OSTEN SACKEN ON WESTEEN DIPTERA. 293 



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

 ia 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. 

 Antennae 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 iu 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 tibite ; in the 

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



Eal). — Grafton, near San Bernardino, Gal., March, on dry, gravelly 

 soil. Two males and one female. 



Pycnopogon. 



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. 



Pycnopog-on 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°^"^. 



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 specinien), 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 



