20 
BIRDS OF COLORADO. 
BIBLIOGRAPHY OF COLORADO ORNITHOLOGY. 
The following list of publications, concerning the birds of 
Colorado, is believed to be practically complete with the follow- 
ing exceptions: No record has been made of the reviews or 
notices that have appeared of these publications. Some twenty- 
three articles have been omitted as being but incidental refer- 
ences and having no valuable bearing on the subject matter 
in hand. 
One important particular should be noted in regard to the 
following pages. While referring to the book or article by its 
title as a whole, the explanatory notes have reference to only 
that part of the work that deals with Colorado birds as such 
explicitly. All implied references have been neglected. Even 
such a broad and comprehensive statement as “found in the 
entire Rocky Mountain region” has not been deemed sufficient 
to warrant considering it a Colorado reference. No reference 
whatever is made to all that part of the publications that deals 
with other matters. 
The names of the authors are arranged alphabetically and 
the articles under each author in chronological order. 
Aiken, C. E. and Holden, C. H. Jr. Notes on the Birds of 
Wyoming and Colorado Territories. By C. H. Holden, Jr. 
with additional memoranda by C. E. Aiken. Proc. Post. 
Soc. Nat. Hist. XV. 1872,//. ig^-210. 
The paper is edited by T. M, Brewer who states that Mr. Holden’s notes 
are based on birds and eggs found “in the northern part of Colorado and south- 
ern part of Wyoming Territories.’’ As no record is given of the precise localities 
wnere each species was obtained, Mr. Holden’s notes cannot be quoted with any 
certainty as referring to Colorado. 
The records of Mr. Aiken were taken near Fountain, El Paso County, 
between November i, 1871 and May 1872, and formed an important contribu- 
tion to the knowledge of Colorado birds. The paper treats of 142 species, fully 
annotated, of which 59 are for the first time accredited to Colorado. 
Aiken, C. E. A Glimpse at Colorado and its Birds. Am. Nat. 
VII. 1873, p. 13. 
Field notes on 21 species of birds seen in October in El Paso County. 
Aiken, C. E. A New Species of Sparrow. Am. Nat. VII. 
1873. A 236. 
Description of Centronyx ochrocephalus since ascertained to be a syno- 
nym of A. bairdii. Taken in El Paso County, Colorado. 
