Eilema crassicosta is a moth of the subfamily Arctiinae. It was described by Hervé de Toulgoët in 1957. It is found on Madagascar.
This species has a wing length of 10 mm and a wingspan of 22 mm.Toulgoët, H. de (1957). "Descriptions d'Arctidés Nouvelles de Madagascar (Lep.) 6ieme note". Annales de la Société Entomologique de France. 125 (1956): 57–73, pls. 1–2.
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