IOWA ACADEMY OF 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: Length, 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; genas 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 

 antenna3, longitudinally elevated along median line. 



Antennae subapproximate; the two basal joints stout, subequal; the 

 second barrel- shape!, more than one-half as long as succeeding; joints 3-6 

 subequal in lengch and less elongate than in T. triti:i; 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 antennte 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 iiner toward the distal end of tLe antennae; sensorial 

 spines as in T. tritici. 



The prothorax 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. 



