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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 75 



seems desirable to consider it a distinct species*. Forbes described 

 the species from material gathered at Gardner, Mont. Schacht, 1897, 

 found it in collections from Portage Slough, Manitoba. Dodds, 

 1908, 1915a, 19156, 1924, found it in Colorado in Red Rock Lake, 

 Boulder, Tolland, and in several lakes in the Pikes Peak region. It 

 has also been found in Colorado at Mount Carbon, in a lake between 

 Kebler Pass and Floresta, and in Twin Lakes. It has been collected 

 in the Birch Hills, Saskatchewan; in Flathead Lake and at Red 

 Lodge in Montana ; in Devils Lake, N. Dak. ; at Ithaca, N. Y. ; and 

 at Woods Hole, Mass. Its distribution is shown in Figure 6. It is 

 noticeable that while, like Z>. leptopus^ it occurs in both the East and 



Figure 7.— Distribution of Diaptomus reighardi Marsh {%), D. coloradensis Marsh (O), 



AND D. SALTILLINUS BREWER (+) 



West, it has not been collected in the Central States where D. leptopus 

 is fairly common. 



DIAPTOMUS PURPUREUS Marsh, 1907 



D. fuT'pureus was described from material collected by Prof. C. F. 

 Baker at Habana, Cuba, and no other collections have been made 

 up to the present time. 



DIAPTOMUS REIGHARDI Marsh, 1895 



The original description of B. reighardi was made from collec- 

 tions made in Intermediate Lake in northern Michigan. It has 

 since been found in Crooked Lake in northern Michigan; in a lake 

 on Beaver Island in Lake Michigan; at Zion, 111.; Hammond and 

 Gary, Ind. ; and at Sodus Bay, N. Y. Its distribution is shown in 

 Fisure 7. 



