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Jan., 1909 HISTORY OF COLORADO ORNITHOLOGY [ ? ' oo ?i? : in the vicinity of Colorado Springs, and, in connection with the extensive observa- tions of C. E. Aiken at Fountain and other points, covers the bird life of El Paso County thoroly. The Aiken notes mentioned before, which were publisht in 1873, include 142 species observed in El Paso County. In 1883 H. D. Minor publisht a list of 44 species observed in Boulder County (and at Manitou, E1 Paso County), and this list, together with the list of the Maxwell collection publisht by Ridgway, and the copious notes of Dennis Gale publisht in Bendire's "Life Histories", constitute the great bulk of pub- lisht information regarding the birds of Boulder County. In 1885 C. W. Beckham publisht a "List of the Birds of Pueblo County" containing 91 species, to which he added 22 additional species in a supplementary list publisht two years later. Beside the work of Beckham in Pueblo County W. D. Lowe did much work there, and among other things publisht a list of the dates of arrival of 70 species. Herman W. Nash, Capt. D. P. Ingraham and P. L. Jones also did valuable field work there, altho very little of the results of their observations was publisht until they appeared in Cooke's "Birds of Colorado." In 1886 C. F. Morrison publisht a list of 31 species observed at Fort Lewis, La Plata County, and two years later he publisht a "List of the Birds of La Plata County" containing notes on 116 species, which probably included the notes used in the former paper. In 1889-90 V. L. Kellogg publisht a list of the summer birds of Estes Park, Larimer County, containing 89 species, and this was followed in 1896 by a list of 76 species observed by Richard McGregor. In 1894 W. D. Lowe publisht a list of the birds of the Wet Mountains, Huerfano County, containing 76 species, and giving much valuable information regarding their vertical distribution. In 1896 Horace G. Smith publisht a list of 35 species mostly water birds, observed in the vicinity of Denver, nine of which are recorded from Colorado for the first time. Mr. Smith also publisht in 1893 a list of 32 species observed in the city of Denver. This in substance was the status of publisht local knowledge up to the time that W. W. Cooke publisht his "Birds of Colorado" in 1897. I do not mean to imply that these authorities were by any means the only ones at work in the State, for a number of well known ornithologists were at work in different places, who up to this time had not publisht the results of their observations in a comprehen- sive manner. Breninger, W. G. Smith and Osborn in Larimer County, Dille in Weld C6unty, Horace G. Smith at Denver, E. L. Berthoud at Golden, Capt. P.M. Thorne at Fort Lyon, Edwin Carter in Summit and Grand Counties, and several others in various parts of the State were doing systematic field work; but up to this time (that is 1896-7) their notes as a whole were not available to the public. It way be mentioned in this connection that a great deal of this information has not been publisht up to this time. In 1897 Prof. W. W. Cooke publisht as a Bulletin of the State Agricultural College "The Birds of Colorado s' which up to the present date is by far the most complete and comprehensive work on Colorado birds. This publication which contains fully annotated records of 363 species is a careful compilation of all the work done in the State and contains, beside this, the first and only complete bibliog- raphy of Colorado ornithology, as well as a very comprehensive outline of the his- tory of the subject, to which I am indebted for much of the data contained in this paper. In addition tO the great amount of data mentioned he. retofore, Prof. C?ook?