Chalogaster, CARPENTER & STARR, 2000

CARPENTER, JAMES M. & STARR, CHRISTOPHER K., 2000, A New Genus of Hover Wasps from Southeast Asia (Hymenoptera: Vespidae; Stenogastrinae), American Museum Novitates 3291 (1), pp. 1-12 : 3

Chalogaster , new genus

Figures 1–7

TYPE SPECIES: Chalogaster spatulata , new species.

DESCRIPTION: Occipital carina fused with hypostomal carina (fig. 1); vertex without median longitudinal groove; eyes exceptionally large, about 85% as long as entire head and occupying almost all of side view of head, only very narrowly separated from clypeus; maxillary palpi with the length of segment 2 approximately equal to that of segment 3; labial palpi with first segment subequal in length to combined lengths of segments 2–4; scutum with notauli strongly impressed (fig. 4), cuticle shining; propodeum smooth, with valvulae reduced posteriorly, without raised lamella above orifice; hindwings with posterior fringe of hairs very short; metasomal segment II not petiolate basally (fig. 5), spiracles not visible in dorsal view (fig. 5). Female with scutellum carinate medially. Male with terminal antennal flagellomere spatulate (figs. 2–3), flagellomeres not flattened (fig. 2); clypeus rounded apically; mandibles bidentate, teeth sharp; without sunken metapleura; foretibiae lacking spatulate setae; foretarsomeres not ventrally produced into spines; apical midtarsomeres symmetrical, flattened and expanded (fig. 6), distitarsi rounded (fig. 6); hindwings without pigmented area posterobasally; metasomal Sternum VII flattened; parameral spines not dilated (fig. 7A), with median inner processes (fig. 7B), bent in towards each other near the base, then arching out apart; cuspis + lamina volsellaris broad medially (fig. 1C), aedeagus apically strongly compressed (fig. 7D), apex dilated in lateral view (fig. 7E), with pair of small projections located laterobasally (fig. 7D–E), none subapically.

DISTRIBUTION: Viet Nam and Thailand.

ETYMOLOGY: The name combines the root used in all other genera in the subfamily Stenogastrinae with the type locality.

Figures

Fig. 1. Chalogaster spatulata, n. sp., male paratype. Head in ventral view.

Fig. 2. Chalogaster spatulata, n. sp., male paratype. Head and antennae in lateral view.

Fig. 3. Chalogaster spatulata, n. sp., male paratype. Terminal antennal flagellomere.

Fig. 4. Chalogaster spatulata, n. sp., male paratype. Scutum in oblique dorsal view.

Fig. 5. Chalogaster spatulata, n. sp., male paratype. Metasomal segments I and II in dorsal view.

Fig. 6. Chalogaster spatulata, n. sp., male paratype. Midtarsus.

Fig. 7. Chalogaster spatulata, n. sp., male paratype. Genitalia. A, lateral view. B, ventral view. C, paramere and volsella in interior lateral view. D, aedeagus in ventral view. E, aedeagus in lateral view. The scale bar is 1 mm.