IOWA ACADEMY OP SCIENCES. 
223 
On smartweed, June 16, 1893, and on cucumber, July 28, 1893, 
Ames, Iowa. 
By the shape of the head and by the antennal characters this 
species is allied to T. tritici, but it may readily be distinguished 
from it by the smaller and more approximate ocelli, the 
absence of large conspicuous bristles on the thorax, the differ- 
ence in the number of spines on the wing, and the more slender 
legs. 
Thrips {Euthrips) striata, Osb. 
Can. Ent., Vol. XV, p. 155. 
Thrips inequalis, n. sp. 
Female: Leng-th, 88 mm.; yellow; style and distal portion of antennal 
joints, 3-6, black; joint 6 distinctly annulated toward apex; posterior 
angles of prothorax with a single bristle; lateral bristles on dorsum of 
penultimate segment of abdomen twice as long as intermediate pair. 
Head, broader than long, contracted at posterior border, occiput form- 
ing not more than one-half of its dorsal surface; gense uniformly full; eyes 
of medium size, moderately prominent, distinctly pilose; vertex uniformly 
tumid at anterior margin, becoming transversely convex and descending 
toward posterior margin; ocelli subapproximate; front, above insertion of 
antennae, longitudinally elevated along median line. 
Antennae subapproximate; the two basal joints stout, subequal; the 
second barrel-shaped, more than one-half as long as succeeding; joints 3-6 
subequal in length and less elongate than in T. tritici; joints 3 and 4, 
thick, irregularly turbinate, gibbous below insertion of sensorial spines; 
joint 5, smaller and more regular in shape; the remaining joints form an 
elongate oval; joint 6 has a distinct articulation on distal half, similar to 
the annulation on the sixth antennal joint of T. striata, Osb.; this may be 
an indistinct annulation, in which case the antennse would be properly 
considered nine-jointed, three of the joints forming the style; the ultimate 
joint is nearly cylindrical and longer than the penultimate, which is of the 
same length as that portion of the joint 6 between the annulation and the 
apex; the joints are furnished with a few medium-sized bristles or stiff 
hairs, which become finer toward the distal end of the antennse; sensorial 
spines as in T. tritici. 
The pro thorax is one and one-half times as long as the head, equally as 
broad at anterior border and about one-third broader at posterior border. 
The disc is convex, rather indistinctly striate and sparsely set with stiff, 
blackish hairs or bristles, which are almost entirely wanting on median 
portion, and most numerous near lateral and posterior borders. Posterior 
angles with a single long bristle. 
The disc of the mesoscutum is convex, finely striate, elevated at posterior 
border, provided with a single short bristle near each lateral angle, two 
on disc and two on posterior margin. The scutellum is trapezoidal, gently 
sloping from the very small elevated area near base toward posterior and 
lateral margins; on the basal margin are two widely separated and two 
short approximate bristles. 
