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t.." . :.. . ThE CONDOR VoL. with characteristic energy opened an extensive correspondence with ornithologists in all parts of the state with the result that the following additional notes were placed at his disposal and incorporated into his work. A. W. Anthony: list of 226 spedes taken in Colorado. W. H. Bergtold: notes on 20 spedes taken in Routt County and at Denver. G. F. Breninger: list of 257 spedes taken in Larimer County. R. A. Campbell: list of 40 spedes noted at Boulder. E. B. Darnell: notes on 68 species observed in Routt County. H. G. Hoskins: notes on 58 species seen near Burlington, Kit Carson County. W. P. Lowe: list of 188 spedes found at Pueblo and in the Wet Mountains. Chas. F. Morrison: list of 332 species known to occur in Colorado. Win. Osborn: annotated list of 254 species identified by himself and W. G. Smith in the vicinity of Loveland. Capt. P.M. Thorne: annotated list of 160 species collected by himself at Ft. Lyon duri. ng a five year's residence. In 1898 Prof. Cooke publisht a supplement to the list, containing eleven ad- ditional new species and much valuable information regarding habits, distribution, etc. A second supplement publisht in 1900 contains a full account' of the observa- tions of Edwin Carter in Summit County and Middle Park covering 184 species, and also much valuable information based upon the more recent work of C. E. Aiken on the "Divide" between Colorado Springs and Denver. The second sup- plement adds 13 new species to the state list, making a grand total of 387 species recorded for Colorado-up to May, 1900. The bibliography of the two supplements contains 43 additional references to Colorado birds, and Prof. Cooke writes me under a recent date that 106 titles have been added to this since 1900, making a total (with the 182 references contained in the original list) of 331 titles in all up to the present time. In this connection it might be well to mention the standard works on American ornithology, that contain specific references to Colorado birds. Thus in Baird, Brewer and Ridgway's "History of North American Birds" we find specific Col- orado records for 54 species; in Bendire's "Life Histories of North American Birds" of 26 species; in Coues' "Key to North American Birds", 35 species; in Davie's "Nests and Eggs of North American Birds", 77 species; in Fisher's "Hawks and Owls of the United States", 12 species; in Maynard's "Eggs of North American Birds", 22 species; and in Ridgway's "Manual of North American Birds", 34 species. These numerous references however, have no bearing upon the historical phase of the subject, as they are nearly all based upon notes publisht previously, and mentioned before in this paper. In fact in this entire list of standard works less than half a dozen species are credited to Colorado for the first time, of which three species are given without any authority for the record. Their chief value lies in the wide publicity given these Colorado records owing to the widespread use of these books as reference works. You are probably aware of the progress of ornithological work in the State during the past eight years. Most of the pioneer naturalists are gone, or are carry- ing on their observations in other states, and their places have been taken by a newer coterie of students among whom the members of this society are represented. Beside our own members the names of Horace G. Smith, Ferril and Felger at Denver, Henderson at Boulder and a few others are familiar to us all. The work of Smith and Ferril for the State Historical Society is worthy of especial attention _in this connection because it is in accord with a point which I