This book, "On the North American Asilidae Dasypogoninae, Laphrinae, with a new genus of Syrphidae. 1", by Samuel Wendell Williston, is a replication of a book originally published before 1883. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.