March, I9i5.] SCHAEFFER : New DiPTERA. 67 



give a description of the species. The species is not given in Aldrich's 

 catalogue of North American Diptera, but is sufficiently charac- 

 terized in the table to entitle it to recognition. 



Erax subpilosus new species. 



Head grayish-white pollinose, beard and mystax white, occipito-orbital 

 bristles white. Thorax black, faintly grayish-brown pollinose, middorsal stripe 

 faint ; dorsum sparsely covered with short, black hairs, which are longer 

 apically. Scutellum with black hairs and bristles, some of which are white 

 apically. Pleurze faintly pollinose, covered not densely with moderately long, 

 white hairs. Abdomen black, first to third segments with black hairs, longer 

 at sides, fourth segment with long white hairs intermixed with black hairs, 

 which are directed outwardly, fifth segment white pollinose and with shorter 

 white hairs, sixth and seventh segments densely white pollinose ; apical mar- 

 gins of segments two to five grayish pollinose. Venter grayish-white pollinose 

 covered with long, white hairs. Hypopygium black, clothed with shorter, white 

 hairs. Wings pure hyaline. Legs entirely black, clothed with shorter and 

 longer white hairs. Length 22 mm. 



Beaver Creek Hills, Beaver Co.. Utah, two males. (Doll and 

 Engelhardt.) 



The first three segments of the abdomen are clothed with black 

 hairs, the fourth and fifth with white hairs, the hairs on the fourth 

 segment are longer and more numerous than in most of the species 

 but not as dense as in stamincus, rapax or pallid us. 



Erax californicus new species. 



Male. — Head grayish-white pollinose, mystax yellowish-white, beard white, 

 occipito-orbital bristles black. Thorax black, dark grayish pollinose, dorsal 

 stripes faint, dorsum with short, black hairs, which are longer apically. Scu- 

 tellum with white hairs, apical bristles black. Pleurae dark gray pollinose as 

 the thorax and with moderately long, white hairs. Abdominal segments widely 

 pale-grayish pollinose at sides, black and feebly shining along the middle, seg- 

 ments one to three with longer white hairs at sides, seginents four to seven 

 with sparse, shorter white hairs. Hypopygium black, clothed with sparse, short 

 white hairs. Wings with a very slight yellowish-brown tinge. Legs black 

 except the tibiae which are at base reddish, densely clothed with rather long, 

 white pile. 



Female. — Colored as the male but the white hairs on the legs are shorter. 

 The ovipositor is moderately long. Length 25-28 mm. 



Shasta Co., Cal., male and female received from George Franck. 



Another specimen, a smaller male from the same locality, has the 

 abdominal segments four to seven almost entirely uniformly greyish- 

 pollinose, otherwise it agrees with the larger specimen. 



