41 



In this arrangement the two groups, Xiphoceridse and Panipliagidte, 

 given by some authors are included in Xiplioccriui, as the differences between 

 the t^^•o do not appear "sufficient to raise them to the dignity of groups ; but 

 I confess my hack of acquaintance witli the generic forms belonging to these 

 divisions. 



All of these groups, except the first, third, and seventh, have representa- 

 tives in North America, and also in the more limited Orthopteral fauna of the 

 United States, as will be seen hy reference to the following synoptical table 

 of genera: 



Classification of North American Genera* 



I. — Sub-fam. AcRiDiNiE. 



Group 1. — Proscopini. 

 Has no representatives iu Noitb Aiuerica. 



Group 2. — Tryxalini. 



Genera: Tryxalis, Acburuiu, 21csnps, Opomala, Ichtbydion, Pegasidiou, Spbena- 

 rium, Pyrgoinorplia. 



Group 3. — Trigonopterygini. 

 Has no representatives in Xortb America. 



Group 4. — CEdipodini. 

 Genera : Hippiscus, Macbrerocera, Oxijconjplius, Chrysochraon, Acrolophltm, Pedi- 

 osccrtetes, Stcnolothrus, Qomphocerus, Stetlieophi/ma, Tragocephala, Tomonotus, (Edipoda, 

 Tropidolnphus, Hippopedon, Stauronotus^ Leprus, Boopedon, Bracliypeplus. 



Group 5. — Acridiiii. 



Genera: Dactylotum, Pezotettioo, Plafyphyma, Ommatolampis, Calopfenus, Pcepedetes, 

 Pedies, Calacris, Chromacris, Acridiicm, Tropidacris, Lopbacris, Monacbidium. 



Group 6. — Xiphocerini. 

 Genera : Bhomalea, Xipbocera. 



Group 7. — rhymatini (/). 

 Has no representatives in Nortb America (?). 



II. — Sub-fam. Tettiginje. 



Group 8. — Tettigini. 

 Genera : Tcttix, Tittigidea, Batrachidea, Cboripbyllum. 



I do not feel any great confidence in regard to the position of the follow- 

 ing genera, named by Mr. Saussnre, as I have seen neither figure nor speci- 



Tbe genera in italics are represented in tbe United States fauna. 



6 A 



