28 SUB-TB1BE ABIIDES. 



separated from Abia through the club being only two- 

 jointed, and a further character was afforded by the 

 white band at the base of the abdomen. I have not 

 adopted Zar&a, because, in the first place, the club in 

 A. nigricornis and in A. fasciata tends to become in- 

 articulate in isolated specimens ; and secondly, in Abia 

 proper the club is apt to become, and in some speci- 

 mens actually is, only biarticulate. 



The Neotropical genera Pachylosticta and Plagiocera 

 are intermediate in some respect between the two 

 European genera, but differ from both in other re- 

 spects. They agree with Amasis in the structure of 

 the antennae, and in the first and second cubital 

 cellules receiving each a recurrent nervure, but they 

 both differ from it in the eyes not converging on the 

 inner side and in the divisions of the body (the sepa- 

 ration of the clypeus from the front, the lobes of the 

 mesonotum, &c.) being clearly indicated. From Abia 

 they differ in the manner in which the recurrent ner- 

 vures are received, in the eyes being situated at the 

 sides of the head, which is not swollen behind them, in 

 the tarsi having the patellae but slightly developed, 

 and the calcaria are acute, not membranous. From 

 both they differ in the basal joint of the antennae 

 being double the length of the second, and in the 

 transverse basal nervure being almost joined to the 

 cubital. The middle lobe of the mesonotum is tri- 

 angular at the apex, not rounded as in Abia. 



Synopsis of Genera. 



1 (2) First cubital cellule receiving both recurrent nervures. Eyes 



diverging on inner side, confluent on top in <^. Antennae 

 6 7 -jointed. Sutures on head and thorax distinct. Abia. 



2 (1) First cubital cellule receiving only one recurrent nervure. Eyes 



converging on inner side, not confluent in $. Antennae 

 5-jointed ; mesonotal sutures obsolete. Amasis. 



