IOWA ACADEMY OF SCIENCES. 225 



pedicel of 3 is short; joints 6 and 7 together form an elongate oval; the 

 latter is acuminate at apex two-fifths the length of the former and 

 terminates in two or three long slender hairs; surface of all the joints set 

 with minute appressed hairs and furnished with a few bristles which are 

 arranged in a preapical ring on joints 2-5, and on remaining segments are 

 replaced by slender hairs; sensorial spines on joints 3, -4 and 6, distinct. 



The prothorax is subquadrate, a little longer and wider than preceding 

 segment; posterior angles nearly rectangular; posterior border margined; 

 surface nearly smooth and, with the exception of two discal areas, covered 

 with coarse, stiff hairs which are largest near lateral and posterior borders; 

 two short bristles at each anterior angle and four longer ones near front 

 border; two large, strong, subequal bristles at each posterior angle, two 

 of moderate length on hind border, and a similar one on disc near each 

 posterior angle. 



The surface of the mesoscutum is apparently smooth, its posterior 

 discal portion only moderately elevated, provided with two small bristles; 

 two similar bristles occur on the posterior border, and one at each lateral 

 angle. The metanotum is very short. The scutellum is obtusely carinated, 

 its surface longitudinally striate, provided with two approximate submar 

 ginal bristles on anterior portion of disc, and two, more widely separated, 

 on basal margin. 



Abdomen is quite uniform in width, convex above, striate at base and at 

 sides; base slender; apex short, conical; segments constricted, bearing a 

 few stiff hairs on dorsal and ventral surfaces and a few bristles at sides; 

 both hairs and bristles become stronger on anal segments, where the latter 

 are arranged in two rings. 



Legs, especially posterior pair, slender; anterior femora but slightly 

 expanded; hind tibiaj spiny on inner margin, terminating in three strong 

 spines, joints of their tarsi also furnished with apical spines; entire surface 

 bristly, especially at apex of intermediate and anterior tibice. 



Wings varying in size from rudimentary to fully developed; the ante- 

 rior pair slightly dusky, posterior pair hyaline; in fully developed wing the 

 cilia on costal border of each pair is short and sparse, on posterior border 

 longer but not very heavy; venation of anterior wings rather weak; ante- 

 rior and posterior basal cross veins present, but not distinct; costal vein 

 furnished with 18-21 spines; cubitus, 10; radius, 10-11; anal, 5; anal cell, 

 1; spines on cubitus are arranged in a basal group of seven, followed by three 

 more widely separated on distal end of vein; longitudinal vein of posterior 

 wings incrassate at base, not quite attaining tip of wing. 



Color usually pale yellow, deeper on thorax and legs, the latter frequently 

 dusky; head and proximal joints of antennte white, intermediate joints 

 brownish-black at base, the rest of the antennas deep black; occiput often 

 tinged with yellow, sometimes dusky; eyes dark red-drown; ocelli yellow, 

 inner margins brick-red; prothorax at margins, disc of mesonotum, pleura3, 

 except upper portion of mesopleuras in front, narrow medium stripe on 

 scutellum, pale; two spots or patches on prothorax, sometimes diffuse 

 and coalescing sometimes nearly or quite obsolete, two broad, approximate 

 stripes on scutellum, diverging slightly and extending outward and back- 

 ward in a broken and interrupted line to lateral margin, upper portion of 

 mesopleurse in front, brown; abdomen somewhat dusky, more or less pale 



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