218 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



brevihirta Cockerell, 1907. Boulder, Colorado, June (W. P. Cockerell). Tab. 1. 

 Possibly the female of 0. cyaneonitens. 



* brevis Cresson, 1864. Rockj^ Mountains, Colorado. Tab. 4. 



Supposed male; Proc. Acad. Nat. Sci. Phila., 1897, p. 345. In Tab. 4 the male 

 would run to pumila, but is much larger, like enena, but cheeks with some black 

 hairs. 

 *bruneri Cockerell, 1897. Colorado Springs, Colorado (L. Bruner). Tab. 1. 

 Brilliant blue-green. 

 Male; Ann. and Mag. Nat. Hist., Oct., 1908, p. 330. The male has much coarse 



black hair on the clypeus, etc. 

 A new locality is Durango, Colorado, May 27, 1899 (Oslar). 

 Type.— Cat. No. 5806, U.S.N.M. 

 bucconis Say, 1837. Indiana. 



Same as Ashmeadiella bucconis. 

 *bucephala Cresson, 1864. Great Slave Lake, British America. Tab. 4. 

 *californica Cresson, 1864. Fort Crook, California (H. Ulke). 

 Female "shaped like 0. lignaria, but is at once distinguished from that species by 

 the black pubescence and the shape of the clypeus." The clypeus is rather 

 deeply emarginate. 

 *calla Cockerell, 1897. Olympia, Washington (Kincaid). 

 Bright green; pubescence of male nowhere mixed with black. 

 Paratype.—C&t. No. 6866, U.S.N.M. 



* canadensis Cresson, 18G4. Canada West (Wm. Saunders). Tab. 4. 

 cara Cockerell, 1910. Claremont, California (Baker). Tab. 8. 

 casta Cockerell, 1910. Claremont, California (Baker). Tab. 8. 



*cerasi Cockerell, 1897. Mesilla, New Mexico (Jessie E. Casad). Tab. 6. 



Female with hair of thorax above bright rust-red; tegulse and ventral scopa black. 

 Paratype.— Cat. No. 3708, U.S.N.M. This specimen was determined by Cockerell 

 but not designated as a type by him. Titus considers it as a paratype. 

 *clialybea Smith, 1854. St. John's Bluff, East Florida. 



Steel blue; margin of female clypeus lobed in middle, the apex of the lobe emar- 

 ginate, margin on each side of lobe crenulated. 

 Occurs in Texas; see Univ. of Colorado Studies, vol. 5 (1907), p. 37. 

 *chlorops Cockerell and Titus, 1902. Trout Spring, New Mexico (Cockerell). 

 Tab. 2. 

 Allied to 0. canadensis. 



New description: Bull. Amer. Mus. Nat. Hist., 1906, p. 448. 

 Type.— Cat. No. 14480, U.S.N.M. 

 clarescens Cockerell, 1911. Claremont, California (Baker). 



Female with ventral scopa black; hair of pleura and meta thorax white; legs 

 metallic. 

 *cobaltina Cresson, 1878. "Nevada, California (H. Edwards, Behrens)." Tab. 4. 

 Brilliant deep blue or purple. 

 Baker has taken it at Claremont, California. 

 *cognata Cresson, 1864. Illinois (E. Norton). 

 coUinsise Robertson, 1905. Illinois (Robertson). 



This is the insect earlier described by Robertson as the male of 0. major. 

 *coloradella Cockerell, 1906. Boulder, Colorado, June 4 (W. P. Cockerell). Tab. 1. 

 Allied to C. atriventris. 



Recent studies indicate that this is apparently a variety of 0. hesperella. 

 coloradensis Cresson, 1878. Colorado (Ridings, Morrison). 



"Ventral scopa white or yellow." Apical margin of female clypeus coan-ely crenu- 

 lated. Also found in Ormsby County, Nevada (Baker), and at Peachland, British 

 Columbia, Aug. 2 and 6, 1909 (J. B.'Wallis). It is doubtful whether 0. hypochry- 

 sea rohweri can be separated from this; epecimens from Flagstaff, Arizona, are 

 intermediate. 



