OF NATURAI, HlSTnUY. 676 



TIU'LHA Say. 



Arttficial Character. — Antenna; six-jointfd ; last joint davate. 

 Radial ci'llule one. Cubital cellules three. 



Katuial Charactir — The antennae are ratht-r sliort, decidedly 

 elavate ; first joint very short, not lonjrer than broad; second 

 joint at least a.s \ou>^ ivj^n'iu as the first and somewhat more ro- 

 bust, cylindrical ; third rather lon<,'er than the 1st and lid to- 

 gether, much more slender, cylindric, hairy; fourth minute, 

 shortest; fifth about the length <if the third, subcylindrie, [214] 

 naked ; sixth slightly longest, nearly eijual tt» tlie od and 'nh, a 

 little dilated towards the tip ; scutcl large. 



Obsmatioiis. — This is distinguished fri»m the genera into 

 which Leach has divided Cimhr.v l'a})r. by the number and con- 

 struction of the joints of the antennae, combined with the wing 

 cellules. It corresponds with Churlluriii in its one-jointed club, 

 but has one joint more in its antennae, and only one radial cellule. 

 It agrees with Zarica in the number of the joints of the antenna;, 

 but not in the number which constitute the club, nor in the 

 number of radial cellules. With Perga it is related by the com- 

 parative magnitude of the scutcd, and the number of joints of 

 the antennae, but diflers remarkably in the proportions of the 

 latter, as well as in the number of cubital cellules. Fachylosticta 

 of Klughas a one-jointed club, but one joint less than the pre- 

 sent genu.s, and two radial cellules; and ,Sj/~//</onin of the same 

 author, with a one-jtnntfd club, has appendiculated radial cel- 

 lules. 



T. NI(;ra. — Body black: nasus and labrum green : spot before 

 the wings, wing-scale and feet yellowish-green. 



Inhabits Mexico. 



Length to the tip of the wings three-twentieths of an inch. 



The smallest species I have seen of this family with davate 

 antennae. [215] 



1835.] 



