249 



1. Pronotmn extending back only on the base of the elytra: 



a. Prosternura armed with a strong spine. Elytra and wings rudimen- 

 tary : 



Gen. 1 — - Podisma. 



h. Prosternum unarmed : 



* Face vertical; pronotum unicarinate : 



Gren. 2 - '. ? . . . (Edipoda. 



** Face deflexed ; pronotum tricarinate : 



Gen. 3 . . - - Gomphocerus. 



2. Pronotum extending to the tip of the abdomen : 



Gen. 4 Tetrix. 



Remark. — I have not examined these works sufficiently to ascertain 

 whether the authors consider their arrangements as ascending or descending. 

 I may as well remark here that, wliile I let my view as to the relative position 

 in the scale of being have wha*" I consider its dtie weight in my arrangement 

 of the groups, yet while so much uncertainty exists in regard to it, I consider 

 it of subordinate importance in classitication. I am satisfied that the Acri- 

 didcp- should connect with the PhasmidcB through Froscopia. I am also satis- 

 fied that the saltatorial families must remain together, consequently my arrange- 

 ment, or exactly the reverse — that of Burmeister and Scudder — must be 

 adopted ; and in either case the arrangement of the subdivisions of the Acri- 

 dice should be the same. 



It is my intention, if life and health are granted me, to supplement the 

 foregoing synopsis with a discussion of the generic forms of the North 

 American Acrididce, especially with reference to their relations to exotic 

 forms. 



EPHIPPIGERA (?), Hald. 



I have omitted this genus from the list, and have assigned it no regular 

 place in my synopsis, for the following reasons: I am wholly unacquainted 

 with it; there is a genus of this name belonging to the Locustidce, but I 

 know of no such genus in Acrididce; and because I am well satisfied, from 

 an inspection of the figure given by Haldeman, that his insect is but the pupa 

 of some species of (Edipoda, and, I am strongly inclined to believe, of CE. 

 coralUpes or one of the closely-allied species found in Mexico. Yet, in order 

 to make my work as complete as possible, I insert Haldeman's description. 

 32 A 



