GEOLOGICAL SUEVEY OF THE TEREITOEIES. 



429 



Fifth group, Goiioeephalini. 

 Conoceplialus 2 species. 



Sixth group, Phaneropterini. 



Phaneroptera 2 species. 



Ephi]3pit3' tha 1 species. 



ACRIDID^. 



I. Siih-family Aceidin^. 



First group, Truxalini. 

 Opomola 4 species. 



Third group, Acridini. 



Acridium 3 species. 



Calopteuus 10 species. 



Pezotettix 5 sx)ecies. 



Fourth group, Oedijjodini. 



Brachypeplus 1 species. 



Boopedon , 2 s])ecies. 



StauroDotus 1 species. 



(Edipoda 26 species. 



(Gryllus formosus) 1 species. 



Acrolophitus 1 species. 



Stenobothrus 6 species. 



Oxycoryj)hus 1 species. 



If we divide that part of the United States west of Missoun into 

 three districts, as follows: the eastern, that portion east of the dividing 

 range of the Eocky Mountains ; the middle, that between the Eocky 

 Mountain and Sierra I^evada Eanges ; and the western, that west of 

 Sierra Nevada, the following tables will show the distribution of the 

 species described between these three districts : 



EASTERN DISTEICT. 



Gryllus personatus, Scudd. 

 abbreviatus, Serv. 

 Oecanthus niveus. 

 Kemobius vittatus. 

 Stenopelmatus fasciatus, Tbos. 

 Ceuthophilus divergens, Scudd. 



pallid us, Thos. 



gracilipes, Scudd. 

 Udeopsylla robusta, Hald. 

 Daihinia brevii)es, Hald. 

 Anabrus similis, Scudd. 



purpurascens, Uhl. 

 Coloradiis, Thos. 

 Pterolepis (?) Haldemannii, Gir. 



Stevensonii, Thos. 



minutus, Thos. 

 Thamnotrizon scabricollis, Thos. 



Decticus (?) trilineatus, Thos. 



Orchelimum (?) 



Xiphidium saltans, Scudd. 

 Conocephalus attenuatus, Scudd. 



crepitans, Scudd. 

 Phaneroptera curvicadua. 

 Ephippitytha gracilipes, Thos. 

 Ox}omola brachyptera, Scudd. 

 bivittata, Serv. 

 I^eo-mexicana, Thos. 

 Wyomiugensis, Thos. 

 xlcridinm eniargiuatum, Uhl. 

 frontalis, Thos. 

 ambiguum, Thos. 

 Oalox)tenus viridis, Thos. 

 bivittatus, Uhl. 

 Dodgei, Thos. 



