The North American species of the genus Callimorpha are exceedingly interesting both from their beauty and from the extreme variations to which some of the species are subject, and which has given rise not only tot he creation of numerous synonyms, but also to distinct species being regarded as merely varieties of other forms.

Female. Length .03 inch. Head and thorax black. Antennæ 11 jointd, scape and pedicel dilated below, flagellum and club pale brown, funicle joints slender, cylindrical, club greatly and enormously enlarge, not jointed. Legs long, slender, yellow. Abdomen ovate, black shining; petiole slender, yellowish. Wings hyaline, very narrow, with extremely long ciliæ; submarginal vein short; marginal vein punctiform.

I have received form Mr. Behrens, of San Francisco, the following descriptions for publication, and with them the specimens to which they refer. The Papilio is a very extraordinary aberration, probably owing its color to a change in the food plant. I learn from Mr. Behrens that four specimens were obtained, all agreeing with each other. The Catocala is, I have no doubt, the form referred to by me (Pacific Coast Lepid., No.14, Proc. Cal. Acad Sc., 1875) as having been seen by the late Baron Terloo at San Jose, Cal. I think it a good species, and in this view I am sustained by those excellent authorities on Catocala, the Rev. G.D. Hulst and Prof. G.H. French.