This species has dark brown forewings marked with two prominent white-bordered stigmata and a white subterminal line.

Seitz states - Distinguished from rivularis F. by the absence of the violet sheen; the markings white instead of yellow; the upper stigmata not conjoined; a conspicuous black blotch above inner margin near base; hindwing fuscous.

Larva dull brown, with darker dorsal line and oblique subdorsal streaks.

H. bicruis is a nocturnal pollinator meaning that it frequents flowers late in the day or at night.

[10][11][7] Instead, pollen granules catch on their bodies and legs when they come into contact with a flower to feed on nectar.

[12] When the moth then visits the next flower, pollen granules may be transferred from the body to the stigma of the receiving plant.