyen

Nguyen, Lien Thi Phuong, 2015, Taxonomic notes on the species of the genus Anterhynchium de Saussure, 1863 (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species, Zootaxa 3915 (1), pp. 132-138 : 133-136

Anterhynchium (Anterhynchium) punctatum Nguyen , sp. nov.

( Figs 1–7, 9 )

Anterhynchium abdominale abdominale ( Illiger, 1802) : Nguyen et al. 2014: 8, misidentification.

Material examined. HOLOTYPE, ♀, pinned (deposited in IEBR), “ VIETNAM, Lac village, Chieng Chau, Mai Chau, Hoa Binh, 600 m, 10.VI.2008, L.T.P. Nguyen. PARATYPES ( IEBR): VIETNAM: Son La: 1 ♂, To Hieu, 7.X.2000, X.L. Truong; Vinh Phuc: 1 ♀, Ngoc Thanh, Me Linh, 12.IX.2014, H.T. Dang; Bac Giang: 1 ♂, Khe Ro Natural Reserve, An Lac, Son Dong, 5.VI.2014, L.T.P. Nguyen et al; 1 ♂, Da Phuc, Yen Thuy, 27.VII.2000, X.L. Truong; 1 ♂, Cuc Phuong NP, 8.V.2002, V.T. Hoang; Dak Lak: 3 ♂, Yok Don NP, Buon Don, 12°52'19"N 107°48'25"E, 190 m, 9.VI.2013, L.T.P. Nguyen.

Description. Female. Body length 16.3–16.5 mm (holotype: 16.3 mm); fore wing length 15.8–16 mm (holotype: 15.8 mm). Head in frontal view subcircular, about 1.1 × as wide as high ( Fig. 1 ). Vertex with cephalic foveae small, bearing dense pubescence, situated close to each other with distance between foveae slightly less than one-third distance between posterior ocelli; depression for cephalic foveae conspicuous ( Fig. 2 ). Distance from posterior ocelli to apical margin of vertex about 2.5 × distance from posterior ocelli to inner eye margin ( Fig. 2 ). Gena much narrower than eye, in lateral view about 0.7 × as wide as eye. Occipital carina complete, present along entire length of gena, but dorsally weak. Inner eye margins strongly convergent ventrally; in frontal view about as further apart from each other at vertex as clypeus. Clypeus in lateral view weakly convex at basal half, then straight to apical margin; in frontal view about as wide as high ( Fig. 1 ), with basal margin slightly convex medially and distinctly separated from antennal sockets; apical margin shallowly emarginate medially, forming blunt tooth on each lateral side ( Fig. 1 ); width of emargination slightly greater 1/3 width of clypeus between inner eye margins. Mandible with prominent teeth, fourth tooth long and pointed apically. Antennal scape about 3.4 × as long as its maximum width; flagellomere I about 2 × as long as wide, flagellomeres II–IV slightly longer than wide, V–IX as wide as long, terminal flagellomere bullet-shaped, slightly longer than its basal width.

Mesosoma longer than wide in dorsal view. Pronotal carina slightly raised, produced as humeral angles, reaching ventral corner of pronotum. Mesoscutum weakly convex, 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. Propodeum excavated medially, basal triangular area without basal fovea, at lower end of the area median carina runs to apical margin, upper part of propodeum normal, not produced ( Fig. 3 ); dorsal surface smoothly connected to posterior surface; border between posterior and lateral surfaces angle.

Metasomal tergum I as wide as tergum II, round at base ( Fig. 4 ); anterior vertical surface of tergum I weakly convex, with some shallow punctures. Tergum I and II in dorsal view about 1.5 × as wide as long ( Fig. 4 ); sternum II truncated at anterior margin, then depress in the middle to apical margin.

Body covered with short, ferruginous hairs except temple and lower part of propodeum with longer hairs. Clypeus with shallow ill-defined large punctures at the center, punctures at sides smaller. Mandible with several shallow small punctures. Frons densely covered with shallow large punctures. Vertex and gena with deep and welldefined punctures, interspaces between punctures smooth. Pronotum with coarse punctures, spaces between punctures narrow, strongly raised to form reticulation. Mesocutum densely and coarsely covered with flatbottomed punctures, puncture near lateral margin with interspaces raised to form reticulation. Punctures on scutellum similar to those near lateral margin of mesoscutum. Punctures on metanotum very coarse and dense. Mesepisternum with bigger and coarse punctures posterodorsally than in pronotum, barely punctured anteroventrally; border between posterodorsal and anteroventral parts distinct. Metapleuron with week short striae at lateral and small punctures at upper parts of dorsal area, with sparse shallow punctures in ventral area. Propodeum with punctures on dorsal surface similar to those on mesopleuron, punctures on lateral parts smaller and shallower than in dorsal part, posterior surface shiny, with oblique long striae carinae on almost all the surface, upper part of inferior ridges irregularly spinose. Metasomal terga I–II covered with small and deep punctures, with interspace larger than puncture diameter, punctures near apical margin of tergum II much deeper, larger and coarser than those on other part of the tergum, punctures on terga III–V much smaller and weaker than those on terga I–II, punctures near apical margin of terga III–V also deeper, larger and coarser than those on other parts of the terga; tergum VI with minute punctures; punctures on sternum II uniform and slightly deeper and larger than those on tergum II, narrow basal part of metasomal sternite I smooth.

Color. Black except metasomal segment II–VI reddish-brown. Propodeal valvulae dark brown. Wings dark brown, slightly infuscate, veins dark brown.

Male. Body length about 12–14 mm; forewing length about 11.5–13.5 mm. Structure as in female, but differing as follows: Head in frontal view about 1.3 × as wide as high ( Fig.5 ). Vertex without cephalic fovea, area from posterior ocelli to apical margin of the vertex strongly swollen. Distance from posterior ocelli to apical margin of the vertex about 2.8 × of the distance from posterior ocelli to inner eye margin. Inner eye margins in frontal view about 1.2 × further apart from each other at vertex than at clypeus. Clypeus in frontal view about 1.1 × as wide as high, apical margin deeply emarginate medially, forming a sharp triagle tooth on each lateral side ( Fig. 5 ), width of the emargination nearly 1/2 width of clypeus between inner eye margins ( Fig.5 ). Mandibular with two distinct teeth on inner side, the basal tooth thick, shallowly excavated at inner margin, the other tooth short and point apically ( Fig.7 ). Antennal scape about 2.6 × as long as its maximum width; flagellomere I about 2 × as long as its maximum width, flagellomere II–IX longer than wide, flagellomere X small, as long as wide, terminal flagellomere slightly curve, slightly more than 2.5 times as long as its basal width ( Fig. 6 ).

Color. Black; following parts yellow: a round large spot on clypeus, two spots on frons just above antennal sockets, close to each other. Antenna dark brown. Metasomal segment II–VII reddish-brown.

Distribution. Vietnam: Son La, Bac Giang, Vinh Phuc, Hoa Binh, Ninh Binh, Dac Lak.

Remarks. This species is very similar to A. mellyi in the subgenus Anterhynchium but can be distinguished by the following combination of characters: metasomal segments reddish-brown except the first segment (metasomal segments all black in A. mellyi ); punctures on metasomal segment coarser, clypeus of male wider than high, about 1.2 times as wide as high (as wide as high in A. mellyi ); mandibles of male more shallowly emarginate on inner side near the middle.

Etymology. The specific name refers to the distinct punctures of the body.

Figures

FIGURES 1 – 6. Anterhynchium punctatum sp. nov., 1 – 4: holotype, ♀. 1. Head, frontal view. 2. Vertex, dorsal view. 3. Metanotum and propodeum, dorsal view. 4. Mesosoma, lateral view. 5 – 6: ♂. 5. Head, frontal view. 6. Right antenna.

FIGURES 7 – 12. Anterhynchium species. 7, 9. A. punctatum, sp. nov., ♂. 7. Mandible, frontal view. 9. Habitus. 8, 12. A. mellyi (de Saussure), ♂. 8. Mandible, frontal view. 12. Habitus. 10. A. flavolineatum flavolineatum (Smith), ♀, habitus. 11. A. flavomarginatum flavomarginatum (Smith), ♂, habitus.