Cocytius antaeus (Drury, 1773)

Forewing upperside semitransparent posterior to vein CuA1 due to the scaling being less dense and that of the upper layer of the underside being hair-like; the black dash here consequently more or less obliterated; dash posterior to vein M3 heavier, but scaling modified here also; buffish white subbasal line separated into a costal, a more distal disco-cellular, and a posterior part, differing from Cocytius duponchel in that the posterior part is more distal, at right-angles to the cubital vein and more distal than the costal part; the reverse is true in Cocytius duponchel; postdiscal line more curved than in Cocytius duponchel. Both wings undersides often with a conspicuous ochre-yellow wash. Hindwing upperside with transparent spaces long, that posterior to vein M1 obviously longer than the brown wing border is broad; these spaces incised distally as the border is dentate between the veins; a semitransparent patch that posterior to vein CuA2 anteriorly. Foretibia a little longer, midtibia clearly longer, and hindtibia a little shorter than their respective 1st tarsal segments. Foretarsus similar to that in Cocytius duponchel, but the 1st segment with only the external spines, the comb represented by just 1 or 2 apical spines, the other segments with a few more spines than in Cocytius duponchel. Foretarsus with all 4 rows of spines, the comb of the 2nd, not so regular as in the male, and the spines directed more distad. Foretibia little longer, mid- and hindtibiae 1-2 mm. longer than their respective 1st tarsal segments.

Male genitalia: Uncus somewhat bi-arcuate in lateral view, the apex pointing ventrad and distad, more or less acute. Gnathos similar to that of Cocytius lucifer, but more parallel-sided and the apex rounded-truncate.Valve large, with a high fold near the base above the harpe with numerous bristles. Harpe with a strong, subcylindrical process that is somewhat club-shaped, being somewhat dilated distally; heavily dentate distally. Juxta represented by a collar-shaped fold that is open ventrally and covered with minute hairs. Phallus with one, small, subapical tooth.

Female genitalia: Ostial plate very large, well sclerotised also apically, but with few or no scales, subtruncate, the lateral edges thickened or recurved. Ostium free, with the edges less raised than in Cocytius lucifer or Cocytius beelzebuth, more proximally placed than in the rest of the genus, being much nearer the base than the apex. Mated females generally with a high, longitudinal crest of whitish substance on the ostial plate.