ART. 14 NORTH AMERICAN COPEPODS MARSH 23 



digitate process and an inner spine which is nearly straight. In 

 many of the females there are only two ova. 



Forbes found it in central Illinois. Herrick and Turner, 1895, 

 reported it in Minnesota, Ohio, Kentucky, and in 1887 Alabama. 

 Turner, 1910, found it in Georgia. The author has found it in Jack- 

 son Park, Chicago, and in collections made by H. E. Barber in a 

 temporary pool near Great Falls, Va. It is an early spring form. 

 Its distribution is shown Figure 12. 



DIAPTOMUS TENUICAUDATUS Marsh. 1907 



D. tenuicaudatuys was described from material collected by Dr. 

 Russell T. Congdon in Glen Lake, Saskatchewan. It was found in 

 collections made by Prof. H. H. Mackay in Lake Nipigon, north of 

 Lake Superior, and recently the author has collected it from Utah 

 Lake, Utah. Its distribution is shown in Figure 6. 



DIAPTOMUS TRYBOMI Lilljeborg. 1889 



D. tryhomi has not been reported by any one since the original 

 description in DeGuerne and Kichard's monograph. It was said to 

 have been collected by M. Trybom at " Multrooma Falls, Oregon." 

 It is to be presumed Multnomah Falls is the locality. 



DIAPTOMUS TYRELLI Poppe, 1888 



D. tyreUi was described from collections made in Summit Lake, 

 British Columbia. It was described in manuscript under the name 

 D. fresnanus by Lilljeborg from material ol)tained near Fresno, Calif. 

 From collections made in the Pribilof Islands, Alaska, Juday and 

 Muttkowski in 1915 described it calling it D. juilnlofensis. It was 

 found in collections made by the United States Bureau of Fisheries 

 in Alturas Lake, Idaho. It has also been found in Yellowstone Na- 

 tional Park and in localities in southeastern Utah. Its distribution 

 is shown in Figure 5. 



DIAPTOMUS VIRGINIENSIS Marsh. 1915 



D. virginiensh has thus far been found in only one locality, in 

 Black Pond near Great Falls, Va. 



DIAPTOMUS WARDI Pearee. 1905 



Z>. xoardi was described from material collected near Spokane. 

 Wash. Juday and Muttkowski 1915 reported from St. Paul Island, 

 near Alaska, and the author has found it in collections from the 

 same locality. 



