Trosia dimas, the rosy ermine, is a moth in the family Megalopygidae. It is found in Colombia, Venezuela, Ecuador, Brazil, and Peru.
Taxonomy The first description of this species was by Pieter Cramer in 1775, who named it Bombyx dimas. Subsequent authors placed it in the genera Chrysauge, Idalus, and Sciathos until Harrison Dyar, following Hübner in 1822, assigned it to Trosia, where it has remained.
Description This species has a wingspan of about . The head, abdomen, and legs are reddish and the tarsi black, spotted with white. The collar and thorax are yellowish buff, the latter spotted with red. The forewings are greenish yellow, with a postmedial row of black spots. The hindwings are roseate. The underside is dull roseate. In this species, the costa of the forewings is of the same color as the wing.
Habitat Trosia dimas is found in rainforests and cloud-forest at altitudes between . Byrsonima coccolobifolia is the host plant of Trosia dimas.Diniz, I. R., Morais, H. C., & Camargo, A. J. A. (2001). Host plants of lepidopteran caterpillars in the cerrado of the Distrito Federal, Brazil. Revista Brasileira de Entomologia, 45(2), 107-122.
Range Trosia dimas has been observed in Colombia, Venezuela, Ecuador, Brazil and Peru. Observations recorded in various collections and citizen science initiatives suggest the range where this species occurs is from South America to North America
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