COPEPODA 



761 



27(32,35) Process much shorter than penultimate segment -. 28 



28 (31) Right endopodite of male fifth foot rudimentary 29 



29 (30) Lateral spine of second segment of right exopodite of male fifth 



foot terminal Diaptomus lintoni Forbes 1893. 



Found in Yellow- 

 stone Park and in 

 the valley of the 

 Gal la tin River, 

 Montana. 



FIG. 1185. Diaptomus 

 lintoni. A, fifth feet 

 of male. X no. B, 

 terminal segments 

 of right antenna of 

 male. X 220. C, 

 fifth foot of female. 

 Xas8. (Original.) 



30 (29) Lateral spine of second segment of right exopodite of male fifth foot 

 near the proximal end. . Diaptomus trybomi Lilljeborg 1889. 



FIG. 1186. Diaptomus trybomi. A, abdomen of female. X 70. B, fifth feet of male. X 120. 

 C, terminal segments of right antenna of male. X 100. (After De Guerne and Richard.) 



The antennal process is dentate on the outer margin and the abdomen of the female asym- 

 metrical. Has been found only in Oregon. 



Length of female, 1.5 mm. 

 Length of male, 1.4 mm. 



