322 The Ohio Journal of Science [Vol. XVIII, No. 8, 



I 



Mystax white, very small, leaving a long distance between it and 

 the base of the antennae, beard white and sparse, posterior orbital 

 bristles all ]3ale; thorax lightly gray pollinose with black bristles dorsally, 

 two black bristles on the posterior margin of the scutellum ; legs yellowish 

 brown, darker in places on the femora, bristles of the legs largely pale, i 



but some black ones on the tibiae and tarsi; wing hyaline, feintly gray 

 on the hind margin and at the apex; abdomen dark with pale bristles. 

 Genitalia dark brown, shining in both sexes. 



Holotype male from San Diego, California, June 30, 1913, 1 



collected by E. P. Van Duzee; in the author's collection; a 

 female with the same data, a male from Los Angeles County, 

 California, collected by Coquillett, a male and female from 

 Claremont, collected by Baker, and a male and female from 

 Kerryville, Texas, collected by F. C. Pratt. 



This species differs from A. gracilis in the much darker color 

 of the whole body. The legs are brown instead of yellow and 

 the mystax is white and not straw colored. 



