I have had occasion to refer three times in these pages to the genus Eupoeya, placing it, with some doubt, in the Megalopygidæ. Very recently I have been so fortunate as to discover the larva in Florida on the mangrove. It is a true Eucleid, contrary to my expectation, but in confirmation of Dr. Packard's original statements. This genus, then, removed from the Megalopygidæ, renders it possible to define the family by the branching of vein 1 of primaries, instead of by the pectinations of the antennæ to the tip, which proves to be a fallacious character.