146 Annals Entomological Society of America [Vol.1, 



mon nor widely distributed. Nigristernum occupies the eastern 

 United States and Canada, while its closely related species, 

 punctatus, is from the southwest, Mexico and the West Indies. 

 Hyalinus and crassicomis are the only American species that 

 are also found in the Old World. It seems more than probable 

 that these have both emigrated to this country, hyalinus by the 

 southern route and crassicornis by the northern, and here given 

 rise to our peculiarly American species. From the latter, un- 

 doubtedly we get viridicatus, while all the remaining species seem 

 to have sprung from the hyalinus stock. 



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