snow: cnephalia and its allies. 183 



Kowarz's description of hebcs in having five cinereous stripes on the 

 thorax instead of four. The female, too, is often testaceous on the 

 sides and tip of abdomen. 

 Cnephalia ruficauda Towns. 



Pseiidofi^onia nificauiia Towns. Canad. Entom. XXIV, p. 66. 



Pseudogouia obsoleta Towns. 1. c. 



Male and female. In appearance markedly similar to the preced- 

 ing. The size is the same, the color is darker owing to a thinner 

 covering of cinereous pollen. Front widely on the sides brassy-yel- 

 low pollinose, bristles much coarser and longer than in the preceding;, 

 front of the male one-third of the width of the head, of the female a 

 little wider, in both se.xes perceptibly narrowed toward the vertex.. 

 The facial depression is wider than in pansa and at its widest is 

 nearly one-half of the facial width; its ground color is black above 

 the epistomata directly beneath the antennae; sides of the face beset 

 with small black bristles arranged in two rows, one of which follows, 

 the orbit and the other lies near the facial ridges diverging below 

 towartls the orbital row. In the males the third joint of the antennse 

 is from one and one-third to four times the length of the second joint,, 

 with an average of two and one-third times; in the females the third, 

 joint is from one and one-half to one and one-third times the second. 

 In the males the second aristal joint is from three to six times as long as- 

 wide, with an average of four times; in the females it is from two and 

 one-half to three times its width. In both sexes the arista may be 

 strongly geniculate or not at all, or the arista of one antenna may 

 be geniculate, while that of the other antenna may be perfectly 

 straight; the arista is generally incrassate in the male and feebly 

 so or not at all in the female. In the males the bristles of the facial 

 ridges ascend above the vibrissiii from five- tenths to eight-tenths the 

 length of the ridges, with an average of six-tenths; in the females 

 they ascend from three-tenths to six-tenths the length of the ridges, 

 average four-tenths. Both sexes vary as to the amount of red on the 

 fourth abdominal segment, a few specimens showing not a trace and 

 others a narrow ring at the tip, while not infrequently the ground 

 color of nearly the whole segment is red. 



Ten males and two females, Illinois (Prof. Forbes, Nos. 14,504, 

 14,566, 14,460 — Coll. Townsend), seven males and one female. 

 Southern Illinois (Charles Robertson, Nos. 1630, 1634, 2922, 5444, 

 6430, 6432 — Coll. Williston); one male, Riley county, Kansas, (F. 

 •A. Marlatt, in June — Coll. Towns.); two females, White Mountains 

 (Williston); one female, Newton, Mass., (Williston, in July); one 

 male. North Carolina, (Coll. Williston); one male, New York,. 

 (Comstock); two males, Brookings, South Dakota, (Aldrich). 



