212 Say^s Descriptions of 



Genus Atomacera, Say. 



GENERIC CHARACTER. 



Body rather short: antennse with but three obvious 

 joints ; in the male ciliated : cellules^ one radial, unap- 

 pendiculated ; three or four cubitals, the dividing nervure 

 of the first and second being obsolete : tibi^ destitute of 

 a spine in their middle. 



OB9ERVATI0XS, 



The name of Cryptus, applied by ' Jurine to one of 

 his genera, had been previously appropriated by Fabri- 

 cius to a genus of ICHJVEUMomjDES, and is altogether 

 synonymous with Htlotoma of Latreille, which is the 

 anterior designation. It includes species of at least three 

 genera, all of which are distinguishd by tri-articulate 



antennae. It may be thus divided, with modified char- 

 acters. 



Htlotoma, Latr. Radial cellule appendiculated : 

 four posterior tibiae with a spine on then- middle. 

 H. roscB, F. 



Atomacera, Nob. Radial cellule simple; tibi® 

 destitute of a spine on their middle. . 



Cryptus, Jurine (by error). Antenna of the male 

 biparted ; tibiae destitute of a spbe on their middle. 



C.furcdta,F. C. Klugii, Leach] he. 



1. A. dehilis. Black; tibia whitish. 



Inhabits Indiana. 



S Body black, polished : antennce, cilia longer than 

 the transverse diameter of the antenna : mouth dull 



piceous : wings fuliginous, a little paler at tip : first and 



