There has been some coufusion lately in regard to the limits and synonymy of these two common species, partially due to Dr. Harris' unsatisfactory reference to them in his “Report on the Insects of Massachusetts.” 1841. and to the inaccessibility of Prof. Peck's original descripticn of A. vernata.

In the numerous notes on these species and references to them in recent publications, they are in nearly allcases confounded together or wrongly determined; and I have not found them correctly named in a single collection which I have examined.