The writer is at present engaged in a study of the Aphidae of Sorth America commonly included in the genus Chermes. During this study what is evidently a new species appeared and is herewith described as the first contribution to this study The author would be interested in seeing member of this genus from any part of North America.

The well known name Chermes is retained in describing this species, although it is evident that it is no longer available for the Aphidae, until such a time as the literature is available and the correct name for the genus call be determined.

Through the courtesy of Dr. S. Forbes I have recently had the opportunity of working over the Ephemerid material contained in the collection of the Illinois State Natural History Survey at Urbana, Ill. In this connection I offer the following descriptions of species which appear to be undescribed, as well as a note on a Mexican species, the identity of which has been doubtful.