Exothecinae Haliday

Singh, Longjam Roni Kumar, Achterberg, C. Van & Sheela, S., 2022, Studies on the subfamily Exothecinae (Hymenoptera: Braconidae) with the description of a new genus and a new species from India, Zootaxa 5133 (1), pp. 40-52 : 41-42

A. Key to the extant genera of the subfamily Exothecinae Haliday

(modified from Belokobylskij, 1984, 1994b, 2000; van Achterberg, 1983)

1. Prepectal carina present in front of precoxal sulcus; occipital carina complete dorsally and area in front of it rugulose; frons with crenulate median groove; precoxal sulcus very wide............................ Orientocolastes Belokobylskij, 1999

- Prepectal carina completely absent ( Fig. 2F ); occipital carina usually absent dorsally, if present then area in front of it smooth ( Figs 3A , 4C ); frons without crenulate median groove; precoxal sulcus absent or narrow ( Fig. 2F ); but distinctly developed in Colastes ( Discolastes Belokobylskij, 2000 )................................................................ 2

2. Pronope absent or small, shallow and transverse, rarely medium-sized; clypeus convex............................. 3

- Pronope present, large and deep ( Fig. 3F ); sometimes obsolescent in Xenarcha ; clypeus flattened..................... 4

3. Metasomal tergite V markedly enlarged, bent posteriorly and concealing subsequent tergites; tergites I–V entirely sculptured; male without occipital carina, but large temporal tubercles developed; malar suture distinct.................................................................................................... Vietcolastes Belokobylskij, 1994

- Metasomal tergite V normal; tergites II–V either smooth or sculptured; in both sexes occipital carina developed and temporal tubercles absent; malar suture indistinct or obsolescent..................................... Colastes Haliday, 1833

4. Tergites I–III forming a carapace-like metasoma, coarsely longitudinally striate, and their epipleura less sclerotised than their nota; remaining tergites covered by tergites I-III or largely so; tergite III on posterior margin with more or less distinct transparent border........................................................... Colastinus Belokobylskij, 1984

- Tergites I–III not forming a carapace-like metasoma, with their epipleura and nota equally sclerotised; remaining tergites distinctly exposed, tergite III along posterior margin without transparent border................................... 5

5. Occipital carina complete, ventrally reaching up to base of mandible ( Figs 3A , 4C , 6A–E ); first subdiscal cell of fore wing elongate ( Figs 5B, 5D ); fore wing vein 1-M of male widened, as wide as or wider than the length of vein cu-a ( Fig. 5D )...................................................................................... Occipitotus gen. nov.

- Occipital carina incomplete, dorsally interrupted; first subdiscal cell of fore wing broad; fore wing vein slender.......... 6

6. Metasomal tergites I–V entirely sculptured; apical tergites not protruding (or only slightly) beyond tergite V; tergites IV and V with a lateral crease.................................................... Pseudophanomeris Belokobylskij, 1984

- Metasomal tergites less sculptured, at most tergite III completely and base of tergite IV sculptured; apical tergites distinctly protruding beyond tergite V; tergites IV and V without a lateral crease........................................... 7

7. Posterior half of notauli absent or obsolescent; vein r of fore wing usually departing between basal third and base of pterostigma; if departing near basal 0.4 of pterostigma, then vein m-cu of fore wing distinctly converging to vein 1-M posteriorly................................................................................. Shawiana van Achterberg, 1983

- Posterior half of notauli distinctly impressed, (nearly) complete; vein r of fore wing departing from basal 0.4–0.6 of pterostigma and vein m-cu of fore wing less converging posteriorly.................................... Xenarcha Foerster, 1863

Figures

FIGURES 2(A–F). Occipitotus langpramensis sp. nov., holotype, female. (A) Head, lateral view; (B) habitus, lateral view; (C) apex of antenna; (D) base of antenna; (E) head, frontal view; (F) mesosoma, lateral view. Scale bars = 0.2 mm (A, C, D, E, F); 0.5 mm (B).

FIGURES 3(A–G). (A–E) Occipitotus langpramensis sp. nov., holotype, female. (A) Head, dorsal view; (B) mesosoma, dorsal view; (C) metasoma, dorsal view; (D) apex of metasoma, showing ovipositor sheath and ovipositor; (E) ovipositor; (F–G) paratype, female. (F) Pronotum, dorsal view, showing pronope; (G) propodeum + metasomal tergite I, dorsal view. Scale bars = 0.2 mm (A, B, C, D, F, G); 0.1 mm (E).

FIGURES 4(A–D). (A) Occipitotus langpramensis sp. nov., paratype, female, metasoma, dorsal view; (B–D), paratype, male; (B) habitus, lateral view; (C) head + pronotum, dorsal view, showing pronope; (D) mesosoma, dorsal view. Scale bars = 0.2 mm (A, C, D); 0.5 mm (B).

FIGURES 5(A–D). (A, D) Occipitotus langpramensis sp. nov., paratype, male. (A) Metasoma, dorsal view; (D) fore wing; (B–C) paratype, female. (B) fore wing; (C) hind wing. Scale bars = 0.2 mm (A); 0.5 mm (B, C, D).

FIGURES 6(A–E). Occipitotus langpramensis sp. nov., head, latero-posterior view. (A) Holotype, female; (B–E) paratypes. (B–D) females; (E) male. Scale bars = 0.2 mm.