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PROCEEDINGS OF THE NATIOIN^AL MUSEUM 



VOL. 75 



in Yellowstone Lake, in Flathead Lake, Mont. ; in Lake Pend 

 d'Oreille, Idaho ; in Washington Lake, Seattle ; and has been reported 

 by Schacht, 1897, in Indiana and Oregon. Its distribution is shown 

 in Figure 2. 



DIAPTOMUS ASYMMETRICUS Marsh, 1907 



Tliis species has been reported onh" from Habana, Cuba, in a 

 collection sent by Prof. C. F. Baker. 



DIAPTOMUS AUGUSTAENSIS, Turner, 1910 



Turner's original description of his material, from a temporary 

 pond in a marsh at Augusta, Ga., constitutes the only known record 

 of this species. 



Figure 2.— Distribvtion of Diaptomus ashlandi Marsh (#), D. ci.avipks Schacht (+), D. dorsalis 

 Marsh (D), and D. leptopus Forbes (O) 



DIAPTOMUS BACILLIFER Kolbel, 1884 



The distribution of D. hacillifer in North America is shown in Fig- 

 ure 1. It was first found in America in collections made by Frits 

 Johansen at Bernard Harbor on the Arctic coast of Canada, March, 

 1920, and later in collections made by Professor Parker on St. Paul 

 Island, off Alaska. An examination of the description of a species 

 found in the mountains of Colorado by Dodds 19155, and called by 

 him D. arapahoensis, makes it evident that this is D. hacillifer. 



This species is found in many localities in northern Europe and 

 Asia, in the islands north of Siberia, and in the mountains of south- 

 ern Europe and central Asia. It is a stenothermal form confined to 

 the colder waters. While it has been found in America in only the 

 three localities, and those far apart, it is probable that further collec- 



