OSTEN SACKEN ON WESTERN DIPTERA. 293 



Yellowish-gray ; face whitish, with a tuft of white pile on the gibbosity ; 

 in the female with a few (I count six) black bristles above the mouth, 

 which I do not perceive in the male ; ocellar tubercle, in the female, with 

 a tuft of stiff, black bristles (I count eight); in the male, these bristles 

 are white, and the front shows on each side a row of similar, but smaller, 

 white bristles ; in the female, the latter bristles are very thin and small. 

 Antennoe black; first joint with white pile beneath; second joint on 

 the under side with a couple of black bristles ; occiput with yellowish 

 bristles above, and with long, soft, white hairs below. Thoracic dorsum 

 with a geminate brown stripe in the middle, and two broader stripes on 

 the sides, abbreviated long before the humeri; the fan-shaped fringe of 

 pile in front of the yellow halteres is white in the male, black in the 

 female. Abdomen yellowish-gray, with whitish-gray reflections ; an ill- 

 defined, elongated, darker spot, not reaching the posterior margin, in the 

 middle of each segment; a similar dark spot on each side of the segments 

 2-6 ; the last segment in the female shining brownish-black; in the male, 

 hypopygium black, shining, with long white pile. Wings hyaline, a 

 little less pure hyaline in the female, in which a strong lens shows 

 hardly perceptible vestiges of brown clouds on the cross- veins. Legs 

 black ; femora at the base and tip and base of tibiae red ; tarsi brownish ; 

 the spines on the tibiae in the male are mostly white ; some black spines 

 are perceptible on the upper side, especially of the front tibise ; in the 

 female, the spines are black ; very few white ones are visible. 



Rob. — Orafton, near San Bernardino, Cal., March, on dry, gravelly 

 soil. Two males and one female. 



PYCNOPOaON. 



I have never seen a specimen of this genus, and have to rely on 

 the statements of Dr. Loew (Linn. Ent., ii, 526). These statements con- 

 vince me that I have a species of this genus before me, or at least one 

 closely allied to it. The characters of the species are so well marked 

 that it will easily be recognizable. 



Pycnopogon cirrhatus n. sp., £.— Black; thorax with white hairs; 

 abdomen with recumbent, golden-yellow pile, especially dense on its 

 latter part ; femora black ; tibiae red ; middle tibiae before the middle 

 with a tuft of black pile. Length 8.5 mm . 



Head and face clothed with white pile ; some black bristles above the 

 mouth and also in the upper part of the occiput. Thorax black (the 

 dorsum is greasy in my specimen), with long, soft, white pile ; the usual 

 bristles black. Halteres lemon-yellow ; the fan-shaped tuft in front of 

 them rather dense, pale yellow. Abdomen black, shining, finely and 

 sparsely punctate ; segments, beginning with the second, clothed with 

 recumbent, silky golden-yellow hair, growing gradually more dense on 

 each subsequent segment ; this hair is less dense at the bases of seg- 

 ments 2-5 ; sides and under side beset with long, yellow hair. Femora 



