Colobochyla salicalis, the European lesser belle or lesser belle, is a species of moth of the family Erebidae. It is found over almost all of the Palearctic.
C. salicalis Schiff. (71 b). Forewing pale fuscous finely dusted with whitish, so as to appear grey; lines ferruginous edged with pale ochreous; the inner straight, the outer and subterminal somewhat curved inwards, the latter running into apex; hindwing pale fuscous, darker terminally, showing a faint subterminal line.; the forms occurring in [Amurland and Japan] are greyer or paler that in Japan, —ab. cinerea Btlr., — greyer than the type; while the Amurland form — ab. laetalis Stgr. — is not only much paler but slightly smaller. Larva green, with the segmental incisions yellowish; the headalso green; spiracles black.[1] The wingspan is 26–30 mm.
Adults are on wing from May to July. There is one generation per year.
The larvae feed on the young shoots and leaves of Populus tremula.