372 ERNEST A. BACK. 



Type. — University of Kansas. A single male specimen. 



Habitat. — Mendocino Co., Cal. (0. T. Baron). 



I have seen a specimen of this species that agrees perfectly 

 with the above description except that several of the occipito- 

 orbital bristles are black. 



Lestomyia sabulonum (PL X, fig. 1). 



Clavator sabulonum Osten Sacken, West. Dipt., 292, 1877. 



Lestomyia sabulonum Williston, Trans. Am. Ent. Soc, XI, 20, 

 PI. II, fig. 4, 1884. 

 %, 9- — Length 7-11 mm. — "Yellowish-gray; thorax with a geminate 

 blackish stripe; abdomen with a row of longitudinal blackish spots; 

 wings hyaline. 



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

 bosity; 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 similar, 

 but smaller, white bristles; in the female the latter bristles are very 

 thin and small. Antennae black; the first segment with white pile 

 beneath; second segment on the under side with a couple of black 

 bristles; occiput with yellowish bristles above, and with long soft 

 white hair 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-like fringe of pile before 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 

 almost reaching the posterior margin, in the middle of each segment; 

 a similar dark spot on each side of segments 2-6; the last segment of 

 the female polished brownish-black; in the male the hypopygium 

 black, polished, with long white pile. Wings hyaline, with hardly 

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

 black; femora at the base and tip, and base of tibiae red ; tarsi brown- 

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

 bristles are perceptible on the upper side, especially on the anterior 

 tibiae; in the female, the bristles are black; very few white ones are 

 visible." 



Type. — M. C. Z. The type series consists of a male and 

 female in coitu, and a second male with the body badly eaten 

 out. 



Habitat. — Crafton, near San Barnardino, Cal., March, on 

 dry, gravelly soil — type; Kern Co., Cal. 



The most striking feature of this species is the tuft of long 

 bristles on the ocellar tubercle, and those on the thoracic 



