GEOLOGICAL SUEVEY OF THE TEEEITOEIES. 423 



Limnotrechus, Stal. 



L. marginatus, Say, (Hemipt., New Harmony, p. 36, Ko. 2.) — From Snake 

 Biver, Idaho. 



Family Naucorid^. 



Ambrysus, Stal. 



A. Signoreti, Stal., (Stettiner Entom. 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 species 

 thus far discovered in North America. 



NOTES ON THE SALTATORIAL ORTHOPTERA OF THE ROCKY 

 MOUNTAm REGIONS. 



By Professor Cyrus Thomas. 

 I._SOUECES OF INFOEMATION. 



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. Hayden, I have been enabled to make large collections of 

 Orilwptera. 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 different species, especially of the two families of the saltatorial 

 Ortlwptera, to which my attention has been more particularly directed, 

 Locustidw and Acrididce. During these three seasons I have visited 

 the following Territories, to wit : 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 E. Dodge, Assistant Entomologist of the 

 Agricultural Department, who visited Nebraska, Colorado, ^nd Kan- 

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

 of Ortlio])tera to my use. From 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 exhi- 

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

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

 Connecticut, for a suit of New England Acrididce for comparison 5 to 

 Theophiliis Eogan, esq., of Eusselville, East Tennessee, for specimens 

 *of Orthoptera from that section, enabling me to verify some of De 

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

 for specimens from that mountain section. 



