224 IOWA ACADEMY OF SCIENCES. 



The abdomen is ovate, resembling that of T. tritici, Fitch, in an arrange- 

 ment of bristles, except that the median pair on penultimate segment is 

 but one-half as long as those on either side. 



Legs, especially femora and. tibiae, thinly covered with short, coarse 

 hairs which are replaced by bristles at apex of anterior and intermediate 

 tarsal joints; inner margin of posterior tibite feebly spinose; its apex and 

 apex of its tarsal joints terminating in spines; anterior femora moderately 

 dilated. 



Anterior wings nearly attain tip of abdomen: veins heavy: inner mar- 

 ginal vein very distinct; costal fringe rather heavy; costal vein bears from 

 24-28 spines; radius, 18-19, those on basal half of vein separated into two 

 groups of four each, the intervals between the rest growing wider toward 

 the distal end of the vein; cubitus, 10-Jl; anal, 5; anal cell, 1. 



Color yellow, deeply tinged with orange on thorax and abdomen, 

 faintly dusky along median line of thorax and abdomen; head and two 

 basal joints of antenna?, whitish; proximal portion of joints 3-6, dusky; 

 remainder of antencie and spot near apex of tarsi, black; ej^es, red-brown; 

 ocelli, pale yellow; inner margins, orange red; spines and bristles black- 

 ish; anterior wings and fringes tinged with dusky yellow. 



Described from a single specimen taken with T. tritici on 

 aster at Ames, Iowa, September 16, 1893. 



Thrips tabaci, Lind. 



Schadlichsteu Insekten des Tabak in Bessar. Abien., pp. 

 62-63. (1888.) 

 Thrips lactucoe, n. sp. 



Female: Length, 1.40 mm. General color pale yellow^, with two broad 

 diverging stripes on middle of thorax, a narrow band at base and one or 

 more spots at sides of abdominal segments brown. Form elongate; anterior 

 border of head convex. Antennse seven-jointed, proximal joints pale, 

 remaining joints black. Wings variable in size. Ocelli conspicuous, 

 placed close together near posterior margin of vertex. Spines and bristles 

 stout, on thorax, arranged much as in T. tritici; the cubital spines are 

 grouped into two series, a basal group of seven, followed by three, more 

 widely separated, on distal portion of vein. 



Head scarcely broader than long; outline seen from above semiovate;. 

 occiput, feebly striate, one-half the length of the head, with shallow, 

 longitudinal furrow each side behind the eye; gente, broad, full, prolonged 

 posteriori} ; vertex elevated, convex between the eyes, ascending and 

 expanding towards apex, front margin arcuate; ocelli conspicuous, remote 

 from anterior border of vertex, inner margins heavy, contiguous in front; 

 ocellar area elevated; ocellar bristles of medium size; eyes, moderate, 

 pilose; a row of bristles on front, beneath insertion of antennae, is partially 

 visible from above; a few microscopic bristles around orbits; antennal 

 sockets prominent, easily seen from above; antennas approximate, seven- 

 jointed: the intermediate joints elongate: joint 1 is one-half the lengih of 

 joint 2, equal to or longer than joint 7, semiglobose: joints 2-5 are sub- 

 equal in length; joint 2 is cupshaped, a little shorter but much stouter 

 than any of the three immediately following; joints 3-5 are moniliform; 



