Hyloicus crassistriga
Antenna thickened distally, with a large brown patch over the greater part of the dorsal surface. Proboscis short and weak. Palpus slender, rough-haired; first segment pale.Fore- and midtibiae with very few spines apically. Paronychium without lobes. Body upperside pale brown, palest laterally; a black oblique line on each side runs obliquely from the antennal base to the collar; the edge of the collar and upper edge of mesothoracic tegula broadly black, especially the tegula. Abdomen upperside with a black mesial line and black lateral patches. Body underside cinnamon brown. Forewing upperside wood brown with brownish black markings: 2 very oblique antemedial costal lines crossing the apex of the discal cell, followed a short streak in the cell, and continued from vein CuA2 to the inner margin, which they reach about 5 mm. from the base, to which they are connected by a streak, the space between the lines black posteriorly; 2 heavy discal streaks posterior to veins M3 & CuA1, the anterior one the longer; a third streak from vein M1 to M2 more oblique; the discal lines crossed by these streaks not prominent, being represented by blackish brown patches, but becoming clearer beyond vein CuA2; a heavy oblique apical line; some small submarginal spots; the fringe brownish black with white dots. Underside of both wings somewhat greyish brown. Forewing underside with a vestigial discal band nearer the distal margin than the discal cell; a thin apical line present. Hindwing upperside brown, paler towards base, fringe spotted with white. Hindwing underside with 2 vestigial distal bands. FWL: 38 mm.
Female genitalia: Ostial plate similar to that of Sphinx ligustri. Ostium proximal, a small folded ridge proximal to it, continued on both sides to the apex of the plate as a longitudinal fold.