of the North American Orthoptera. 413 



For more easy reference I have prefixed an asterisk (*) 

 to such species as I have seen from New England. In 

 giving localities, I have only referred to those from which 

 I have myself seen specimens, and have appended to them 

 the names of the collectors ; or where that was not known, 

 the person from whom I received them. 



I add here a Table for the more ready determination of 

 the genera, which I have made as simple and concise as 

 possible. It is strictly limited to the genera of New Eng- 

 land, and is not intended for reference to the species out- 

 side its limits. 



A TABLE TO FIND THE GENERA OF NEW ENGLAND ORTHOPTERA. 



1. Hind legs longest; hind femora thickened 4 



1. Legs of nearly equal length; hind femora not thickened ... 2 



2. Abdomen armed behind with a forceps . . . (Forficularice) 6 



2. Abdomen not armed behind with a forceps 3 



3. Body broad and flat (Blatlarice) 7 



3. Body long and exceedingly slender, with slender legs. (Phasmida) 



Diapheromera. 



4. Antennaj long and tapering 5 



4. Antennae short . (Acrydii) 23 



5. Wing covers with the outer portion bent abruptly downwards. ( Gryllides) 11 

 5. Wing covers sloping downwards at the sides . . (Locuslarice) 15 



FORFICULARICE. 

 6. Antennae with less than 12 joints Labia. 



6. Antennae with more than 20 joints Labidura. 



BLATTARI^E. 



7. Winged 8 



7. Wingless Pycnoscelus. 



8. Females with developed wings ......... 9 



8. Females with rudimentary wings Stylopyga. 



9. Basal joints of tarsi longer than the others 10 



9. Basal joints of tarsi shorter than the others Ectobia. 



10. Supraanal plate deeply fissured Periplaneta. 



10. Supraanal plate not deeply fissured Platamodes. 



GRYLLIDES. 



11. Fore-tibiae broad 12 



11. Fore-tibiae slender . 13 



12. Insect large Gryllotalpa. 



12. Insect small Tridactylus. 



13. Hind-femora stoutish ........... 14 



13. Hind-femora slender (Ecanthus. 



