Species Ischnoptera deropeltiformis - Dark Wood Cockroach

deropeltiformis = 'having the form of Deropeltis' (original description mentions a resemblance the female has to Deropeltis erythrocephala)

Male- Subgenital plate subsymmetrical, with a broad convex lobe bearing 2 cylindrical dissimilar styles, the right one stouter, interstylar margin about the same as the length of a style. Genitalia: hook on the left side with a preapical incision; median phallomere terminating in a dark spinelike process with subobsolete barbules at its base (seen under compound microscope) and a large lobe which may be membranous or dark; right phallomere consisting of about 4 sclerites, one a small cleft, setal sclerite absent.

Female- Pronotum parabolic. Tegmina reduced in length, reaching to the first abdominal tergum (Fig. IE), distal margin subtruncate, sutural margins contiguous. Abdominal terga unspecialized; supra-anal plate trigonal, apex rounded; subgenital plate with oblique sides and truncate hind margin extending beyond the margins of the supra-anal plate.