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



Prothorax about .7 as long as head and (inclusive of coxae) approxi- 

 mately two and a half times as wide as long; all usual spines present, very 

 short and broadly infundibuliform ;* coxa] spine wine-glass-shaped as seen 

 from above; dorsal surface at each side with a broad, shallow fovea. 

 Pterothorax large, broader than prothorax, subrectangular ; meso- and 

 metanotum each with one pair of large, dilated bristles near posterior 

 margin. Legs stout; lure tarsi armed each with a minute, acute tooth. 

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

 fimdibnliform. 



Abdomen slightly broader than pterothorax, heavy, roundly narrowed 

 to tube. Tube a little more than .(> 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, .93 mm.; head: length, .126mm.; width, 

 .144 mm.; prothorax: length, .090 mm.; width (including coxa?), .224 

 mm.; pterothorax: width, .240 mm. ; abdomen: width, .270 mm.; tube: 

 length, .079 mm. ; width at base, .044 mm. ; at apex, .026 mm. Antenna! 

 segments: 1, 21m; 2, 35/* x 32/*; •'>, 27m x lSit; 4, 2>:!/* x 25/*; 5, 36/*; <>, 

 :>5/*; 7, 24/*; 8, 18/*; total length of antenna, .23 mm. 



Paratype : No. 14,694, U. S. National Museum. 



Described from forty-nine females taken July 4, L908, on Opuntia at 

 Topo Chico (near Monterey), Mexico, by Mr. Charles A. Hart. 



With the exception of Cryptothrips dentipes Renter, which has a pale 

 prothorax, this is the only bicolored species of the suborder. 



Genus Liotjirifs Uzel, 1895. 



Liothrips varicornis sp. nov. 



Fig. (i, a and b. 



Female. — Length about 2.1 mm. Color dark blackish brown or black; 

 tarsi, articulations of legs, apices of antennal segments, and tip of tube 

 paler; third antennal segment abruptly pale yellow. 



Head about one and one-fifth as long as wide, broadest across cheeks; 

 the latter gently arcuate, slightly converging posteriorly ; vertex elevated, 

 produced, anterior ocellus distinctly overhanging; dorsal and lateral 

 surfaces finely transversely striate, set with several short, inconspicuous 

 spines; postocular bristles pointed, about as long as eyes. Eyes large, 

 finely faceted, not at all protruding, one-third as long as head. Ocelli 

 anterior; posterior ocelli opposite anterior third of eyes. Antennae twice 

 as long as head, moderately slender ; segments 1 and 2 nearly concolorous 

 with body, 2 slightly paler toward apex and at middle; 3 pale yellow, 

 slightly clouded apically ; 4-8 nearly concolorous with body, slightly paler 

 at apex ; segments 3-6 clavate, pedicellate; 7 oblong, pedicellate; S sub- 

 conical ; sense cones slender, colorless; formula: 3, 0-1 ; 4, 1-1 + 1 ; 5, 

 1-1 + 1 ; 0, 1-1 + 1 ; 7 with one on dorsum near apex. Mouth cone acute, 

 slightly surpassing base of presternum. 



* See note under Scopseothrips unieolor, p. 71. 



