Yi INTRODUCTION. 



instances given by Sa}', and have no evidence that they are fonnd within the 

 region herein considered. 



The results of my own labors have been measurably increased by the following 

 collections which I owe to the kindness of friends, and to the Smithsonian Insti- 

 tution : — 



1. Collections brought by Lieut. Beckwith's expedition; among which were two 

 new species; Cleonus cmgularis, and Coelocnemis punctatus Lee. (Proc. Acad. Nat. 

 Sc. Philad., VII, 225). The genus Coelocnemis was not previously known east of 

 California, where it is represented by several species; suspecting that it was collected 

 inside of the Great Basin, I have excluded it from the catalogues here given. 



2. A large number of specimens collected in Eastern Kansas, by Mr. M. Burke, 

 and presented to me through Dr. John Torrey. 



3. A very large collection made at Fort Riley, Kansas, by Dr. W. A. Hammond, 

 U. S. A., and John Xantus, Esq. 



4. Collections from the mouth of the Yellowstone river, and from the Loup Fork 

 of the Platte, made by Dr. F. V. Hayden, and received from the Smithsonian 

 Institution. 



6. A collection made by Dr. Wm. A. Hammond, on the route from Fort Riley 

 to Bridger's pass. 



6. Similar collections made by Dr. John G. Cooper, received from the Smith- 

 sonian Institution. 



The materials received from Eastern New Mexico are much more scanty, and ai'e 

 as follows : — 



1. Four or five hundred specimens collected near Santa Fe, by Mr. Fendler, and 

 procured for me by the kind offices of Dr. Engelmann. 



2. Specimens collected by Dr. Wislizenus, on a journey from Santa F6 to Chi- 

 huahua ; though few in number, these specimens were very interesting in character, 

 and I have availed myself of the present opportunity to figure some of them, 

 though they are possibly not found within this province of the Central district, but 

 belong rather to the southwestern province. 



3. A small, but very interesting collection made in the vicinity of Santa F^, by 

 the late R. C. Kern, and given me by Prof. S. S. Haldeman. 



These materials were used in preparing articles for the reports of the expeditions 

 of Capt. E. G. Beckwith, and Capt. J. Pope, U. S. A., in Pacific R. R. series, but 

 were excluded from want of room, and are now incorporated together, with the 

 addition of several new species since obtained from various sources. 



The six provinces of the Atlantic district are marked on the map by red tints ; 

 the two provinces and two subprovinces of the Central district proper by green ; 

 the two southern provinces of the supposed Interior district by brown ; and the 

 four provinces thus far ascertained of the Pacific district by blue tints. 



