Vol. IX] COLE & LOVETT—NEW OREGON DIPTERA 233 



This species is better placed in Cyrtopogon, with which it has 

 several characters in common, but it might well be made the 

 type of a new genus. Osten Sacken noticed that the female 

 was not typical and the male has characters that separate it 

 more definitely. The fringe on the costa of the wing is not 

 found on any of the other species of Cyrtopogon known to us, 

 and the antennae are more like those of Hcteropogon. 



18. Cyrtopogon infuscatus Cole, new species 



(Plate 17, fig. 16) 



Male : Length 10 mm. Head, antennae, proboscis and palpi black ; head 

 silvery gray-pollinose ; frons with long erect black pile ; facial callosity 

 very large, bulging from oral margin to base of antennae ; clothed with 

 long white pile ; pile of occiput mostly white, that on lower corners of face 

 and lower occiput black. 



Thorax and scutellum black, thickly gray-pollinose ; some black pile in 

 front of wings; pile of pleura white, including metapleural tuft; dorsum 

 with sparse black pile and black bristles; scutellum with long fine black 

 bristles, hair-like and up-curving; halteres with black stem and yellow 

 knob. 



Abdomen blue-black with white pile, much longer on sides of first three 

 segments ; sides of first segment and posterior lateral margins of second 

 to fifth white pollinose ; sixth and seventh pollinose except a dorsal 

 triangle ; genitalia black, gray-pollinose and short black pilose. 



Legs entirely black; femora and tibiae with rather long white pile and 

 black bristles; short golden pile beneath tarsi, on tips of hind tibiae and on 

 all but base of front tibiae; a large part of the wing infuscated (Fig. 16a). 



Holotype (No. 483), male, collected at Pamelia Lake on 

 Mt. Jefferson, ahitude 3,000 feet, July 12, 1907 (J. C. Brid- 

 well), in the Museum of the California Academy of Sciences. 



This species is very near evidens and rejectus, differing from 

 the former in the white pile of the face and in the extent of the 

 pollinose crossbands on the abdomen. It may prove to be the 

 male of rejectus O. S. 



19. Cyrtopogon perspicax Cole, new species 



Male: Length 10 mm. Black, thickly pilose species; third antennal joint 

 red ; scutellum convex and shining. 



Head black, thinly grayish yellow pollinose ; mystax thick and black, the 

 pile reaching 1:o base of antennae ; pile in middle of frons whitish, that of 

 upper occiput black; first two antennal joints black, the second yellow at 

 tip, third reddish yellow except extreme apex; style about one-third length 

 of third joint; beard and pile on proboscis white. 



Thorax black, brown pollinose, lighter in some places than others and 

 forming a peculiar cross-shaped design on the dorsum, outHned behind by 

 whitish pollen ; scutellum and pre-scutellar callosities shining black, the 



