GUIDE TO THE 



GENERA AND CLASSIFICATION 

 OF NORTH AMERICAN ORTHOPTERA. 



ALL the seven families of Orthoptera are found in the United 

 States, but only the saltatorial families in any considerable vari- 

 ety, unless we may except the Blattidae. In the subfamilies how- 

 ever the case is different, for less than half of them occur within 

 our boundaries at all and a number that do occur are represented 

 only by a single (often introduced) species. The following list 

 will show the proportion that occur in the different families. 



Forficulidae 1 subfamily represented out of 1 recognized. 

 Blattidae 6 subfamilies " "11 " 

 Mantidae 2 " " " 6 " 

 Phasmidae 3 " " "12 " 

 Acridiidae 4 " " 9 " 

 Locustidae 6 " " "15 " 

 Gryllidae 6 " " " 6 " 

 a 



28 " " " 60 " 



It will be seen that even in the saltatorial families scarcely 

 more than half of the subfamilies occur, notwithstanding that all 

 the subfamilies of Gryllidae have representatives. The repre- 

 sentation is shown also to be very unequally distributed. 



The families of Orthoptera may be distinguished by the table 

 given on the next three pages. 



