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26 THE CONDOR VOL. XI then Assistant Secretary of the Smithsonian Institute, and incorporated into the ninth volume of the Pacific Railroad Reports. Some additional notes were included in Volume X. The total number of species recorded for the first time from Colorado in the Pacific Railroad Reports was twenty-three, and these, together with the eleven species recorded by Say, or thirty-four species in all, constituted the entire check- list of Colorado, with the exception of one species added by Baird in 1870, at the time Dr. J. A. Allen visited the State in 1872, and to his untiring efforts while within our State we owe the first important step in the development of our ornitho- logical knowledge. The results of his observations, which were publisht in 1872 as a Bulletin of the Museum of Comparative Zoology under the caption of "Notes of an Ornithological Reconnoissance of portions of Kansas, Colorado, Wyoming and Utah," contained the first local list ever publisht of Colorado birds and added eighty-four species not before recorded for Colorado. Shortly after, and during the same year that Dr. Allen's paper appeared, the vast amount of material and information which had been collected by Mr. C. E. Aiken during several years previous to 1872 were publisht as Proceedings of the Boston Society of Natural History under the title of "Notes on the Birds of Wy- oming and Colorado Territories," by C. H. Holden, Jr.., with additional memo- randa by C. E. Aiken. This paper was edited by Prof. T. M. Brewer, with the statement that Mr. Holden's notes were taken in northern Colorado and southern Wyoming, but as no precise localities are given in Mr. Holden's notes they are not available as actual Colorado records. Mr. Aiken's notes, however, t-reat of 142 species, 59 of which are new records for Colorado. It is unfortunate that Mr. Aiken's notes were not publisht previous to those of Dr. Allen, as many of the species recorded for the first time by Allen were observed by Aiken before they were by Allen, thus depriving Aiken of the honor of their discovery, which, thru his unfailing efforts in the interest of ornithology, he so richly deserved. Mr. Aiken's observations constitute the greatest amount of information gathered by any one man on this subject, and the paper just mentioned contains the first account of the winter movement of our birds. In 1873 Mr. Robert Ridgway publisht in the Bulletin of the Essex Institute the first list of Colorado birds. This list contains 243 species, of which 59 are recorded for the first time from Colorado. It is purely a compilation, based upon the field notes of 'various naturalists; the greater part of the list is based upon the notes of Mr. Aiken, while many of the species were included on the authority of Henshaw, whose work did not appear until two years later, and a few species were included upon the strength of their occurrence in the Maxwell Collection, altho a complete list of the birds in this famous collection was not publisht until 1877. In 1874 Dr. (then Capt.) Elliott Coues publisht (as a United States Geolog- ical Survey bulletin) "Birds of the Northwest," which plays an important part in our subject, asit contains the only publisht account of the material collected by Stevenson on the trip made by Dr. Hayden's party in 1869. This party started from Cheyenne, worked south as far as Denver, thence west across the range into Middle Park,. and back to Denver and south along the edge of the foothills into New Mexico. "Birds of the Northwest" also contains the very complete notes of Mr. T. M. Trippe on the birds of Idaho Springs and vicinity. In 1873 Mr. H. W. Henshaw made prolonged visits at Denver and San Luis Valley, and in 1874 Mr. Aiken as his assistant made large collections in the vicin- ity of Colorado Springs, and Pueblo, and from there thru the San Luis Valley as far west as Pagosa Springs. The results of these investigations were publisht in