90 inse;cutor insciti^ menstruus 



apex. Pleura gray, pruinose; mesopleura yellow and halteres, 

 which have a dark tip. Abdomen, bases of one to five smoky 

 gray, shading to blackish: apically with a thin gray edging. 

 All with scattered coarse black stubby hairs. Ventral segments 

 yellow brown. Legs, hind femora and tibiae almost as long 

 as the whole mid leg. Coxae, trochanters and femoral bases 

 yellow, shading to brown, until the tarsi are dark. Hind tibia 

 with spurs. Wing, with a more or less definite subcosta to 

 above the origin of Rs: Rs to the origin of i?2 slightly over 

 twice as long as from R., to the rise of /?4+5 ; R2 from Rs to R, 

 about two and a half times as long as Rs, in most specimens 

 the tip oi Ro turns abruptly into R with the result that there 

 is a stub at the corner continuing along the line of the even 

 direction (in one wing of a female it actually reaches R). 

 A similar condition exists near the origin of Rs but the stub 

 is rarely present. R^ joins R beyond a third of R and almost 

 above the base of M„ ; R seems straighter than in comstocki, 

 and the tip of the wing more extended, making the margin of 

 cell R^ longer, and broader ; M^-\-^ lies midway between Mj+o 

 and Cu-^ ; M Cu cross-vein joins the deflexion of Cu slightly 

 farther up Cu; Cu very much broader than the margin of cell 

 -^4+5 'y Cu^ shortly after leaving Cu^ curves abruptly down to 

 the margin. 



The female differs from the male in the mouth parts, which 

 are relatively longer. Segment 3 of the palpi is longer than seg- 

 ment 2, 4 is slightly over half the length of 5. Antennal seg- 

 ments 1 and 2 are about equal, spherical, and much broader than 

 the base of 3. The female has a slightly longer R^, the stub 

 referred to above is more pronounced, actually reaching R in 

 one wing. One specimen is yellow brown all over, thus probably 

 a teneral, though free-flying. 



Described from fifteen free-flying specimens, eight male, 

 seven female; Wilson Creek, Michel, B. C, 5,000 feet (C. Gar- 

 rett). Eleven taken on August 26, 1921 ; two on 27th, the rest 

 on 7th and 18th of September. Types in the author's col- 

 lection ; paratypes in the Canadian National and U. S. National 

 collections. 



