June, I9I5-] HoOD AND WiLLIAMS : NeW ThYSANOPTERA. 135 



median thickening ; outer pair of bristles at posterior angles very long. Fore 

 femora swollen in the male and fore tarsi strongly toothed. Abdomen about 

 as wide as prothorax, all bristles very long and prominent ; tube shorter than 

 the head, very stout, basal width three times the apical and three-fourths the 

 length. 



Type. — Barythrips sculpticauda Hood and Williams. 



This genus suggests Cryptothrips, Diccratothrips, Dichcctothrips, 

 Trybomia, and Eiirynothrips in certain points of structure. The long 

 prothorax distinguishes it at once from all except Eiirynothrips, 

 which differs in having the mouth cone slender with long labial and 

 maxillary palpi, rounded eyes, irregular cheeks, short bristles, and 

 the pronotum more than twice as long as the head. Trybomia, a 

 South American genus with a pair of stout, forwardly-directed ante- 

 ocular bristles and a very short prothorax, is the only one of the 

 above genera with the tube much shorter than the head. 



Barythrips sculpticauda new species. (Plate X., fig. 3.) 



Male (apterous). — Length about 1.8 mm. Color dark brown, almost 

 black, head and thorax distinctly lighter than abdomen ; mid and hind femora 

 yellow, with a black blotch externally near the base ; fore femora dark brown 

 at base, fading to ochraceous at the apex ; fore tibise and all tarsi brownish 

 yellow, middle and hind tibise blackish brown. Antennal segments i and 2 

 nearly white ; 3 and 4 slightly darker, nearly black in basal half ; 5 still darker, 

 shaded with gray, black in basal third ; 6-8 black. 



Head i.i times as long as wide, broad in front, sides parallel, vertex 

 rounded, surface without sculpture ; postocular bristles more 'than one-third 

 the length of the head. Eyes small, directed forward, about one-fifth as long 

 as the head. Ocelli wanting. Antennre 1.9 times the length of the head; 

 segment i broad; segment 2 longer and narrower; 3—6 clavate, pedicellate; 

 8 two-thirds as long as 7, conical; sense cones: 3, o-i ; 4, 1-2; 5, 1-1+^; 6, 

 I— o'^^ ; 7 with one on dorsum near apex. 



Prothorax about 1.25 times as long as head and (inclusive of coxae) about 

 1.7 times as wide as long; all bristles brown, pointed; anterior marginal bris- 

 tles long and slender; anterior laterals short; midlaterals about half as long 

 as posterior marginals, which are about as long as postoculars ; posterior lat- 

 erals very long, twice as long as the posterior marginals. Pterothorax nar- 

 rower than the prothorax, sides parallel. Fore legs large, swollen, with large 

 tarsal tooth. 



Abdomen large and broad, with long black spines on the posterior margins 

 of the tergites. Tube very broad and heavy, about two-thirds as long as head, 

 1.3 times as long as basal width, fully three times as wide at base as at apex, 

 with several deep longitudinal grooves. 



