﻿Pec. 1895] Webster. North American Species of Diaiirotica. 161 



directly northward or southward, and the valleys of these streams are 

 largely devoted to corn growing, the land being continually planted 

 year after year, in some places since the beginning of the present cen- 

 tury. This species appears to gain access to these valleys from the 

 west, and we find that one after another is being overrun in the east- 

 ward march of the species. First it appeared in the valleys of the Little 

 and Big Miami Rivers, then the Upper Wabash and Maumee, and this 

 year it occurs throughout the entire length of the Scioto River and the 

 upper portion of the Sandusky River, thus nearly covering the western 

 third of the State. 



The distribution of D. atripennis and its varieties is given by Dr. 

 Horn (Trans. Am. Ent. Soc. Vol. XX, p. 95) as extending from Massa- 

 chusetts* to Dakota, Kansas and Texas. It does not appear in the lists 

 of Coleoptera collected about Buffalo, N. Y., by Reinecke and Zesch, 

 or about Cincinnati, Ohio, by Dury, about Detroit, Mich., by Hubbard 

 and Schwarz, or at Iowa City, by H. F. Wickham. Years ago, when 

 I was engaged in exchanging Coleoptera, this appeared to be one of the 

 species most desired among collectors, though I never failed to find the 

 Nds. fossata in abundance during August and September, in northern 

 Illinois, at an elevation of little more than See feet. Prof. Cockerell 

 records it from Gallinas Canon, New Mexico, at an elevation of 7,000 

 feet. 



Except vincta, which is an extreme Southeastern species, all of our 

 Diabroticas appear to have originated in the extreme Southwest, Mexico 

 and Central America, at least such as we cannot trace directly to South 

 America. The Reeky Mountains appear to have formed a divide in 

 the current and sent two species to the west coast, while to the east of 

 these mountains, vittata, 12-pitnctata excepted, all appear to have 

 worked their way northward along the eastern base of this range, until 

 reaching Colorado and Kansas, when they have swept broadly to the 

 northeast, precisely as has /ongiconiis, which Say discovered in 1824, 

 near the base of the Rocky Mountains. 



Prof. Cockerell has sent me the following list of Diabrotiiu, found 

 in the West Indies, all being from Cuba. D. annitlata, cyaiwspila, 

 impressa, loricata, relicta and semicyanea. D. amccniila and D. octo- 

 notata are from Pacific islands, and D. liinbata from the Galapagos 

 group. This may be a good place to call attention to the fivct that 

 Jacoby's list of the phytophagous coleoptera of Japan, gives a single 



*Specimens collected about Lowell, by Mr. Frederick Blanchard, are much lighte 

 in color than are western specimens. 



