IOWA ACADEMY OP SCIENCES. 217 



except apex, varj'ing from pale to deep fuscous; anterior wings subfuligi- 

 nous, clearer at base. Form slender; bristles and spines short, inconspicu- 

 ous; head, from dorsal view, subpentagonal ; antenna? seven-jointed, 

 approxioaate; ocelli placed very far forward toward front border of head; 

 posterior angles of prothorax bisetose; spines on cubitus 15-16, arranged in 

 a basal series of three or four followed by an intermediate group of nine, 

 and this by two, more widely separated, at distal end of vein. 



Head, seen from above, subpentagonal, its greatest leng'th equal to its 

 greatest width; sides constricted behind eyes; front margin produced, and 

 subangulated in middle, its width almost completely occupied by the 

 antenna?; eyes dark red-brown, of medium size, moderately granulated, 

 pile scattered, long; posterior orbits depressed, with a row of short sparse 

 hairs parallel to them; vertex scarcely elevated, gradually descending 

 toward apex where it merges into the front; ocelli yellow, inner margins 

 red; anterior ocellas on upper margin of front; lateral ocelli contiguous to 

 upper orbits; ocellar bristles moderately long; small bristles between ante- 

 rior ocellus and the eyes; occiput striate, provided with two weak bristles; 

 front produced to base of antenna? thence receding toward clypeus, fur- 

 nished with a row of four weak bristles just beneath antenna? and two 

 similar bristles near clypeal margin. Antenna? seven-jointed, approximate, 

 base plainly visible from above; joint 1 shortest and thickest, one-half the 

 length of the second; joints 2-4 increase in length in the order named; joint 

 4 is nearly as long as joint 6, which is larger than any other joint; joint 5 

 is slightly longer than the second and more slender than any of the preced- 

 ing; joints 6 and 7 are closely united and together pyriform in shape; the 

 latter is nearly one-half the length of the former; the first joint is sub- 

 rotund; the second, somewhat barrel-shaped; the third subfusiform; the 

 fourth and the sixth elongate- ovate; the fifth submoniliform; the seventh 

 lanceolate, its base narrower than the apex of the sixth; bristles and sen- 

 sorial spines of joint 4 placed nearer the middle than usual. 



Prothorax subquadrate, scarcely broader than head; sides very slightly 

 constricted at anterior border; posterior angles narrowly truncate, pro- 

 vided with two bristles; shorter bristles or hairs are scattered over a trian- 

 gular area extending backward from the front margin, and a smaller area 

 near the posterior angles; anterior angles provided with equally small, but 

 heavier bristles; surface apparently smooth; mesoscutum broadly convex, 

 nearly smooth, furnished with short inconspicuous bristles each side and 

 two submedian bristles on disc. The scutellum, obtusely ridged, feebly 

 sculptured, provided with two short, heavy, approximate bristles on ridge 

 near basal margin. 



Abdomen slender; apex abruptly conical, resembling that of females of 

 this family; sides distinctly sculptured; segments with a few bristles or 

 coarse hairs laterally and on apical border of their ventral surface; caudal 

 segments with longer and stronger radiating bristles arranged in two 

 rings as in females. 



Legs slender; anterior femora scarcely expanded; posterior tibia? 

 spiny on inner margin and at apex; their tarsal joints with apical spines. 

 Anterior wings lanceolate, humeral angle moderately arched; cubitus 

 extending entire leng-th of wing; radial vein obsolete at base and nearly 

 obsolete at tip; costal spines, 22-24; cubital spines, 15-16, arranged in 



