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UNIVERSITY OF COLORADO STUDIES 



12 (ii) Distal digit of male clasping antenna with a slight, uniform curvature 

 and pointed at the tip. Frontal process more than one-half first joint of 

 antenna. Length: male, 22; female, 23 mm. 



Sireptocephalus coloradensis Dodds 



Eldora (type locality), Ward, Ft. Collins; 5,000-8,500 ft. 



13 (3) A well-developed carapace present 14 



14 (24) Carapace shieldlike, covering anterior portion of body only. About 

 60 pairs of appendages. Back of nth, there are more than one pair of 

 appendages on a segment Order Notostraca 



Family Apodidae 15 



15 (21) End of telson without a flat process. . . . Genus Apus 16 



16 (17) Carapace as long as exposed portion of body. Segments exposed 

 back of carapace: male, 11; female, 9. Telson with 2 median and 2 paired 

 dorsal spines. Length, 29 mm Apus aegualis Packard 



La Junta. (Mexico, Lower California, Texas, Nebraska, Kansas, Colorado.) 



17 (16) Carapace shorter than exposed portion of body .... 18 

 (8 (19, 20) Telson with 3 median and 2 paired dorsal 



spines. Segments exposed back of carapace, 29. 

 Segments back of last appendages: male, 11; fe- 

 male, 9( ? ). Length, 50 mm. 



Apus newberryi Packard 



Greeley. [Colorado and Utah.] 



Fig. 9. — Apus aequalis. 



Fig. id. — Apus new- 

 berryi. Telson. (After 

 Packard.) 



Fig. II. — Apusluca- 

 sanus. Telson. (After 

 Packard.) 



Fig. 12. — Apuslon- 

 gicaudatus. Telson. 

 (After Packard.) 



19 (18, 20) Telson with i median and 2 paired dorsal spines. Segments 

 exposed back of carapace: male, 33; female, 29. Segments back of last 

 appendages: male, 13; female, 11. Length about 50 mm. Measurements 

 in Packard's description are about half as great, and agree with riiy Montclair 

 specimens. Those from Ft. CoUins are much larger but agree in details 

 of structure Apus lucasanus Packard 



Ft. Collins, Montclair. [Kansas, Colorado, Lower California.] 



