72 Hood — New Genera and Species of N. A. Thj/sanoptera. 



as far separated as those of mesonotum ) and with very close longitudinal 

 striae. Legs stout; fore tarsi armed with a moderately long, acute tooth. 

 Wings attaining first abdominal segment, the three subbasal spines in- 

 fundibuliform. 



Abdomen broadest at segment 2, thence tapering almost straight to 

 tube. Tube between .6 and .7 as long as head, less than twice as wide at 

 base as at apex; sides straight. Marginal and internal abdominal bristles 

 very short, enormously dilated, the former curving posteriorly; bristles 

 at apex of tube short, pointed. 



Measurements. — Length, .92mm.; head: length, .14 mm.; width, .15 

 mm.; prothorax: length, .10 mm. ; width (inclusive of coxa;), .25 mm. ; 

 pterothorax, width, .27 mm.; abdomen: width, .30mm.; tube: length, 

 .09mm.; width at base, .053 mm.; at apex, .021) mm. Antennal seg- 

 ments: l, 21m; 2, 36m; •"-, ■'>»; 4, 42m; 5, 42m; <;, 39m; 7, 36m; 8, 29m; total, 

 .285 mm. ; width at segment 4, .025 mm. 



Male: forma Lrachyptera. — Slightly shorter than female; fore legs 

 usually greatly enlarged, the femora serrate on inner margin and with a 

 strong basal tooth; fore tibia with stout, blunt tooth on inner margin of 

 apex; tarsal tooth very strong. 



Paratype : Xo. 14, (593, U. S. National Museum. 



Described from an excellent series of both sexes, taken during June and 

 July on Opuntia, at Brownsville, Texas, by Mr. Charles A. Hart. 



This interesting species is the smallest known Tubultiferon. In living 

 specimens the enormously dilated bristles appear as minute white dots. 



Rhopalothrips gen. nov. 

 (p6-n-a\ov, club; 6p^, a wood worm. ) 



l>ody very short, broad, compact. Head as broad as long, widest in 

 basal third, narrowed anteriorly; eyes scarcely extending onto ventral 

 surface. Mouth cone short, heavy, attaining fore margin of mesothorax. 

 Antennae eight-segmented, the last three segments compactly united; 

 second segment subglobose, conspicuously widened ; third segment short 

 and conspicuously narrower; antenna! spines and sense cones very 

 slender and weak. Legs short, stout. Abdomen moderately large, broad, 

 All prominent body bristles, excepting those at apex of tube, infundibu- 

 liform. 



Type. —Rhopalothrips bicolor sp. nov. 



It is difficult to say just where in our present classification this genus 

 should be placed. The union of the three apical segments of the antennae 

 suggests DermotJirips hawaiiensis Bagnall and Cephalothrlps monilicornis 

 Reuter, and other points of structure would seem to indicate relationship 

 with the genus Haplolhrips. It probably belongs in the Haplolhrips- 

 Zygothrips-Cephalolhrips-Hindsiana series with Scopseothrips gen. nov. 



In the preceding generic description I have abandoned the use of pres- 

 ence or absence of ocelli and wings, because such characters are of no 

 value even as specific ones. In certain Phloeothripid genera, such as 

 Trichothrips Uzel and Allothrips Hood, whose species live under bark or 



