Key to world species of subgenus Contochorus van Achterberg

1 Posterior half of notauli absent (Figs 2D, 6D); antennomeres of ♀ 16; length of eye of ♀ in dorsal view 0.8 × length of temple.............................................................................................. 2

- Posterior half of notauli complete (Figs 4D, 8D); antennomeres of ♀ 17–23; length of eye of ♀ in dorsal view 1.1–2.1 × length of temple............................................................................................ 3

2 Vein r of fore wing much shorter than maximum width of pterostigma (Fig. 6I); third antennomere yellow; head longitudinal and flat in dorsal view, width of head in dorsal view 1.1 × its length; notauli present anteriorly; vein 2-CU1 of fore wing 3 × longer than vein 1-CU1 (Fig. 6I); second tergite smooth...................................... B. (C.) planus sp. nov.

- Vein r of fore wing about as long as maximum width of pterostigma (Fig. 2H); third antennomere dark brown; width of head in dorsal view 1.4 × its length; notauli absent anteriorly; vein 2-CU1 of fore wing 1.6 × longer than vein 1-CU1 (Fig. 2H); second tergite rugose.................................................................... B. (C.) capillosus sp. nov.

3 Antennomeres of ♀ 17; notauli anteriorly smooth, without transverse carinae; middle claw of ♀ with blackish bristles; medial area of propodeum quadrangular, its height subequal to its width; width of head in dorsal view 1.4 × its length; lateral carina of scutellum slightly protruding apically........................................ B. (C.) glaber van Achterberg, 1976

- Antennomeres of ♀ 21–23; notauli with two transverse carinae anteriorly; middle claw of ♀ without blackish bristles; medial area of propodeum rectangular somewhat longer than wide; head transverse and flat in dorsal view, width of head in dorsal view 1.6–1.8 × its length; lateral carina of scutellum strongly protruding apically....................................... 4

4 First discal cell of fore wing widely truncate anteriorly; length of eye of ♀ in dorsal view 1.3–1.6 × length of temple; notauli comparatively narrow (Fig. 8D); area behind prepectal carina less conspicuously crenulate..... B. (C.) turbidus Papp, 1985

- First discal cell of fore wing narrowly truncate anteriorly; length of eye of ♀ in dorsal view 1.7–2.1 × length of temple; notauli comparatively wide (Fig. 4D); conspicuously crenulate behind prepectal carina.................................... 5

5 Vein M+CU of hind wing shorter than vein 1-M; notauli widened anteriorly; eye of ♀ in dorsal view 2.0–2.1 × length of temple; hind tarsus of ♀ somewhat shorter than hind tibia; tarsi (pale) brownish-yellow....................................................................................................... B. (C.) mellitarsis van Achterberg, 1988

- Vein M+CU of hind wing subequal to vein 1-M; notauli evenly wide anteriorly and posteriorly; eye of ♀ in dorsal view approx. 1.7 × length of temple; hind tarsus of ♀ as long as hind tibia; tarsi whitish-yellow...................................................................................................... B. (C.) epomidus van Achterberg, 1988