214 ♦Seta's Descriptions of ' 



cylindric, naked ; sixth sliglitly longest, nearly equal to 



the 3d and 5th, a little dilated towards the tip ; scutel 

 large. 



OBSERVATIONS. 



This is distinguished from the genera into which 

 Leach has divided Cimbex, Fabr. by the number and 

 construction of the joints of the antennae, combined with 

 the wing cellules. It corresponds with Clavell\ria 

 in its one-jointed club, but has one joint more in its 

 antennas, and only one radial cellule. It agrees with 

 ZxRMX In the number of the joints of the antennae, but 

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

 number of radial cellules. With Perga it is related by 

 the comparative magnitude of the scutel, and the number 

 of joints of the antennae, but differs remarkably in the 

 proportions of the latter, as well as in the number of 

 cubital cellules. Pachylosticta of Klug has a one- 

 jointed club, but one joint less than the present genus, 

 and two radial cellules; and Syzygonia of the same 

 author, with a one-jointed club, has appendiculated 

 radial cellules. 



SPECIES. 



T. nigra. Body black: nasus and labrum green: 



spot before the wings, wing-scale and feet yellowish- 

 green. 



Mexico 



inch. 



Length to the tip of the wings three twentieths of an 



clavate antenna? 



fam 



^ 



