Protambulyx strigilis (Linnaeus, 1771)

Two colour forms: a pale form in which the forewing upperside is pale yellowish-grey and the hindwing upperside is deep golden-orange with dark transverse lines, and a dark form in which the forewing upperside is reddish-brown and the hindwing upperside is deep golden orange with orange-brown transverse lines. Forewing with a distinct, dark marginal line and a more distinct dark patch along the inner margin basad of the tornus. Transverse lines of hindwing underside irregular; submarginal line distinct; outer margin pale. Uncus produced into long, sharply pointed process, gently upcurved.Gnathos broad and short, with a shallow emargination. Valve with a narrow, elongate, reniform patch of stridulatory scales. Harpe with a rather high submesal process, edge somewhat raised. Aedeagus with a less evenly curved apical ridge than in Protambulyx eurycles and with a large proximal tooth. Ostium bursae distally truncate; lamella postvaginalis short with transverse ridges or folds; anterior edge of ostium bursae raised, even, swollen near the tip.