IOWA ACADEMY OF SCIENCES. 
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across whole anterior border; ocellar area small, elevated; ocelli approxi- 
mate, inner margins heavy, conspicuous: ocellar bristles not more than 
one-half the length of the head; eyes large, prominent, feebly pilose. 
Antennae eight-jointed, distant, moderately bristly; basal joint short, 
thick, hidden from dorsal view by vertex; the following joint longer, more 
robust, globose; joints 3-6 elongate; joint 3 the longest, subfusiform; joint 
4 a little shorter than joint 3, elongate-modioliform; joint 5 obovate, inter- 
mediate in length between 2 and 4; the remaining joints sessile, together 
elongate-conical; joint 6 equal to joint 4 but a little stouter; joints 7 and 8 
minute, together one-half as long as preceding, line of separation between 
them oblique; sensorial spines on joint 6 originate beyond middle; four 
short bristles in transverse row on front above antennse, and one behind 
each eye; mouth parts nearly symmetrical. 
Prothorax broader than long; anterior angles prominent, rectangular; 
posterior angles broadly rounded and furnished with a single bristle; sur- 
face plainly and uniformly marked with transverse striae, with a few short 
slender bristles on front margin and more on disc. Mesoscutum is quite con- 
vex from base to apex, marked with fine transverse striae, and provided 
with four short bristles on disc. Scutellum with triangular area at base 
striate as in mesoscutum, furnished wdth four basal bristles. 
Abdomen broad, ovate; sides, under high power, appear thickly set 
with minute appressed hairs; a pair of bristles occurs on disc of each seg- 
ment from the second to the seventh; they are approximate on the second 
and gradually become more widely separated on the succeeding segments; 
lateral bristles few and short; apical border at sides and on ventral surface of 
segments bordered with minute cilise interspersed with coarse hairs or 
bristles; caudal spines rather light; those on penultimate segment directed 
backward and extending only to base of following segment; terminal spines 
a little longer than the preceding, radiating at sides. 
Legs very slender, somewhat bristly; tarsi elongate; anterior femora 
not dilated; apex of intermediate and posterior tibiae and of posterior tarsal 
joints terminating in short spines; inner margin of posterior tibiae feebly 
spinose. 
Wings; veins heavy; in anterior pair radius and cross veins obsolete; 
costal spines number 22-30; cubital, 20-26, arranged in two series; radial, 2; 
anal, 4; one near base of anal ceil; longitudinal vein of posterior wing very 
heavy for two-thirds of the length. 
Male. Length, 78-86 mm. Resembles the female very closely. 
Differs in being of smaller size, in having from 23-25 costal spines, 20-21 
cubital: the remaining spines on the wing as in female. The apex of the 
abdomen is more blunt; the anal segment is cleft on either side, the lateral 
lobes terminate in two spines; the middle lobe is prolonged consider- 
ably beyond the lateral lobes, making apex more pointed than apex of 
male of T. tritici. The spines on preanal segment are similar to those 
in female. 
This species presents considerable variation in color. The extreme 
forms are quite distinct and might almost be considered separate species 
were it not that in addition to the similarity in structure there is the occur- 
rence of a series of intergradient forms. 
