Pseudalypia crotchii is a moth of the family Noctuidae. It is found in California and Colorado.
Pseudalypia crotchii is a highly unusual Acontiinae species and is unlikely to be confused with any other species in the subfamily or in the Noctuidae as a whole. The basic color is black. The costa is white. The outer margin of the hindwing has a pure white fringe. Two basic forms of the species exist. Both forms occur in both sexes. The first form has a wide white stripe in the general position of the postmedial line and a white spot at the apex of the forewing. The second form lacks these white markings. The forewing length from base to apex in one selected individual is 11 mm.[1]
The larvae feed on Malvastrum exile and Malvastrum parviflora.