snow: DIPTERA of COLORADO AND NEW MEXICO. 24I 



Mexico (Gaumer). The species resembles comstocki, but is very 

 distinct in its more protuberant face, more dull coppery black color 

 of body, wings infuscated at base, and greater size. In the latter 

 respect there is considerable variation, the smallest individual 

 measuring 9.5 and the largest 14 mm. 



The species was described from a single male from Arizona. In 

 the female the eyes are rather thickly pilose; the front is somewhat 

 narrowed above, chestnut colored, sometimes darker, pile mostly 

 black, on each side with a well marked concentric groove. 

 Volucella avida O. S. 



Ten males and seven females, Magdalena mountains, N. M. (Aug., 

 9,000 ft.). Found in company with the two preceding species. 



Volucella isabellina Will. 



A female from Las Cruces, N. M. (Townsend, July 12). The 

 type was from Arizona. 

 Volucella satur O. S. 



Two males, Colorado (F. H. Snow; Gillette, No. 788); one fe- 

 male, Estes Park, Colo. (Aug.); a male and a female, Magdalena 

 mountains, N. M. (Aug.); nine males and two females. New Mexico 

 (Gaumer). — .A. western species. 

 Volucella tau Big. 



One male, Colorado (F. H. Snow); one female. New Mexico 

 (Gaumer). — Southwestern. 

 Volucella obesa Fabr. 



One specimen. New Mexico (Gaumer).— Throughout the tropical 

 regions of America. 

 Volucella fasciata Macq . 



Two females, Colorado, and Manitou Park, Colo. (July). — A west- 

 ern and southern species. 

 Volucella haagii Ja?nn. 



Twenty males and twenty-eight females, Magdalena mountains, N. 

 M. (July, Aug., 7,000 to nearly 10,000 ft.). Taken in company with 

 comstocki, anna, and avida. — A southwestern species. 

 Volucella apicifera Towns., MS. 



A typical specimen. Las Cruces, M. M. (Townsend, Apr. 7). A 

 large light colored species with the distal half of the third and all of 

 the fourth abdominal segment, black. 



Oopestylum marginatum Say. 



Colorado (F. H. Snow; Gillette, Nos. 770, 788); Manitou Park, 

 Colo. (Aug.); New Mexico (Gaumer); Las Cruces, N. M. (Townsend, 



