North American Species of Diaptomus. 183 



D. sanguineus Forbes is very common throughout central 

 and southern Illinois, and has been recorded from New York, 

 Wisconsin, -Minnesota, and Alabama. 



1>. stagnalis Forbes is also a common species, and is re- 

 corded from Minnesota, Illinois, Ohio, Kentucky, and Ala- 

 bama. 



I), shoshone Forbes has never been found outside of Yellow- 

 stone Park. 



D. pallidus Herrick is an exceedingly common species in 

 central Illinois and has been recorded from Ohio, Wisconsin, 

 and Minnesota. 



1>. albuquerquensis Herrick was first described from Albu- 

 querque, N. M., and is also found in Florida. 



I), novamexicanus Herrick has only been recorded from 

 Albuquerque, N. M. 



I), oregonensis Lilljeborg is a very common species in Illi- 

 nois, occurring generally with 1>. siciloides Lillj. and 1). palli- 

 dus Herrick. It is also common in Wisconsin and is found 

 in Michigan, Minnesota, and Oregon. 



I). siciloides Lilljeborg is found in immense numbers at 

 Havana, 111. I have found it also in Iowa and Indiana col- 

 lections, and it was originally described from L. Tulare, 

 Fresno, Cal. 



1>. mi tint its Lilljeborg is probably the common species in 

 the northern tier of states. It has been found in Yellowstone 

 Park, in the Great Lakes, and in Wisconsin, Michigan, 

 Newfoundland, Greenland, and Iceland. 



D. franciscanus Lilljeborg has been found only by G. 

 Eisen, near San Francisco, Cal. 



/>. elseni Lilljeborg is also a California species. 



1). signicauda Lillj., one of the most peculiar of American 

 species, is recorded only from the Sierra Nevadas. 



J>. trybomi Lilljeborg is recorded only from Multnomah 

 Falls, Oregon. 



7). ashlandi Marsh seems to be the most widely distributed 

 of American forms, having been found in the Great Lakes, 

 in Indiana, Michigan, Wisconsin, Oregon, Idaho, Washing- 

 ton, and in Yellowstone Park. 



