Among the parasites so far found to attack and destroy Aletia argillacea Hübn., aside from two not reared to the perfect state, are the following: Obtained from the egg, Trichogramma pretisa n. sp. from the larva, Tachina aletiæ n. sp., and Sarcophaga sarraceniæ Riley ; from the pupa, Pimpla conquisitor (Say), Cryptus nuncius Say, Chalcis ovata Say and, Cirrospilus esurus, n. sp.