AMERICAN DIPTERA. 49 



53. Eristali!>> hirtus Loew. 



San Francisco Mt., Arizona, Jnly 15. One male and two females 

 (two coll. by Cordley) ; also one male, Manitou, Colo. (F. Marlatt), 

 September 1. These specimens all show the light yellow triangles 

 of the second segment very plainly. The face in the females is moi-e 

 yellowish, especially the pile of face and front ; the hind femora of 

 female are yellow at base. All have the whitish yellow hind margins 

 of second to fourth segments distinct. 



54. Eristalii^ latifron;^ Loew. 



Las Cruces, N. Mex., two females, April 8 and 9 ; three males 

 April 8, and one male June 5. One female. La Vega de San Jose, 

 N. Mex., August 4 ; one male, Turkey Tanks, Arizona, July 17 ; 

 also one male, apparently this species, from San Francisco County, 

 Cal. (Acad. Sci.). The scutellum is translucent brownish yellow. 

 Otherwise these agree well with Williston's description. 



Var. — I have ten female specimens from Las Cruces, N. Mex., 

 taken April 8 to June 28, and one female from Riley County, Kans. 

 (F. Marlatt), September, which constitute a distinct series that I 

 cannot refer to any other species. They differ from the others in 

 having a faint but distinct brown cloud on middle of wings, the 

 anterior base of wings being more or less flavous, and in having the 

 yellow spots of second segment wholly obsolete or very obscure yel- 

 lowish brown. One specimen in this series shows the spots pale yel- 

 lowish, especially laterally, while one female (Vega de San Jose), 

 that I included in the normal series, has the wings with a distinct 

 brownish flavous cloud. 



55. Eristalis teuax Linn. 



Washington, D. C, numerous specimens. May. Guanajuato, 

 Mex. (A. Duges), one male ; California, three specimens (Cal. Acad. 



Sci. ). 



The scutellum, which is yellowish and yellowish pilose, is omitted 

 from Williston's description. 



In all my collecting in the valley of the Rio Grande in southern 

 New Mexico, I did not find this cosmopolitan species (up to June, 

 1893). It is also apparently absent from the island of Jamaica. 



56. Eristalis transversus Wied. 



Constantine, Mich., three males and two females, August 24-31. 

 Dixie Landing and Roslyn, Va., two females and one male, August 



TRANS. AM. ENT. SOC. XXII. (7) MARCH, 1895. 



