Aeromachus dubius, the dingy scrub-hopper,[1][2] is a butterfly belonging to the family Hesperiidae.

It ranges from India to China, including Malaya, Assam, Myanmar, Laos, Vietnam, Hainan and Yunnan.

Upperside dark (olive-brown), the post-medial series of spots on the forewing very indistinct or wanting, sex mark on the forewing a small inconspicuous fold of raised scales in cell 1A, next vein 1A near the middle.

Second joint of palpi clothed with yellow and black hairs intermixed.

Female differs from the male in wanting the sex mark and in having the pale spots proper to the underside more strongly developed, and consequently the postmedian series appears faintly in the costal portion of the upperside of the forewing.The larva (caterpillar) has been recorded on Cyrtococcum trigonum.