The Rocky Mountain Locust. 



CHAPTER I. 



CHARACTERS OF THE SPECIES. 



The Rocky Mountain Locust belongs to the Order of 

 Straight-winged Insects ( Orthoptera), and to the Family 

 Zocustidce, Westwood.* It is the Caloptenus spretus of 

 Thomas,f and comes to perfection only in the plains re- 

 gions of the Rocky Mountains and of the Northwest. 



EASILY CONFOUNDED WITH THE RED-LEGGED LOCUST. 



The western farmer is too familiar with the insect under 

 consideration to need any detailed description of it. Yet 

 this work will doubtless come into the hands of many who 

 have yet formed no personal acquaintance with the pest, 

 but who nevertheless, for one reason or another, desire to 

 become familiar with its appearance. There are also sev- 

 eral allied species which are apt to be confounded with it, 



* Acridii, Latreille. 



+ The species was named in MS. by Mr. P. E. Uhler, of Baltimore, Md., but 

 never by him described. Mr. B. D. Walsh subsequently (Practical Entomologist, 

 II, p. 1,) adopted Mr. Uhler' s name in connection with a partial description; but 

 Mr. Thomas first fully defined the species, as here distinguished and referred to 

 by me. 



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