Ambulyx substrigilis, the dark-based gliding hawkmoth, is a species of moth of the family Sphingidae.

In The Fauna of British India, Including Ceylon and Burma: Moths Volume I, the species is described as follows: The hind wing crenulate.

Pale ochreous or greyish brown to purplish brown in color; an olive-green band between the antennae; lateral olive-green bands on the thorax meeting on metathorax; abdomen with two olive blotches on the fifth segment, and one on the seventh in some specimens; sides of palpi and pectus ferruginous; some specimens with a ferruginous line down the vertex of abdomen.

Fore wing with a basal olive speck; a subbasal olive blotch on the costa, and another below the median nervure, the former being obsolete in some of the forms; two irregularly dentate, more or less obsolete antemedial lines, and two similar lunulate postmedial lines; a curved band from apex to outer angle, the inner part of which is light, the outer dark.

Hind wing ochreous, mottled with fuscous; an erect medial, and curved more or less lunulate postmedial band; some specimens with the anal half of the margin dark.