210 Sai/s Descriptions of 



I 



again as the second : carpus large : tibiae with one pair of 

 spines at tip. 



OBSERVATIONS. 



The family of which this new genus is a member, was 

 divided by Leach into 9 Stirpes, all of which have 9 or 

 more joints in the antennae excepting the 1st, 2d, and 5th. 

 Of these, two genera only, have 6-jointed antennae, viz. 

 Zauea and Perga, Leach ; but both have clavate an- 

 tennae and in many respects are at variance with the 

 characters of the present insect. In a later work, the 

 " Entomologische Monographieen," by Dr. Klug, which 

 that author has done me the favor to send me, are the 

 . two new genera PACH-stLosTicxA and Syzygonia, both 

 of which have clavate antennae, and therefore, like the 

 preceding, cannot possibly include our insect. 



SPECIES. 



A. dorsdUs. Black ; hypostoma, a base of the tergum 

 and feet whitish. 



Inhabits Indiana. 



i 9 Black, with minute whitish hairs : nasus, labrum 

 hnd mouth white: mandibles rufous at tip: thorax with 

 the anterior segment, curving to the base of the wing, 

 white ; line of the insertion of the wings white : whgs a 

 little dusky ; nervures fuscous : tergum pale yellowish on 

 the basal disk, blackish brown at tip : venter more or 





coxae whitish-green. 



feet 



Var. a. Feet and part of the costal rib green ; scute! 

 and posterior portion of the stethidium whitish. 



