GEOLOGICAL SUEVEY OF THE TERRITORIES. 423 



Limnotrechus, Stal. 



L. 7narginattis, Say, (Hemipt., New Harmony, ]). 36, No. 2.) — From Snake 

 Eiver, Idaho. 



Family Naucokid^. 



AmhrysuSj Stal. 



A. Sifjnoreti, Stal., (Stettiner En torn. Zeitung, 1862, vol, XXIII, p. 

 460.) — From Eed Butte and near Fort Fetterman. The specimens origi- 

 nally described were from Mexico. It is the most beautiful sx)ecies 

 thus far discovered in North America. 



NOTES ON THE SALTATORIAL ORTHOPTERA OF THE ROCKY 



MOUNTAIN REGIOiNS. 



By Propessor Cyrus Thomas. 



I._SOUE0ES OF INFOEMATIOX. 



Having had the opportunity during the last three summers of travel- 

 ing over much of the Eocky Mountain region, in connection with the 

 United States Geological Survey of the Territories, conducted by Pro- 

 fessor F. V. Hay den, I have been enabled to make large collections of 

 OrtJioptera. It is true that the opportunity for studying the habits of 

 the various species has been limited, as we are constantly moving from 

 point to point while in the field. Yet I have collected considerable in- 

 formation in regard to the distribution and the comparative numbers of 

 the ditferent species, especially of the two families of the saltatorial 

 Ortho])tera^ to which my attention has been more particularly directed, 

 LocustidoB and Acriduke. During these three seasons I have visited 

 the following Territories, to Avit : New Mexico, Colorado, Wyoming, 

 Utah, Idaho, and Montana, making collections in each. 



In addition to my own collections I have had access to and free use 

 of the collection made by Dr. Palmer in Northern Arizona, and to some 

 collections in the Agricultural Department made by various persons in 

 different parts of the West. I am also indebted to Mr. Taylor, of San 

 Francisco, for some valuable California specimens, among which I found 

 four new species. Mr. Charles R. Dodge, Assistant Entoo:iologist of the 

 Agricultural Department, who visited Nebraska, Colorado, and Kan- 

 sas during the past summer, very kindly submitted his entire collection 

 of Orthoptera to my use. Froin this I obtained several species which 

 have not hitherto been described. 



Several of my new species have been figured by Professor T. Glover, 

 and will be found among the numerous plates of insects placed on exl;i- 

 bition in the museum of the Agricultural Department, where, also, the 

 type specimens are deposited. I am indebted to Mr. S. I. Smitli, of 

 Connecticut, for a suit of New England Acrididcc for comparison ; to 

 Theo[)liihis Eogan, esq., of Busselviile, East Tennessee, for {Specimens 

 of Orthoptera from that section, enabling me to veriiy sonie of De 

 Haan's names; and also to Mr. J. Middleton, of Northwest Pennsyh'auia, 

 for sx)ecimens from that mountain section. 



