366 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



tarsi except the apical joints, yellowish; middle joints of hind tarsi piceous; 

 hind coxal spur small, slender, inconspicuous, pointing backwards, not down- 

 ward as in other species. Wings cinereous hyaline; stigma luteous; last section 

 of fourth vein angulated at its proximal quarter; of the fifth straight. 



Holotype, male, No. 858, Mus. Calif. Acad. Sci., 

 July 25, 1909, 6000 feet elevation, J. C. Bridwell, col- 

 lector. 



Type locality, Horse Lake, Oregon. 



In this species the spur is very slender and difficult to 

 detect owing to the long pile. 



24. Cnemodon rita, new species (Fig. 21) 



Habitat: Oregon! California! Coxal spur stout, 

 pointing downwards; antennae entirely black or third 

 joint yellow below basally; pleurae black pilose. 



Male: Length, 5.5 to 6.5 mm. Face and frons shining bluish black, black 

 pilose; face receding, almost straight; frons considerably swollen, with a small 

 elongate depression above the antennse, not at all opaque. Antennae black, 

 the apical two joints appearing brownish; third joint as broad as long, sub- 

 rectangular, the end almost evenly rounded, sometimes yellow basally, below; 

 arista black; pile of eyes brownish, lighter below; post orbital pile white on lower 

 half, black above; occipital cilia black. Thorax and scutellum shining bluish 

 black with light pile, the humeri, pleurae and scutellum with black pile; scutellum 

 without apical groove. Abdomen shining purplish black with the usual areas 

 opaque; pile black, with the usual areas whitish or cinereous pilose; hypo- 

 pygium black pilose. Legs black; knees, tips of front four tibia? and first three 

 joints of their tarsi, yellowish; hind trochanteral processes moderately short, 

 stout, somewhat pointed; middle coxal processes rather stout, long, pointed; 

 middle tibial production gradually widening from base, terminating abruptly. 

 Wings cinereous hyaline; stigma luteous; last section of fifth vein straight. 



Holotype, male, No. 859, Mus. Calif. Acad. Sci., 

 July 14, A. L. Lovett, collector. Paratypes, three males, 

 Huntington Lake, Fresno Co., Calif., July 17, 1919, E. 

 P. Van Duzee collector, and one male, same place, July 

 20, in Mus. Calif. Acad. Sci., and in collection of the 

 author. 



Type locality, Rock Creek, Oregon. 



25. Cnemodon coxalis, new species (Figs. 15, 52) 



Habitat: Ontario! Wisconsin! Male: Length, 6.5 to 7.5 mm. Face and 

 frons shining bluish black, black pilose, middle of the face whitish pilose; 

 vertical triangle whitish pilose behind; occipital cilia black; sides of face nar- 

 rowly white pollinose. Antennas black; third joint yellow below, longer than 

 broad, end almost evenly rounded. Eyes blackish pilose. Thorax and scutel- 

 lum shining brassy black, with long white pile, appearing yellow in some 

 lights. Abdomen shining black, the usual areas opaque; shining areas inclined 

 to be cupreous; pile short, black, the usual areas with white pile. Legs black; 

 tips of all the femora, front tibiae except a broad pre-apical piceous band, base 



