GENERA OF THYSANOPTERA FROM VENEZUELA. 331 



constricted towards base ; third to fifth mildly claviform, and sixth to eighth 

 fusiform. Third joint six times the length of second ; fourth two-thirds of 

 third ; fifth one-half of fourth ; sixth three-quarters of fifth ; seventh two- 

 thirds of sixth ; the apical three-quarters of penultimate, much narrower and 

 apparently having the apical third styliform. Sense-cones short and almost 

 indistinguishable. 



Prothorax strongly transverse, one-half as long medianly as broad ; dorsal 

 surface with a slight depression near each fore-angle and a similar depression 

 (or irregular fovea) just below centre of disc ; anterior margin emarginate 

 and posterior margin arcuate, sides strongly and evenly widened posteriorly 

 to mid-line where the breadth is equal to the breadth of base ; posterior 

 angles rounded. Spines at posterior angles and the posterior-marginal pair 

 long and strong, the inner pair being especially long ; pair at anterior angles 

 very short and stout, and other prothoracic spines obsolete. Fore-coxa with 

 one short and conspicuous spine ; fore-femur not strongly dilated, three and 

 one-half times as long as wide through middle ; outer basal angle somewhat 

 acute, and slight constriction before apex ; encircled before apex with several 

 stout spines, which are shortest within, and two longer spines before middle ; 

 similar arrangement of spines on the posterior and intermediate femora, but 

 each with only a single long spine before middle. Two long bristles on all 

 tibise just below knees, and a similar but weaker bristle before tip on the hind 

 and intermediate pairs. Fore-tarsus armed with what appears to be a slender, 

 acute, and forward! y-directed tooth. Posterior and intermediate legs lono- 

 and slender. Pterothorax slightly broader than long ; mesothorax decidedly 

 wider than the width across fore-coxse, nearly five times as wide as long, and 

 only one-half the length of metathorax ; metathorax strongly rounded laterally, 

 and armed in the mid-line with a moderately long and strong subiateral dorsal 

 spine, and a shorter lateral one near base. Metascutum armed with two verv 

 lono- bristles, each having its base near the anterior ano-les. Winos reachino- 

 to the sixth abdominal segment, strong and broad with the tips broadly 

 rounded; cilia fine, not exceptionally long ; median vein obsolete. 



Abdomen subdepressed, broadening from the base to the third seo-ment 

 where it is decidedly broader than the metathorax, and from thence gradually 

 narrowing to base of tube. Segments one to nine transverse, eighth and 

 ninth apparently cylindrical, the eighth almost quadrate and as long as the 

 preceding, and the ninth one-half the length of the eighth and two-thirds as 

 long as wide. Tube with sides almost parallel, slightly widened near base and 

 gently constricted near apex ; seven times as long as breadth through middle, 

 not quite five times the length of the preceding segment, and equal in length 

 to the dorsal length of head. Terminal bristles short. Bristles on hind 

 margin of ninth segment very long, about the length of tube. Other 

 abdominal bristles more than usually stout, and placed as follows : — a short 



LINN. JOURN. — ZOOLOGY, VOL. XXX. 26 



