COPEPODA 



771 



63 (48, 56) Right endopodite of fifth foot of male equals or only slightly ex- 

 ceeds first segment of exopodite 64 



64 (65) Terminal segment of right exopodite of male fifth foot has oblique 

 ridge on posterior surface, lateral spine exceeds segment in 

 length. ..... Diaptomus albuquerquensis Herrick 1895. 



The fifth cephalothoracic segment of the female 

 has a dorsal process, and the endopodites of the 

 fifth feet are commonly two-segmented. Found in 

 New Mexico and Colorado. As the name indi- 

 cates, this form was originally described by Her- 

 rick, from material collected in Albuquerque, N. M. 

 It is found, however, from Colorado to the City of 

 Mexico, and seems to be a typical form of the 

 Southwest. 



Length of female, 1.76 mm. 



Length of male, 1.58 mm. 



FIG. 1205. Diaptomus albuquerquensis . A, dor- 

 sal process of female. X 180. B, fifth feet of 

 male. X 49. (Original.) 



65 (64) Terminal segment of right exopodite of male fifth foot does not 

 have oblique ridge on posterior surface; lateral spine short, 

 about one-half length of segment. 



Diaptomus novamexicanus Herrick 1895. 



Found in New Mexico. 



Length of female, i.i to 1.2 mm. 



FIG. 1206. Fifth feet of 

 male Diaptomus novamexi- 

 canus. (After Herrick and 

 Turner.) 



66 (47) Terminal processes of left exopodite of fifth feet of male digiti- 

 form, right endopodite shorter than first segment of exopo- 

 dite 67 



