Theretra alecto
Immediately recognizable from all other Theretra by the red hindwing upperside with a black base and the lack of a strong dorsal pale line along the thorax and abdomen. Specimens from more arid and desert habitats tend to be paler, whereas specimens from more humid forested habitats tend to be darker. Labial palp segment 1 apical cavity not well defined proximally due to long scales projecting over it. Dorsal abdominal lines inconspicuous or absent. Outer row of forebasitarsal spines single, or partly double. Forewing upperside ground colour beige; fifth postmedial line, and sometimes the first line, heavy; lines 2 and 4 weak, lines 6 and 7 vestigial or absent. Hindwing upperside red; basal area black, extending along inner margin towards the tornus.
Male genitalia: Uncus rather narrow, slightly concave beneath apically, clothed with erect hairs, the apex rounded, weakly sinuate. Gnathos obtusely pointed, apex upcurved, strongly convex beneath. Valve with numerous stridulatory scales. Harpe slender, weakly sigmoid, apically pointed. Phallus apically with a short, multidentate process on the right, and a long oblique row of teeth on the left, on a slightly elevated ridge that ends in a slender process lying closely on the aedeagus.
Female genitalia: Antevaginal plate with ridge proximal to the ostium bursae rather thin, but well sclerotised and smooth, becoming lower posteriorly to form a half-moon shape.