Key to species of the genus Centistoides

1. First medial abscissa (1-SR+M) of fore wing sinuate; second medial abscissa (2-SR+M) long, 0.6 × as long as recurrent vein (Fig. 31). Discoidal (first discal) cell anteriorly narrowly sessile (Fig. 31). First transverse anal vein (1a) present (Fig. 3 1). Propodeum with distinct basomedian carina and with areola completely delineated by carinae (Figs 30, 32). Prescutellar depression (scutellar sulcus) distinctly sculptured (Fig. 30). Ovipositor sheath thick, but flattened on narrow flanges dorsally and apically, densely setose subapically (Fig. 33). Fore wing length 4.7 mm. Afrotropical region (Madagascar)................................................................. C. ophthalmicus (Granger, 1949), comb. nov. (Figs 22–33)

- First medial abscissa (1-SR+M) of fore wing straight; second medial abscissa (2-SR+M) short, about 0.3 × as long as recurrent vein (Fig. 41). Discoidal (first discal) cell anteriorly broadly sessile (Fig. 41). First transverse anal vein (1a) absent (Fig. 41). Propodeum without basomedian carina, with areola incompletely delineated by carinae (Figs 39, 43). Prescutellar depression (scutellar sulcus) smooth (Fig. 39). Ovipositor sheath entirely flatted, truncate and glabrous apically (Figs 42, 44). Fore wing length 3.0 mm. Neotropical region (Suriname)............................ C. doesburgi Achterberg, 1992 (Figs 34–44)

Remarks. This is a second species of the formerly monotypic Neotropical genus Centistoides van Achterberg, 1992 (van Achterberg, 1992). Granger (1949) originally described this species in Centistes Haliday, 1835 because it is superficially similar to that genus. However, the discussed Malagasy species has many peculiar characters, such as entirely sclerotised and pigmented mediocubital vein (M+CU) of the fore wing, discoidal (first discal) cell anteriorly sessile, strongly reduced segments of maxillary and labial palpi, malar suture almost absent, hypopygium enlarged and medially deep incised, ovipositor sabre-shaped and strongly curved. These features are unknown in many cases in members of the genus Centistes, but their presence as a suite characterises the genus Centistoides .