It seems probable to me that Limenitis proserpina will be found related to L. arthemis, the two being forms of one species, as in Grapta comma and dryas, and I desire to call the attention of Lepidopterists who live where these species or forms are found, that they may observe them from this point of view. They are alike in size and shape, and so far as my experience and that of Mr. Mead goes (confined in both cases to the Catskill Mountains), they are always associated.