1909] Rohberflies of the Genus Asilus 151 



Beard gray; occipito-orbital bristles gray as are all the hairs of the 

 occiput. Palpi and proboscis black, the former with gray hairs. 

 Thorax gray, often with a yellowish tinge above, mid-dorsal stripe 

 black. Wings yellowish in the male quite dark from the base of the 

 first submarginal cell, especially along the costal border; in the female 

 the wings are much lighter than in the male and in some specimens 

 these are practically hyaline. Legs brown, femora somewhat variable 

 but usually distinctly darker anteriorly, tibiae darkened at the apexes, 

 tarsal segments mostly dark, but the first on each leg lighter except 

 at the apex. Abdomen brownish black; on the posterior margin of 

 each segment is a white band which is preceded by a row of white 

 bristles which are largest anteriorly. Male forceps black and shining, 

 upper forceps swollen, thickest beyond the middle of their length, 

 oviduct long and slender but not inchiding the seventh abdominal 

 segment. 



The description and drawings were taken from the type specimens 

 which are in the Francis Huntington Snow collection of the University 

 of Kansas. Other specimens from western Washington collected by 

 H. K. Morrison, -Vernon, B. C, by E. P. Venables, Goldstream, B. C, 

 b}- R. V. Harvey. 



Asilus auriannulatus Hine. 



General color shining blue-black with uniform pale brown wings and 

 black and yellow legs. The second, third and fourth segments of the 

 abdomen each with a golden yellow annulus at the apex. Length 

 14 to 17 millimeters. 



Front and face rather narrow, the latter covered with golden 

 yellow pollen between the callosity and the antennae, callosity slightly 

 elevated, m3^stax black, beard white, third segment of the antenna 

 about as long as the other two together, style shorter than the remain- 

 der of the segment; thorax dark in ground color, clothed with pollen 

 which is denser in some places than in others, mid-dorsal stripe opaque 

 black, narrowly divided on the anterior part; sctitellum with several 

 black bristles at its apex; wing uniformly pale brown all over with a 

 slight intensity of coloration on the margin of the second vein near the 

 middle of its length. Legs black and yellow, a preapical ring on each 

 femur, all the tibiae except at apexes and bases of the tarsal segments 

 yellow, other parts black; hind femora somewhat variable in that the 

 yellow is likely to increase at the expense of the black; halteres yellow. 

 Abdomen shining blue-black, second, third and fourth segments each 

 with a golden yellow annulus at apex not preceded by a row of bristles ; 

 eighth segment below not widened but furnished with a conspicuous 

 tuft of erect hair. Genitalia of both sexes shining black, of the male 

 somewhat wider than the abdomen when viewed from above and 

 about as long as the seventh and eighth segments combined. 



Several specimens of both sexes taken in the Hope Mountains of 

 British Columbia by R. V. Harvey and R. S. Sherman of Vancouver, 

 during:, the first part of ]n\y. Also from Kalso, B. C, collected by 

 R. I*:. Currie, western Washington, by H. K. Morrison, Humboldt 

 Couhty, California, by H. S. Barber, and from several other places in 

 California and Washington. 



