108 THE UNIVERSITY SCIENCE BULLETIN. 



Subfamily JASSIN^ (A. & S.). 

 In this subfamily are included a great variety of forms and 

 more than three times as many species as in the preceding sub- 

 families combined. It is rather hard to give distinct charac- 

 teristics for the group for it contains a very heterogeneous 

 mass of species. The members of one of its tribes frequently 

 lack ocelli, a condition not found in the other subfamilies. In 

 the other tribes the ocelli are on or very near the margin of the 

 vertex and thus these two tribes differ from the members of 

 the other subfamilies where the ocelli are either on the front, 

 below the margin of the vertex, or on the disc of the vertex, 

 above the margin. 



KEY TO THE TRIBES. 



A. Ocelli either just above margin of vertex or distant from the 

 eyes. Acucephalini. 



AA. Ocelli, if present, on margin of vertex and not distant from the eyes. 



B. Nervures of elytra branching on disc. Jasshii. 



BB. Nervures of elytra not branching on disc. Typhlocybini. 



Tribe ACUCEPHALINI (Dohrn). 



The members of this tribe are in the main broad, robust 

 forms in which the ocelli are either situated just above the 

 margin of the vertex, or on the margin, but much further from 

 the eyes than is normally their situation for the members of 

 the tribe Jassini. 



KEY TO GENERA. 



A. Head flattened, vertex long, distinctly angled apically. 



Memnonia. 

 AA. Head conical, vertex shorter, rounded apically. 



B. Head moderately long, pronotum not produced beyond anterior 

 margin of eyes. Xesfocephalns. 



BB. Head short, pronotum produced beyond anterior margin of 

 eyes. Nionia. 



Genus Memnonia Ball. 



The following is the original description of the genus : "Gen- 

 eral form of Acucephalus, vertex convex, sloping, nearly right 

 angled, about half as long as the width across the eyes, the an- 

 terior margin thick, ocelli on the margin above the frontal 

 sutures, distant from the eyes; face convex, forming an acute 

 angle with the vertex, front above broad, narrowing below and 

 abruptly rounding to the parallel margined clypeus; pronotum 

 as long or longer than vertex, strongly, transversely wrinkled, 

 the lateral margins less than half the middle length, anterior 



