% 



REVISION OF THE GENUS EXETASTES — CUSHMAN 289 



Thorax shining, with moderately dense punctation, finer and sparser 

 dorsally; notauli broadly impressed throughout; scutellum narrowly 

 triangular, rather weakly convex in profile ; propodeum only moderately 

 convex both transversely and in profile, irregularly reticulate rugose, 

 with median trace of apical carina; spiracle elongate, situated about 

 half its length above the distinct pleural carina. 



Legs slender ; inner hind calcarium distinctly more than half as long 

 as basitarsus; apical joint of tarsus much shorter than third. 



Wings: Apical abscissa of radius slightly curved basally, barely 

 a half longer than basal abscissa ; second discoidal cell narrow ; second 

 recurrent rather weakly curved above and hardly two-thirds as long 

 as basal abscissa of subdiscoideus; nervulus slightly postf ureal; 

 abscissula barely twice as long as intercubitella. 



Abdomen slender, strongly compressed apically; first tergite nearly 

 three times as long as broad at apex, second fully a half longer than 

 broad at base; o-sdpositor short, sheath less than half as long as first 

 tergite. 



Body entirely black except reddish apex of clypeus and along 

 sutures of abdomen; antennae black; palpi dark brown; wings faintly 

 stained, venation dark brown; legs black; front and middle femora in 

 front toward apices and hind femur except at apex ferruginous; joints 

 2-4 of hind tarsus wliitish. 



Male. — Malar space slightly shorter and ocelli slightly larger; 

 antenna 56-jointed; face, clypeus, malar space, and mandibles yellow; 

 maxillary palpi stramineous; apices of propleura, tegulae basally, 

 paired spots on mesosternum, all coxae, and front and middle tro- 

 chanters beneath yellow; front and middle femora pale ferruginous, 

 their tibiae and tarsi stramineous to yellowish; hind tibia reddish at 

 base; otherwise essentially like female. 



Tyye locality. — Beaver Creek, Mont., 6,300 feet. 



Type. — University of Kansas. 



AUotype. — Canadian National Collection. 



Remarks. — One of each sex, the holotype female taken in August 

 1913 by S. J. Hunter; the allotype male, Waterton, Alberta, July 14, 

 1923, H. L. Seamans. 



33. EXETASTES NIGRIBASIS, new species 



Structurally almost identical with subimpressus , but with abdomen 

 beyond first tergite in female and beyond second in male entirely 

 ferruginous. Antenna in female nearly as long as body, 55- to 58- 

 jointed, attenuate apically. Hind femur entirely ferruginous. 



The male differs from the female as does that of subimpressus 

 except that the malar space and sternum are entirely black and the 

 front and middle femora are more or less piceous behind. 



Type locality. — Harney Peak, S. Dak. 



