68 Hood — New Genera and Species of N. A. Thysanoptera. 



apex sharply conical; segment 10 with a longitudinal dorsal suture; 

 spines on segments 9 and 10 long, strong, dark in color, and prominent. 

 Segment 1 of abdomen pale yellow, concolorous with pterothorax; re- 

 mainder of abdomen dark blackisb brown, concolorous with or slightly 

 darker than head and prothorax. 



Measurements. — Length, 1.02 nun.; head: length, .135 mm.; width, 



.140 mm.; prothorax: length, 

 .158 mm.; width, .ISO mm.; 

 pterothorax: width, .200 mm.; 

 abdomen: width, .203 mm. An- 

 tenna! segments: 1, 24m; 2, 33m; 

 3, 39m; 4, 33m; 5, 31m; 6, 51m; 

 7, 11m; <S, 1om; total, .237 mm.; 

 width, .018 mm. 



Female: forma macrnptera.— 

 Similar to forma brachyplera, 

 differing as follows: Length 

 about 1.1 mm. Color nearly 

 uniform dark blackish brown, 

 with pterothorax very slightly 

 paler and with legs and interme- 

 diate antennal segments brown- 

 ish yellow, the former shaded 

 with brown or black. 



Ocelli always present, sub- 

 equal in size, equidistant. 



Mesothorax distinctly broader 

 than prothorax and metathorax. 

 Wings long, nearly attaining 

 tip of abdomen, very pale in 

 color, shaded with a light wash 

 of brownish; fore wings with 

 two longitudinal veins reaching 

 nearly to tip; anterior vein 

 usually joined by two cross veins 

 to the costa and with about nine 

 pale bristles, of which two are 

 usually near apex and six or seven near base; the posterior vein can 

 usually be seen arising from the anterior at basal three-sevenths; it is set 

 with eight or nine long spines of which the apical two are slightly more 

 separated at base; hind wings slightly paler than fore wings. 

 First abdominal segment blackish brown. 



Measurements. — Length, 1.14 mm.; head: length, .128 nun.; width, 

 .141mm.; prothorax: length, .1(14 mm. ; width, .186 mm.; mesothorax: 

 width, .233 mm.; metathorax, width, .203 mm.; abdomen: width, .270 

 mm. Antennal segments : 1, 2:1m; 2, 32m; 3, 30m; 4, 33m; 5, 32m; 6,54m; 

 7, 10m; 8, 14m; total, .234 mm.; width, .018 mm. 

 Described from several females of both forms, as follows: Matamoras, 



Fig. 'l. — Bregmatothrips venustus gen. e\ sp. 

 now Female; a, head and prothorax. 

 forma macroptera, xl06; b. left antenna, 

 forma brachyptera, x334. 



