Hood — Descriptions of New Thysanoptera. 119 



3 grayish yellow; 4-6 successively darker; 7-9 slightly paler. Maxillary 

 palpi three-segmented. , 



Prothorax 1.1 times as long as head and about one and one-half times 

 as wide as long; pronotum smooth; one prominent dark bristle at poster- 

 ior angle, about 0.8 the length of prothorax, and another pair half as 

 long on posterior margin near median line ; other bristles short and incon- 

 spicuous. Wings of fore pair about twelve times as long as width at 

 middle, nearly uniform brownish gray; costa, principal vein, and poster- 

 ior vein with about 27, 20, and 14 nearly equidistant, long bristles, 

 respectively. 



Abdomen of normal form, with a few very faint lines of sculpture at 

 sides ; tergites 2-6 with a gradually increasing number of slender spines 

 along lateral portion of posterior margins; 7 and 8 with an uninterrupted 

 posterior fringe of similar spines; segments 9 and 10 rather long, acutely 

 conical, with long, prominent, dark bristles; 10 divided above in apical 

 four-fifths. 



Measurements of holotype: Length l.?>6 mm. ; head, length 0.140 mm., 

 width 0.185 mm.; prothorax, length 0.156 mm., width 0.240 mm.; ptero- 

 thorax, width 0.312 mm.; fore wing, length 0.840 mm., width near base 

 0.090 mm., at middle 0.067 mm.; abdomen, width 0.360 mm. 



Antennal segments : 123456789 



Length i/x) 36 50 72 62 49 48 9 11 15 



Width (fi) 35 30 25 21 19 21 14 11 9 



Total length of antenna, 0.352 mm. 



Described from 4 females taken at Panama City, Panama, in 1915, "in 

 blue flower on bush," by James Zetek. 



A very distinct species, easily known by its large size and dark color. 



Chtlothrips gen. nov. 

 (XerXos, a lip; ©p"A, a wood worm.) 



Body almost free from sculpture. Head short and broad, nearly twice 

 as wide as long, broadest near base ; vertex with an acute tubercle below 

 anterior ocellus. Eyes small, shorter than cheeks and only about half as 

 wide as their interval. Antennae eight-segmented, inserted on lower sur- 

 face of head below vertex; segments 3 and 4 with forked sense-cones. 

 Mouth-cone very large and elongate, heavily chitinized, extending far 

 onto mesosternum; maxillary palpi three-segmented, basal segment 

 longest, middle segment shortest. Prothorax long, fully twice the length 

 of head, only slightly widened behind, with sides nearly straight; pos- 

 terior angles with one pair of short bristles. Wings slender, only slightly 

 wider at base, bristles arranged as in Oxythrips. Abdomen of female 

 sharply conical at tip, the tenth segment distinctly longer than ninth. 



Type — Chilothrips pini sp. nov. 



Closely related to Oxythrips, but separable by the enlarged mouth-cone, 

 the short head, and the insertion of the antennae below the vertex. 



