l82 KANSAS UNlVKRSnV QUARTERLY. 



Abdomen with broad, cinereous pollinose bands and blackish reflec- 

 tions; first segment without marginal bristles (rarely aborted ones in 

 the male); second segment with two marginal bristles; third segment 

 with a marginal row. Claws of male elongate; tibia of hind legs on 

 the front side with a fringe-like row of bristles, a little longer on the 

 basal half. First posterior cell open, ending before the tip of the 

 wing. 



Onephalia pansa n. sp. 



Female. Thickly cinereous pollinose, with a faint yellowish tinge. 

 Front and face almost equally wide, the former very slightly narrower, 

 one-half the width of the head; silvery pollinose; frontal stripe 

 brownish; in addition to the frontal bristles there are many dark 

 hairs, especially near the vertex, and a row of very small bristles 

 along the orbits. Sides of faces silvery pollinose, as wide as the 

 depression, beset with many small, irregularly arranged bristles. 

 Facial ridges bare, except for some weak bristles above the vibrissas, 

 which extend from one-fourth to one-half the distance to the base of 

 the antennae. The ground-color of the face, and less preceptibly of 

 the front, except near the eyes, is testaceous, which is most apparent 

 at the facial depression and at the epistoma. Third joint of antennae 

 sometimes reddish at the immediate base, equal in length to the 

 second, or from one-fourth to three-fourths longer than the second. 

 Arista sometimes straight, but usually geniculate, though rarely are 

 the two aristas of a specimen bent at the same angle; second joint of 

 the arista from one to three times its width in length. Sides of 

 abdomen sometimes reddish or luteous; tip of abdomen red or not. 



Nineteen specimens, T,as Cruces, New Mexico (Coll. Towns., July 

 9—28). 



Three males, Las Cruces, New Mexico (Coll. Towns., May 8) 

 Magdalena Mts., New Mexico (F. H. Snow, Aug. 9500 ft.). West- 

 ern Kansas have the third antennal joint slightly more than twice 

 the length of the second and the second aristal joint three to four 

 times its own width; the front perceptibly narrowed toward the 

 vertex where it is more than one-third the width of the head. 

 Though two of these specimens show two weak median macrochaitce on 

 the first abdominal segment, I do not doubt that they are conspecific 

 with the females and the other male. 



Length, 10 — 12 mm. 



This species differs from Shiner's descriptions of Cnephalia hebes 

 and C. amcricana* in having the bristles on the sides of the face 

 arranged irregularly (not " reihenweise geordnet"); and from 



Reise der Nnvara, p. 32r. 



