Vol i909" VI ] Cooke, The Birds of Colorado. 401 



Colorado is 248. Among the species dropped from the State, the 

 following five had been counted among the breeders: PhaUmoptilus 

 nuttalli nitidus, Astragalinus psaltria arizonoe, Spizella passerina, 

 Dendr&ica cestiva sonorana, and Sitta carolinensis. The list of 

 breeders has had ten additions: Marila aniericana, Marila vallis- 

 neria, Marila affinis, Pedicecetes phasianellus columbianus, Dryo- 

 bates villosus, Cyanocitta cristata, Agelaius phamieeus nevfrali.s; 

 Icterus 8purius, Peuca>a cassini, and Vireo belli. 



The Bibliography of Colorado Ornithology. 



The original bulletin contained the titles of 182 articles on 

 Colorado birds, to which were added 15 in the first supplement and 

 28 in the second — a total of 225 titles. Publications on Colorado 

 ornithology have become increasingly abundant during the past 

 few years and the following pages mention 114 titles, nearly all of 

 which have appeared within the last nine years, i. e., half as many 

 articles have been written about Colorado birds in the last nine 

 years as in the preceding seventy years. The statement was made 

 in the original bulletin, that 23 titles had been omitted as being 

 only incidental references to Colorado birds. This number can 

 now be increased by 62 additional articles that make some state- 

 ments or contain some records of Colorado birds, but are not 

 considered of enough importance to be listed here individually. 



The bibliography of Colorado ornithology stands at present 

 therefore as follows. 



More important titles to 1900 . . 225 



Additional titles 1900-1909 . . 118 



Less important titles .... 91 



Total .... 434 



The following list contains in chronological order, the more ex- 

 tended and important articles on the birds of Colorado that have 

 been published since 1900, and also a few issued previously that 

 were not noted in ' Birds of Colorado.' 



Abert, J. W. Report of the expedition led by Lieutenant Abert on 

 the upper Arkansas and through the country of the Camanche Indians 

 in the fall of the year 1845. Journal of Lieutenant J. W. Abert, from 

 Bent's Fort to St. Louis in 1845. 29th. Cong., First Session, Sen. Doc. 

 VIII, No. 438, 184G, 1-75. 



