762 



FRESH-WATER BIOLOGY 



31 (28) 



Right endopodite of male fifth foot about equal in length to first 

 segment of exopodite. . . Diaptomus judayi Marsh 1907. 



FIG. 1187. 



Diaptomus judayi. A, terminal segments of right antenna of male. X 290. 

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



B, fifth feet 



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, 0.93 mm. 



Length of male, 0.9 mm. 



32 (27. 35) Process nearly or fully equals penultimate segment. 



33 



33 (.347 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 m 



FIG. 1188. Diaptomus tcnuicaudatus, mule. A, fifth feet. 

 X 145. B, terminal segments of right antenna. 



X 194. (Onginal.) 



