Vol. XI] COLE AND LOVBTT—LIST OF OREGON DIPTERA 255 



321. Cyrtopogon praepes Loew 



Big Lake, VII-20 (Bridwell); Hood River, VI-13 

 (Cole) ; Burns, V (Thompson), a series which differs from 

 the typical form in having the middle of the hind tibia? red. 



322. Cyrtopogon princeps O. S. 



Subalpine regions of Mt. Jefferson, VII-20 (Bridwell) ; 

 Horse Lake, 6,000 feet, VII-25 ; Mackenzie Ridge, 6,000 

 feet, VIII-1 (Bridwell). 1919, Proc. Cal. Acad. Sci., Ser. 

 4, IX, p. 234. 



323. Cyrtopogon rejectus O. S. 

 Dee, VI-17 and Parkdale, VI-12 (Cole). 



324. Cyrtopogon sudator O. S. 

 Parkdale, VI- 18 (Cole) ; Hood River, V-14 (Lovett). 



325. Cyrtopogon thompsoni Cole, new species 

 Black, gray pollinose, with distinct black thoracic stripes; 

 yellowish and white pile mixed with black. 



Male : Length 1 1 mm. Face and frons whitish pollinose, 

 the ground color more or less obscured. Black pile on sides 

 of face on upper occiput next to eye margin and along lower 

 occiput, cheeks, and oral margin. Pile of center of face and 

 frons long and whitish. Antennas black, the arista rather 

 short and blunt; white pile below on first joint, a long black 

 bristle under second joint. Occiput and head below with 

 long, white pile. 



Dorsum of thorax rather thinly gray pollinose, white 

 pilose anteriorly and posteriorly, black across the middle. 

 The two dorsal vittas are narrow and distinctly separated, 

 gray-black, somewhat shining, as are the side spots. The 

 space in front of scutellum more or less destitute of pollen 

 in this specimen. Scutellum slightly flattened on disk but 

 with scarcely any pollen and thickly covered with long, erect, 

 pale yellowish pile. Pleura gray pollinose, with some whitish 

 pile on the meso- and sternopleura ; a tuft of pile in front 

 of the halteres. Halteres yellow. Whitish bristles on pre- 

 scutellar callosities, the other thoracic bristles black. 



