220 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



felti CocKERELL, 1911. Earner, New York (E. P. Felt). 



Allied to 0. densa. 

 florissanticola Cockerell, 1906. Florissant, Colorado (Cockerell). Tab. 2. 

 foxi Cameron, 1901. "Sta. Fe Mts, New Mexico, " but really Mexican. 



Male 8 mm., said to be allied to texana and subfasciata; legs largely metallic, 

 frigida Smith, 1854. Hudson Bay. 



A black species, the female with a very large head; ventral scopa black. 



Notes on type: Trans. Amer. Ent. Society, vol. 31, p. 332. 

 *fulgida Cresson, 1864. Rocky Mountains, Colorado. Tab. 1. 



A bright green species. 



Male; Ann. and Mag. Nat. Hist., Nov., 1907, p. 445. 



New localities are Ouray, Colorado (H. F. Wickham), Denver, Colorado (Oslar), 

 and South Park, Colorado (Oslar.) 

 gabrielis Cockerell, 1910. San Gabriel Mountains, California, 3,000 feet. (Grinnell). 



Tab. 8. 

 gaillardiae Cockerell, 1906. Boulder, Colorado (W. P. Cockerell). Tab. 1. 



Visits Gaillardia in July. Ventral scopa black. 

 *gaudiosa Cockerell, 1907. Boulder, Colorado, April (Edna Baker). Tab. 3 



Brilliant golden green. Also at Florissant; see Ann. and Mag. Nat. Hist., Oct., 

 1908, p. 330. The male type had the vertex, front, and thorax above with a 

 strong suffusion of coppery-red or almost crimson; after four years, although the 

 specimen was kept in the dark, this has faded to golden, 

 georgica Cresson, 1878. Georgia (Morrison). Tab. 4. 



Female with clypeus carinate and mandibles tuberculate; ventral scopa yellowish. 

 giliarum Cockerell, 1906. Florissant, Colorado (Rohwer). Tab. 2. 

 *globosa Cresson, 1864. Great Slave Lake, British America. 



A small robust black species. 

 globosiformis Cockerell, 1910. Steamboat Springs, Colorado (Cockerell). 



Male entirely black with white. pubescence. 

 *grandior Cockerell, 1897. Olympia, Washington State, May (Kincaid). 



Resembles 0. pascoensis; clypeus dull and roughened (in pascoensis shiny, with 

 well-separated punctures). 



Paratype.— Cat. No. 6869, U.S.N.M. 

 granulosa Cockerell, 1911. Mountains near Claremont, California (Baker), 

 grindelise Cockerell, 1910. Eldora, Colorado (T. and W. Cockerell). 

 grinnelli Cockerell, 1910. Strawberry Valley, San Jacinto Mountains, California 



(Grinnell). 

 hendersoni Cockerell, 1907. Arapahoe Peak, Colorado (Rohwer). Tab. 1. 



A high alpine species. 

 hesperella Cockerell, 1906. Boulder, Colorado (W. P. Cockerell). Tab. 1. 



Ventral scopa yellowish-white. Allied to 0. albiventris. 



I have taken it at flowers of Cirsium, June 26. 

 hudsonica Cresson, 1864. Hudson Bay Territory. 



A black species, 

 hypochrysea Cockerell, 1906. Florissant, Colorado (Rohwer). Tab. 2. 



Ventral scopa pale orange; anterior margin of clypeus (female) with a median 

 tridentate elevation. 



Also at Claremont, California, where it is variable (Baker). 

 * hypochrysea rohweri Cockerell, 1907. Boulder, Colorado (Rohwer). Tab. 1. 



Larger, with the mesothorax more sparsely punctured. 



Also at Flagstaff, Arizona, at flowers of Iris, June 11, 1909 (F. C. Pratt). 



Very close to 0. coloradensis (which also occurs at Boulder, collected by W. P. 

 Cockerell), but the mesothorax is shining steel blue (blue-black and dull iu 

 coloradensis), and sparsely punctured about the middle. 



The two species are very doubtfully distinct. 



