Bulletin of the United States National Museum, Vol. 31 (Classic Reprint)

Excerpt from Bulletin of the United States National Museum, Vol. 31

That which has been aimed at in the present Synopsis is the description, as full and complete as possible, of the North American Syrphidae. The labor involved in the determination Это и многое другое вы найдете в книге Bulletin of the United States National Museum, Vol. 31 (Classic Reprint)