310 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



front margin subtruncate, hind margin obtusangulate; prozona longi- 

 tudinal (male) or quadrate (female), only'a little longer than the densely 

 punctate metazon a. Prostemal spine rather long, erect, subpyramidal, 

 not very blunt, its anterior face vertical ; interspace between mesoster- 

 nal lobes fully twice as long as broad (male) or a little longer than 

 broad (female). Tegniina surpassing a little the hind femora, rather 

 broad, tapering considerably in the apical half, brownish fuscous, with 

 a row of dusky quadrate spots down the proximal half of the discoidal 

 area, but sometimes wholly immaculate. Wings hyaline, glistening, 

 the veins in the apical and anterior regions fuscous. Legs yellow, 

 tinged with dull orange, the hind femora faintly bifasciate above 

 internally, and with the upper exterior cariua black; hind tibiae 

 normally glaucous, paler and dull at the apex, sometimes uniform 

 red, the spines pallid, black apically, ten to eleven, rarely twelve, 

 in number in the outer "series. Extremity of male abdomen distinctly 

 clavate, but little recurved; supraanal plate triangular, with thickened 

 feebly upraised edges and a coarse percurrent median sulcus; furcula 

 consisting of a pair of short, divergent, flattened, tapering, often un- 

 equally tapering fingers, extending over the supraanal plate by hardly 

 more than the length of the last dorsal segment; cerci rather small, 

 strongly compressed, bent inward, nearly equal throughout but smallest 

 mesially, truncate at tip; subgenital plate moderately broad, subequal. 

 longer than broad, with nearly even lateral margins, entire and sub- 

 tuberculate at tip, broadly rounded as viewed from above. 



Length of body, male 28.5 mm., female 26 mm. ; antennae, male 12.5 

 mm., female 10.5 mm. ; tegmina, male 24.5 mm., female 23 mm. ; hind 

 /femora, male 16 mm., female 15 mm. 



Seventy males, 106 females. British Columbia, Crotch (Museum Com- 

 parative Zoology; S. H. Scudder); La Chappies, YakimaEiver, Wash- 

 ington, July 16, S. Henshaw (Museum Comparative Zoology); Little 

 Spokane, Washington, July 24, S. Henshaw (same); Camp Umatilhi, 

 Washington, June 27, Henshaw (same); Ellensburg, Kittitas County. 

 Washington, July 14-15, Henshaw (same) ; Wallula, Wallawalla County, 

 Washington, Packard (U.S.N.M. Eiley collection; S. H. Scudder); 

 Umatilla, Oregon, June 24, Henshaw (Museum Comparative Zoology; 

 L. Bruner); Siskiyou County, California (U.S.N.M. Eiley collection); 

 Boise City, Ada County, Idaho (same) ; Salmon City, Lemhi County, 

 Idaho (same); Henry Lake, Idaho, August (L. Bruner); Soda Springs, 

 Bannock County, Idaho (same); Montana (U.S.N.M. Eiley collec- 

 tion); Yellowstone, Montana (same); Fort Benton, Choteau County, 

 Montana, July (same); Glendive, Dawson County, Montana, Bruner 

 (same); Fort McKinney, Johnson County, Wyoming, July (same); 

 Crawford County, Iowa, July 13-24, J. A. Allen; Deuison, Crawford 

 County, Iowa, July 20, Allen; Dallas County, Iowa, August, Allen; 

 Jefferson, Greene County, Iowa, July 20-24, in coitu, Allen ; Nebraska, 

 Dodge (S. Henshaw; S. H. Scudder); Pine Eidge, Nebraska, July (L. 

 Bruuer)- Valentine, Cherry County, Nebraska, Bruuer (U.S.N.M. 



