June, 191S.] Hood and Williams: New Thysanoptera. 137 



all capitate, posterior marginals and posterior angulars longest and subequal, 

 the rest slightly shorter and subequal. Pterothorax slightly narrower than 

 prothorax, sides slightly converging posteriorly. Wings long, about 12 times 

 as long as broad, uniform pale brown; hind margin of fore wing with 13—15 

 accessory hairs. Legs slender; fore femur longer than basal width of head; 

 fore tarsi with a stout tooth ; femora dark brown, much lighter at tips ; all 

 tibiae and tarsi, except for a dark spot on the latter, pale yellow. 



Abdomen normal, a little narrower than the pterothorax. Tube 0.76 as 

 long as head and slightly more than twice as broad at base as at apex ; abdom- 

 inal bristles pale in color, long, pointed (except for two capitate bristles on 

 each side of the eighth segment), those on segment 9 longer than the tube; 

 terminal bristles as long as the tube, dark in color. 



Measurements of holotype : Length 2.06 mm.; head, length 0.343 mm., 

 width behind eyes 0.247 mm.; prothorax, length 0.16S mm., width (inclusive 

 of coxae) 0.444 mm.; pterothorax, width 0.432 mm.; abdomen width 0.372 

 mm.; tube, length 0.261 mm., width at base o.ioi mm., at apex 0.048 mm. 



Antennae : 

 Length (yit) 

 Width (^) 



Total length, 0.534 mm. 



Described from one male collected from a low privet hedge in 

 New Orleans, Lotiisiana, on December i, 1914, by C. B. Williams. 



This species may immediately be distingtiished from the two 

 known species of its genus' by the yellow tibi?e, the light color of the 

 first two antenna! segments, and by the relatively stouter and shorter 

 antennae. 



EXPLANATION OF PLATES. 



(J. D. H. del., camera lucida.) 



Plate 7. 



Fig. I. Merothrips fiisciceps n. sp. Segments 7-10 of abdomen, female, 

 holotype. 



Fig. 2. Merothrips fusciceps. Left fore wing, female, holotype. 



Fig. 3. Merothrips fusciceps. Right antenna, female, holotype. 



Fig. 4. Merothrips fusciceps. Head and prothorax, female, holotype. 



Fig. 5. Bregmatothrips gracilis n. sp. Head and prothorax, female, 

 holotype. 



Fig. 6. Bregmatothrips gracilis. Left antenna, female, holotype. 



