Occasional Papers of the Museum of Zoology 7 



6. Body black, face just beneath the antennae shining black. 



nitidifacics Hine 

 Body pale, face entirely yellowish pollinose astutus Williston 



Asilus platyceras n. sp. 



Total length 14 to 16 millimeters. Dark-colored all over 

 without color markings. Alystax black above, pale straw- 

 color beneath. Bristles of the mesothoracic dorsum and the 

 scutellum black. 



Antenna black, third segment rather short, widest at mid- 

 dle of its length, arista shorter than its segment, beard white, 

 occipito-orbital bristles black ; mesothoracic dorsum black- 

 haired, posteriorly with numerous long, black hairs and bris- 

 tles; scutellum with numerous short, black hairs on its disc 

 and a row of long, black bristles and hairs on its margin ; 

 wings gray-hyaline, extreme base and region of the basal cells 

 nearly transparent ; legs black with gray pilosity and black 

 bristles ; inner sides of the tibiae and tarsi furnished in most 

 specimens with glistening reddish pile, more evident from some 

 views than others. Abdomen dark, nearly uniformly gray 

 pollinose and quite thickly gray pilose. Male genitalia shining 

 black from side view, superior appendages slightly longer than 

 abdominal segments six and seven, slender, of uniform width 

 and directed nearly straight backward. From dorsal view, 

 shghtly narrowed to apical third and from thence more rap- 

 idly narrowed to apex. Ovipositor shining black, conical and 

 about equal in length to abdominal segments six and seven. 



Male type and allotype collected at Lake Cushman, Mason 

 County, Washington, August 6, 1919, by F. M. Gaige. In the 

 University of Michigan Museum of Zoology. Four paratypes 

 in the same museum were collected at the same place between 

 July 4 and August 6, 1919. Two paratypes in my collection 

 from the same locality were taken August 8, 1919. 



