188 INSEJCUTOR INSCITI^ MENSTRUUS 



one-half longer than the front, not strongly pubescent; palpi 

 with five or six strong bristles; cheeks each with two large 

 bristles, the series extending from these toward the antenna 

 weak. Mesonotum distinctly shining ; scutellum with two 

 bristles. Propleurse with several strong bristles next to the 

 fore coxa and a couple of weaker ones below the spiracle; 

 mesopleura above with a patch of small bristles of approxi- 

 mately equal size. Abdomen rather conspicuously bristly on 

 the apical portion ofi each segment, the bristles on the basal 

 segments very small, but becoming larger on the last three 

 segments, especially the sixth which bears on the side eight or 

 ten long slender bristles as well as a number below. Hypo- 

 pygium small with a nearly vertical series of line closely-set 

 bristles on the side and a tuft of fine hairs below at tip ; anal 

 process covered with long fine hairs as long as the apical pair, 

 which is smaller than usual. Legs slender, except the anterior 

 tarsi which are strongly flattened, especially the metatarsus, 

 which is fully as wide as the broadest part of the anterior 

 tibia. Posterior femora slender, simple, not fringed beneath, 

 their tibire without distinctly dfiferentiated setulae. Costal vein 

 reaching to the middle of the wing, with very long, moderately 

 strong bristles, each about as long as the last section of the 

 third vein ; first section of costa distinctly, but not much longer 

 than the second and third combined ; third section two-thirds 

 the length of the first ; fourth vein weakly curved at base, 

 nearly straight beyond, not recurved at tip ; fifth, sixth and 

 seventh nearly straight, the seventh long and strongly de- 

 veloped. 



Type from Moscow Mountain, Idaho, September 9, 1908 

 (Melander). 



This would run in Wood's table (Ent. Month. Mag., vol. 20. 

 p. 114 (1909) ) to horiensis Wood, except that the halteres 

 are not black. It differs from that species by the bristly apex 

 of the abdomen and the neuration. Otherwise the two are 

 very similar and undoubtedly closely related. 



