The Birds of El Paso County^ Colorado 471 



Wyoming and Colorado Territories. Proc. Boston Soc. 

 Nat. Hist., XV., 1872, pp. 193-210. This was edited by 

 Dr. T. M. Brewer, and only the notes signed "C. E. A.," 

 contributed by Aiken, refer to Colorado. They are the 

 results of the field work of his first winter and spring in 

 Colorado (1871-72), and which was practically all done at 

 his ranch on Turkey Creek, southwest of Colorado 

 Springs. 59 species are credited to the State, in addition 

 to those hitherto known to occur here. 

 Aiken, C. E. A Glimpse at Colorado and its Birds. Amer. 

 Nat., VII, 1873, p. 13. Notes on birds seen on an October 

 day on Beaver Creek. 



Aiken, C. E. A New Species of Sparrow. Amer. Nat., VII, 

 1873, pp. 236-7. Centronyx ochrocephalus described from 

 type taken on plains 14 miles east of Fountain, about 

 October 5, 1872. This proved to be identical with Cen- 

 tronyx (now Ammodramus) bairdi, and was practically a 

 rediscovery of that species. 



Aiken, C. E. The Nidification of the Blue Crow [Pinon Jay] 

 and the Gray-headed Snowbird. Amer. Sport. V. 1875, 

 p. 370. The first account of the nests and eggs of these 

 two species. 



Aiken, C. E. Seven New Birds for Colorado. Auk, XVII, 

 1900, p. 298. Adds as new to the state fauna Gavia arctica, 

 from Colorado Springs ; Ardea egretta, 5 miles south of 

 Colorado Springs ; Syrnium nebulosum, Holyoke ; Astra- 

 fjalinus tristis pallidus, Colorado Springs ; Geothlypis 

 agilis, Lake, Lincoln Co. ; Geothlypis trichas, Colorado 

 Springs (this specimen is now referred to G. t. occiden- 

 talis) ; Wilsonia canadensis , Lake, Lincoln Co. 



Allen, J. A. Notes of an Ornithological Reconnaisance of 

 portions of Kansas, Colorado, Wyoming and Utah. V. 

 List of Birds observed at the Eastern Base of the Rocky 

 Mountains in Colorado Territory, between Colorado City 

 and Denver, in July and August, 1871 ; with Annotations. 

 Bull. Mus. Comp. Zool., Ill, 1872, pp. 113-183. A very 



