﻿158 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



(Fig. 65 C) somewhat enlarged. Wings (Fig. 65 E) narrow, moderately 

 long, reaching to seventh abdominal segment, somewhat broadened at base; 

 posterior longitudinal vein extending from near base to near tip, with seven 

 short spines, the first one about opposite the sixth spine on anterior vein ; 

 anterior vein with either eight or nine short spines, six on basal half and 

 either two or three on distal half, the number varying on the same insect some- 

 times ; when there are three the first one occurs near the center of the vein, 

 the third one near the tip, and the second about midway between ; when only 

 two are present the one near the center is wanting, and the two are arranged 



Figure 65. Thrtps abdominalis 



as the distal two wljen three are present; anterior margin with a row of twenty 

 short spines, and a row of short cilia, on distal three-fifths of margin ; 

 posterior margin with a row of long cilia ; color of fore-wings light brown, with 

 a small more or less clear area near base between third and fourth spines on 

 anterior vein ; posterior wings almost clear, with a light brown stripe in center, 

 extending through basal half of wing. 



Abdomen usually slender, sometimes comparatively stout ; with a row of 

 distinct sharp serrations on posterior margin of segments one to seven in- 

 clusive ; eighth with longer and sharper teeth ; almost no spines on abdomen 



