Attentive readers of the entomological portion of the late Report of the Commissioner of Agriculture for the Province of Ontario, will have noted the fact already well known, to entomologists, that the female moth of this species is wingless, and lays her eggs on the outside of the cocoon from which she has escaped. Last fall the moths were unusually common, and their nests of eggs are now so abundantly distributed among our fruit trees that unless some effort is made to destroy them the larvæ will probably be exceedingly numerous and destructive during the approaching season.