snow: diptera of Colorado and new mexico. 239 



with a blackish ring; the hind tarsi black. Wings hyaline, the stigma 

 faintly yellowish. — Length scarcely 6 mm. 



A single female, Magdalena mountains. N. M. (Aug. ). 



The species is easily recognizable by the yellow markings of the 

 thorax, the yellow scutellum, the broadly interrupted abdominal 

 band, the lack of a dark costal border of the wings, and by its small 

 size. 



Allograpta obliqua Say. 



Many specimens, bearing labels as follows: Manitou Park, Colo. 

 (Aug.); Colorado Springs; Cheyenne Canyon, Colo. (July); Colorado 

 (Gillette, No. 1722); Magdalena mountains, N. M. (Aug.); Albu- 

 querque, N. M. (Aug.); New Mexico (Gaumer). Occurs accross the 

 continent and into South America, and has been taken above timber 

 line in Colorado. 



Mesogramma marg-inatum Say. 



Manitou Park, Colo. (July, Aug.); Colorado Springs and Garden 

 of the Gods, Colo. (July); Colorado (Gillette, Nos. 1650, 1699); 

 New Mexico (Gaumer); Las Cruces, N. M. (Townsend, June 3, 5; 

 Aug. 21); Albuquerque, N. M. (Aug.); Magdalena mountains, N. M. 

 (July and Aug.). A very common species all over North America. 



Mesograrama politum Say. 



Two males, Magdalena Mountains, N. M. (Aug.V — -Has a very 

 wide distribution in this continent. 



Sphaerophoria cylindrica Say. 



Numerous specimens showing much variation in the color of the 

 abdomen, Manitou and Estes Parks, Colo. (July, Aug.); Colorado 

 Springs and Garden of the Gods, Colo. (July and Aug.); Colorado 

 (Gillette, Nos. 1666, 1685, 1709, 1722); New Mexico, (Gaumer); 

 Las Cruces, N. 1\L (Townsend, Apr. 8); Magdalena mountains, N. 

 M. (Aug.). — Occurs from east to west. 



Pelecocera ■willistoni Snow, Kans Univ. Quart., HI, p. 187. 



The two types were taken in the Magdalena mountains, N. M. 



(Aug.). 



Baccha clavata Fabr. 



One male, Albuquerque (last week of Aug.); one female. Las 

 Cruces, N. ]\L (Townsend, June 7). — A southern species from Florida 

 to California, and extending into South America. 



