8 INSECUTOR INSCITI^ MENSTRUUS 



more or less barrel-shaped, with sense cones; 9 about 2.5 

 times as long as wide, narrowed to apex; segment 1 slightly 

 paler than head, 2 concolorous with head; 3 grayish yellow, 

 distinctly clouded apically ; 4 not abruptly darker than 3, more 

 deeply infuscate in apical half and narrowly so at extreme 

 base ; 5 slightly lighter than 6-9, which are blackish brown. 



Prothorax about 1.1 times as long as head and a little less 

 than twice as wide as long, sides and posterior margin rounded, 

 anterior margin straight; notum with a few inconspicuous 

 spines, its surface free from sculpture. Wings of fore pair 

 nearly twice as wide near base as at middle, the greatest sub- 

 basal width (exclusive of scale) about one-ninth the length 

 of wing; costal margin, anterior vein, and posterior vein with 

 about 25, 22, and 18 short, stout spines, respectively. 



Abdomen stout; pubescence comparatively dense, disposed 

 on close, anastomozing, transverse lines, almost as in H. serica- 

 tus Hood ; posterior margins of abdominal tergites 1-5 fringed 

 at sides with numerous slender spines which are not at all 

 coalesced at base to form plates or scales; tergites 6-8 and 

 sternites 2-6 with their entire posterior margins similarly pro- 

 duced. 



Measurements of holotype : Length 0.840 mm. ; head, length 

 0.096 mm., width 0.132 mm. ; prothorax, length 0,106 mm., 

 width 0.192 mm. ; pterothorax, width 0.228 mm. ; fore wing, 

 length 0.588 mm., width at base 0.066 mm., at middle 0,036 

 mm. ; abdomen, width 0.282 mm. 



Antennal segments 1 2 3 4 5 



Length (ji) 19 32 52 36 27 



Width (fi) 26 23 23 22 18 



Total length of antenna, 0.225 mm. 



Described from one female taken by Mr. James Zetek from 

 the flower of a tree at Sona, Panama, April 22, 1914. The 

 Spanish name of the plant, according to Mr. Zetek, is "Nance," 

 which probably refers to Byrsonima crassifolia H. B. 

 and K. With this unique female were associated numerous 

 individuals of Heterothrips flavicornis, new species. 



This is the only known species of the genus with a densely 

 pubescent abdomen and a smooth pronotum. 



