LOCUSTIDAE STENOPELMATINAE 57 



e 2 . Descending lobes of pronotum short, vertical, the 



dorsum broad. . . . Plagiostira Scudder. 



c 2 . Fore tibiae with only one spine above on outer margin, 



situated at apex Ateloplus Scudder. 



About half these genera are represented by only one or two 

 species each ; the others have more, but none of them probably 

 much above a dozen. They are almost exclusively found west of 

 the Mississippi and particularly in the elevated plateau of the Cor- 

 dilleras, but Atlanticus has three species which are found only 

 east of the Mississippi and especially upon the Atlantic slope, and 

 a single species or two of Orchesticus, the most prolific of the 

 genera, occur on the Atlantic slope. Apote, Idiostatus, Idionotus 

 and Ateloplus are only known west of the Sierra Nevadas and 

 the same is the case with most of the species of Cacopteris. 

 None of our genera occur in the Old World. 



GBYLLACRINAE. 



This subfamily is represented by only a single apterous genus, 

 Neortus Brunner, one species of which occurs in Carolina. 



STENOPELMATINAE. 



Brunner has divided this subfamily into two sections (unnamed), 

 which I have here regarded as tribes. Both of them occur with 

 us, but the former only by one of the twenty-four genera into 

 which the section is divided by Brunner, most of them being Old 

 World types. 



Tribes of Stenopelmatinae. 



a 1 . Tarsi provided with pulvilli; inserting angle of the hind 

 femora situated on the outer side. . . Stenopelmatini. 

 a 2 . Tarsi without pulvilli ; inserting angle of the hind femora 

 situated on the inner side. . . . Rhaphidophorini. 



Stenopelmatini. 



Represented only by the uncouth genus Stenopelmatus Bur- 

 meister, three species of which have been described from the 



