This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the publi

Excerpt from Manual of the Families and Genera of North American Diptera Eight years ago the author of the present work published a small volume in which he att

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced