The early appearance of Lepidoptera gave indication of an unusually good season for field work, but the cold and wet weather in May and June apparently depopulated the woods and fields. Papilios were rare, and the Argynnidæ that usually fly in clouds above the prairies were conspicuous by their absence. The number of species taken was not much reduced, but my notes show a less number of examples in proportion to the time given to their pursuit than in any previous season.