104 ENTOMOLOGICAL NEWS [April, '20 



on second in male. Legs black, all tibiae yellowish testaceous. Wings 

 and calyptrae whitish. Halteres yellow. 



Each orbit with 4 or 5 bristles and a few hairs; cheek distinctly higher 

 than width of third antennal segment, the apex of latter about one-third 

 of the length from lower margin of face; arista short-haired. Acrostichals 

 irregularly two-rowed; lower stigmatal bristle long, directed downward. 



Abdomen of male longer than thorax, slender, cylindrical, basal hypopy- 

 gial segment globose, subequal in length to preceding segment, forceps 

 long, extending to base of fourth tergite, both forceps stout, slightly tapered 

 apically, the superior pair fringed on sides with minute hairs; abdomen of 

 female tapered apically, the fourth tergite with a rather dense fringe of 

 stiff bristly hairs at apex. 



Femora stout, mid and hind pairs with two or three long bristles on 

 basal half of antero- and postero-ventral surfaces and the hind pair with 

 two or three similar bristles on apical half of antero-ventral surface; in 

 addition to those bristles there are some shorter setulae between them 

 which are most noticeable in the male; fore and mid tibiae with the usual 

 bristles, hind tibia with three bristles, one antero-ventral, one antero-dor- 

 sal, and one postero-dorsal; hind tarsus with the basal segment about one- 

 third as long as tibia, a short setula near base on ventral surface. Lower 

 calyptra much larger than upper. 



Length, 3.5-4 mm. 



Type, male, and allotype, Musselshell, Montana, August 

 30 and 17, 1917. Paratypes, two males, Huntley, Montana, 

 July 23, 1917; one female. Miles City, Montana, July 21, 

 1915; one female, Bozeman, Montana, July 7, 1917; two 

 males, Saguache, Colorado, September 3, 1917 (A. K. Fisher). 



The type and allotype will be deposited in the collection of 

 the Montana Agricultural Experiment Station. Paratypes 

 will be deposited as follows: one male and one female, Illinois 

 State Natural History Survey; two males, U. S. Bureau of 

 Biological Survey; one male, Boston Society of Natural 

 History; one female, Academy of Natural Sciences of 

 Philadelphia. 



