SNOW: DIPTERA OF COLORADO AND NEW MEXICO. 227 



pertain mostly to abdominal color differences and the relative length 

 of the antennal joints. The study of a large number of specimens 

 will undoubtedly lead to the rejection of some of the specific names 

 now in use. 



Ciirysotoxum integrum Will. 



A female from the Magdalena mountains, N. M., agrees best with 

 the description of this species. C. derivatuin, laterale and integrum 

 are all very intimately related. — A southwestern species. 



Paragus bicolor Fabr. 



Two specimens, Manitou Park, Colo. (August), and one from Estes 

 Park, Colo. (August), belong to Schiner's variety tceniatus. One, 

 marked •'Col." (Gillette, No. 1203), is nearest variety ruficauda. A 

 specimen from Las Cruces, N. M. (Townsend, August 19), is variety 

 testaceiis. This species occurs across* the continent as well as in 

 Europe. 



Paragus tibialis Fall. 



Two specimens, Colorado Springs (July and August); three speci- 

 mens, Colorado (Gillette, Nos. 1624, 1686, 169 [). A species with a 

 wide range like the preceding. 



Pipiza pistica Will. 



Two males and a female, Magdalena mountains, N. M. (August), 

 and one male, Manitou (July), agree well with the description drawn 

 from Connecticut specimens. 



Ohrysogaster nigrovittata Loew. 



One male and two females, Colorado (Gillette, Nos. 413, 1204, 

 1700). The species is known on'y from the west. 



Ohrysogaster bellula Will. 



One specimen, Magdalena mountains, N. M. (August); three speci- 

 mens, Colorado Springs (August). Also a western species. 



Ohilosia lugubris Will. 



A female from Colorado (Gillette, No. 1689), agrees sufficiently 

 well with the description based on two males from California. The 

 third joint of the antennae is obtusely rounded at the end; the face is 

 shining, bare, except for some sparse light pile along the orbits; the 

 abdomen is everywhere equally shining; no yellow is apparent at the 

 knees. 



As the name lugubris is preoccupied by Zetterstedt for a Swedish 

 Chilosia, I suggest that the specific name willistoni be conferred on 

 this species. 



