The genera of the same regions are included in the present paper as in a former one on Hypogymnidæ (Can. Ent., XXIX., 12). The palæarctic Lachneids of the old world have been admirably treated by Aurivillius (Iris, Dresden, vii., 121–185), and I am indebted to his work for valuable information, as well as to the works of Kirby and Hampson. In going over the literature I did not always confirm Kirby's types of the genera; but rather than disturb the matter again, I have accepted them as modified by Aurivillius; but with the restoration of Hübner's Tentamen names, I drop Gastropacha, as it is a synonym of Lasiocampa, being proposed in the same sense to include all the species of the family. Following Wallengren, I separate catax and rimicola from Eriogaster as defined by Aurivillius for convenience in the table, though I do not doubt that the venation is as variable as Aurivillius states (Iris, vii., 147). I cannot separate the new genus Paralebeda, Auriv., from Odonestis by anything that is stated.