112 FAMIDY v.— TRYXALIN.-E. 



interested should consult his "Revision of the Tryxalinas of 

 North America." It is fully illustrated. 



This sub-family is easily separated from all others with 

 the exception of the CEdipodinee, in which exist genera that 

 form a perfect connecting link. 



The Tryxalinae diifer from the other members of the Acri- 

 didae by Dossessing a conical and elongated vertex, the front 

 strongl}^ receding, flattened antennae, which are inserted be- 

 tween the middle of the eyes, or farther from the mouth 

 than their middle. The eyes are usually longer than that 

 part of the genae below them; the posterior lobe of the pro- 

 notum is usually shorter than the anterior part ; the median 

 carina is not at all crested, and the last spine of the outer row 

 of the posterior tibiae is wanting. The difference between 

 this family and the CEdipodinae is in the joining of the ver- 

 tex and front, as indicated in the table of sub-families given 

 before. 



Most members of this sub-family of orthoptera are 

 grass-loving insects, which delight to rest upon sandy spots 

 surrounded by these plants. They strongly contrast in this 

 respect with the CEdipodinae, which generally prefer barren 

 hillsides, dusty roads and other localities characterized by 

 scanty vegetation. The short wings of the former are never 

 brilliantly colored, nor are their tegmina hirge and showy^ 

 as this would not blend well with their surroundings. Yet 

 the colors, even in the same species, are quite variable, 

 brown or green tints predominating. 



GENERA OF TRYXALIN^ FOUND IN MINNESOTA. 



A. Head equaling, never exceeding, the pronotum in length. 

 Antennae triquetrous or strongly depressed at base; 

 pronotum with the lateral lobes vertical and straight 

 and the lateral carina not at all sinuate; median 

 carina of the pronotum generally cut much behind the 

 middle; the disk plain and unstriped. 



