ROCKY MOUNTAIN BEES 189 



First recurrent nervure entering first submarginal cell; alpine species (Topaz Butte, 

 Colorado, at flowers of Drymocallis fissa, June 23, 1907, S. A. Rohwer). 



Panurginus verus Ckll. 

 First recurrent nervure joining, or almost joining, first transverso-cubital. 



7 



7 Smaller, mountain species; upper corner of apical truncation of marginal cell angular; 

 legs of male dark. Panurginus cressoniellus Ckll. (7) 

 Larger species, visiting Malvastrum in the foothills and plains; upper corner of apical 

 truncation of marginal cell rounded; legs of male mainly yellow. 



Greeleyella beardsleyi Ckll. 



8 Eyes hairy; parasitic bees, without scopa. 9 

 Eyes not hairy. 1 5 



9 Legs red. 1 o 

 Legs dark. 1 1 



10 Male about 8 mm. long, with punctures on middle of fifth abdominal segment con- 

 spicuously smaller and denser than those of apical half of fourth. (Boulder, July 20, 

 W. P. Cockerell). Coelioxys edita Cresson 

 Male over 1 1 mm. long, with punctures on middle of fifth abdominal segment hardly 

 different from those on apical part of fourth (Boulder, August, at flowers of Grin- 

 delia, W. P. Cockerell). Coelioxys deplanata Cresson 



11 Very small, about 7 mm. long (Boulder). Coelioxys deani Ckll. 

 Larger, 10 mm. or over (male gilensis sometimes 9 mm.). 12 



12 Tarsi more or less red. 13 

 Tarsi dark. 14 



13 Last ventral segment of female broad, its lateral margins strongly convex, its apex 

 rounded, with a small projection (Boulder, at flowers of Melilotus alba, July, S. A. 

 Rohwer). Coelioxys gilensis Ckll. 

 Last ventral segment of female narrower, its lateral margins nearly straight, each 

 with a notch (Boulder, July 3, Cockerell.) Coelioxys rufitarsis rhois Ckll. 



14 Last ventral segment of female broad, suddenly narrowing to the conoid apical pro- 

 jection (New Mexico, Cockerell; Milwaukee, Wisconsin, Graenicher). 



Coelioxys ribis Ckll. 

 Last ventral segment of female narrow, notched but not abruptly narrowed at the 

 beginning of the apical projection. Coelioxys moesta Cresson 



15 Abdomen with yellow or yellowish- white tegumentary bands or spots. 



16 

 Abdomen not thus ornamented. 22 



16 Pulvillus absent; mostly large bees; females with ventral scopa. Anthidium (9) 

 Pulvillus present. 17 



1 7 Dark green or blue, the abdomen with light bands. 1 8 

 Not metallic. 19 



1 8 Hair of vertex pale, of pleura black. Chelynia pulchra Crawford 

 Hair of vertex largely black, of pleura pale. Chelynia elegans Cresson 



