KNOWLEDGE OF THE NEOTROPICAL THYSANOPTERA. 381 



Head long, cylindrical ; more than two and one-half times as long as broad 

 at basal third, and a little more than twice the length of the prothorax. 

 Cheeks set with a few short stout spines, a lateral spine behind each eye 

 being longer than the others ; head only very slightly broadened towards 

 basal third ; vertex produced into a conical hump in front of eyes, reaching 

 to the insertion of antennae. Eyes moderately large, finely facetted, and 

 distinctly bulging ; post-ocular spines absent ; ante-ocular spines exceptionally 

 long, overreaching the apex of the second antenna! joint. Ocelli large, 

 placed as in /. longice^DS. Antennae narrowly separated at base, about one- 

 half as long ngain as the head ; first joint cylindrical ; second longer than 

 first and slightly constricted at base ; third to fifth claviform, and sixth to 

 eighth fusiform. Third joint nearly three times the length of the second ; 

 fourth three-quarters of third ; fifth five-sixths of fourth ; sixth three-quarters 

 of fifth; and seventh about three-quarters of preceding and half as long again 

 as the apical joint. The three apical joints are covered with numerous short 

 sense-hairs. Sense-cones moderately long, acute, and apparently only one 

 on the sixth joint. Mouth-cone rounded^ scarcely reaching more than one- 

 third way across presternum. 



Prothorax one and three-eighths as broad (excluding fore-coxse) as long, 

 widened gradually from anterior margin to middle, the sides being gently 

 arcuate, and as wide across base as through middle. Spine at each hind- 

 angle and the inner posterior n)arginal pair moderately long and stout ; 

 raid-lateral and anterior marginal spines obsolete, and spine at each fore-angle 

 very short, but stout. Fore-coxa projecting considerably, armed with one 

 long, conspicuous spine, and two or three short ones behind. Fore-femur 

 moderately broad, broadest at basal third, where it is two-fifths as broad as 

 long ; armed with several short spines, five or six longer and stouter 

 ones on the outer margin of basal third, and two or three long ones near 

 middle. Fore-tibia and tarsus together equal the length of femur ; tibia 

 rather broad^ and the tarsus long, and armed with a moderately long and 

 stout tooth near base. Intermediate and posterior legs long ; a few long and 

 strong spines on femora, and short ones at tip of each tibia^ protecting the 

 tarsus. Pterothorax slightly wider than the width across the fore-coxse, 

 almost square ; sides of metathorax gently arcuate, and narrowing to base 

 of abdomen. A pair of rather long bristles at the outer edge of each of 

 the meso-metathoracic stigmata, and a longer one on each lateral margin 

 of the metathorax. Wings reaching to the fifth abdominal segment, and 

 no segments furnished with wing-retaining spines beyond the fifth one ; 

 wings rather lightly fringed, and median vein extending for more than half 

 the length. 



Abdomen long and very slender, gradually narrowing from the base to 

 tube ; slightly more than two-thirds the total length of insect. Tube about 

 three-fifths the length of the preceding segment and two-thirds the length 



