CHAPTER VIII. 



The following notes upon the distribution of these butterflies have been 

 largely made out from data furnished by Dr. H. C. Yarrow, of the expedi- 

 tion. The observations upon the Colorado species were made by me during 

 the summer of 1871. 



My thanks are due to Henry Edwards, esq., of San Francisco, for 

 notes upon some species whose habits were unknown to me. These will 

 be found under the headings of the respective species. 



All the Diurnal Lepidoptera taken by the expedition were confided to 

 W. H. Edwards, esq., of Coalburgh, W. Va., for determination ; and his 

 original descriptions of the new species discovered by the expedition have 

 been introduced in their appropriate places in this report. Descriptions by 

 the same author of one or two other species have been reprinted here where 

 there were special reasons for it; but it was not thought necessary to give 

 descriptions of all, since much the larger number are contained in the pro- 

 ceedings of two or three societies, which are readily accessible to most ento~ 

 mologists who would be likely to possess Rocky Mountain butterflies. 



In regard to the synonymy, only those names have been given con- 

 cerning which any doubt is likely to arise, since synonyms which have 

 been entirely disused for half a century or more would uselessly encumber 

 the pages of any work, except a mere synonymic list, the more so as the 

 entomological world now displays such activity in the production of books 

 of this latter class. 



The reference immediately following the name of the species is to the 

 best description or figure readily accessible to American students. 



One hundred and twenty-one species are now known to inhabit Colo- 

 rado ; in 1867, but seventy-two were recorded as from the Rocky Mountains. 



For convenience of reference, a sign (t) is prefixed to species not 

 known to be found in Colorado. 



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