762 FRESH-WATER BIOLOGY 



31 (28) Right endopodite of male fifth foot about equal in length to first 

 segment of exopodite. . . Diaptomus jiidayi Marsh 1907. 



Fig. 1187. Diaptomus jitdayi. A, terminal segments of right antenna of male. X 290. B, fifth feet 

 of male. X 145. C, abdomen of female. X 165. (Original.) 

 Lateral spine of the second segment of the right exopodite is median, first segment of the 

 female abdomen has a process on the posterior margin on the right side. Has been found only 

 in the mountains of Colorado. 



Length of female, o.gs mm. 

 Length of male, 0.9 mm. 



32 (27. 3s) Process nearly or fully equals penultimate segment 33 



33 (.34/ Right endopodite of male fifth foot equals in length first segment 



of exopodite, spines of first basal segments large. 



Diaptomus tenuicaudatus Marsh 1907. 



Found in Saskatchewan. 

 Length of male, 1.195 mm. 



Fie. 1188. Diatlcmusltnuicaudalus,ma\e. .^, fifth feet. 

 X I4S. B, terminal segments of right antenna, 

 X 194- (Original.) 



