NO. DUO. NORTH AMERICAN THYSANOPTERA— HINDS. - 137 



Abdomen elongfate-ovate in outline, bluntly pointed at tip. one and 

 four-tifths times as lono- as l)road; spines upon last two segments short, 

 weak, and inconspicuous; ovipositor short and weak. Color rusty- 

 gray i)rownish upon sides, and pale yellowish upon last two segments. 



Described from two females. 



(htype.—Q2it. No. 6324, U.S.N.M. 



jr((l(\ — Length 0.66 mm. (0.58 to 0.78 mm.); width of mesothorax 

 0.28 mm. (0.19 to 0.25 mm.). General color of head and prothorax 

 grayish or yellowish brown; pterothorax abruptly pale 3'ellowish, 

 shading through gra}^ to chestnut l)ro'svn upon last two al)dominal 

 segnuMits. 



Head as wide as long, without ocelli; relative lengths of antennal 

 segments as follows: 



Prothorax one and one-third times as long as head, and one and one- 

 half times as wide as long; mesothorax one and one-sixth times as 

 wide as prothorax; wings wanting; terminal two segments conoid; 

 spines thereupon slightly more prominent than in female. 

 Described from seven males. 

 Cofype.-C^it. No. 6324, U.S.N.M. 

 ^ Food jyl'n^t' — Panicuni ca^nlai'e. 

 \ Habitat. — Amherst, Massachusetts. 

 Life history unknown. 



CHIROTHRIPS OBESUS, new species. 



Plate II, figs. 21, 22. 



Female. — Length 0.78 mm. ; width of mesothorax 0.29 mm.; width 

 of abdomen 0.275 mm. General color of head and thorax 3'ellowish 

 brown; abdomen pale 3'ellow. 



Head very small, as wide as long, narrowed anteriorly, much elon- 

 gated between the eyes, acuminate between ])asal segments of antenna?. 

 Eyes dark, relatively large, occupying sides of head from close to base 

 of antenna? almost to posterior edge of head; distance between ej^es 

 one-half the width of head; ocelli rather small and placed very far 

 l)ack between hind edge of eyes; anterior angle of triangle formed hy 

 oc(dli is very obtuse; color pale vellow, margined inwardly, or entirely 

 surrounded Ijy red patches. Mouth cone very short and blunt; max- 

 illary palpi short, three segmented. Antenna? one and three-fourths 

 times as long as head, situated upon the elongated portion thereof; 

 relative lengths of segments as folloAVs: 



