48 UNIVERSITY OF COLORADO STUDIES 



Natatory setae very long, usually twice as long as distance from their origin to tip 

 of end claws. Second feet with three setae, one long, the other two rather 

 short and backwardly directed. Furca usually normal . Cyclocypridinae. 



Natatory setae lacking or little developed. Second antennae of female five- 

 segmented; of male mostly six-segmented, and with two sense-clubs. 

 Terminal segment of second foot with three unlike setae, two of which are 

 backwardly directed Candoninae. 



Subfamily ERPETOCYPRIDINAE 



Erpelocypris Brady and Norman has furca normal, and two setae on first segment 

 of first foot. E. olivacea Brady and Norman was found by Beardsley in abundance 

 in Carter's slough near Greeley. 



Subfamily CYPRIDINAE 



Cypris O. F. Muller, with the subgenus Cyprinotus Brady, are represented by 

 species recorded by Chambers in 1877. Cypris altissimus Chambers, a "bright 

 deep green" species, was found on Mount Elbert, at an altitude of about 12,000 ft. 

 Cypris {Cyprinotus) grandis Chambers was from the Mount Harvard region, at 

 an altitude of about 8,000 ft. It was of a bluish-white color, some specimens 

 pale greenish. According to Sharpe, C. grandis is not properly a Cyprinotus, but 

 rather represents an unnamed subgenus. Cypris fuscata (Jurine) was found near 

 Greeley by Beardsley. It has both spines on first process of first maxilla toothed, 

 whereas these spines are smooth in C. altissimus, C. virens, etc. Cypris florissan- 

 tensis Cockerell is fossil in the Miocene shales of Florissant. 



Subfamily CYPRIDOPSINAE 



Cypridopsis Brady, a regularly parthenogenetic genus, is represented by C. vidua 

 (O. F. Muller) at Greeley (Beardsley). It is a very plump form, with three trans- 

 verse dark bands on dorsal and lateral aspect of carapace. 



Subfamily CYCLOCYPRIDINAE 



Natatory setae reaching but to tips of end-claws or slightly beyond; furca normal; 



shell tubercled or furrowed in region of eyes . . Ilyocypris B. and N. 



Natatory setae reaching well beyond end-claws. 



Terminal segment of second foot small; ductus of circlets of spine-like setae, and 



a distinct central axis; fourth segment of second antenna of male with two 



sense-organs Cypria Zenker. 



Terminal segment of second foot long and narrow, three times as long as broad; 

 ductus of numerous long filaments, and no distinct central axis; fourth 

 segment of second antenna of male with no sense-organ on distal end 



Cyclocypris Brady and Norman. 

 Ilyocypris Brady and Norman is represented by I. bradyi Sars at Greeley. 

 Cypria Zenker includes C. nions (Chambers), collected on Mount Elbert at about 

 11,000 ft. Sharpe separates this from the other American species of the genus 



