152 THE COXDOR Vol. X 



juveniles seen in the mountains in July, and four of the same noticed along the 

 river July 28. 



Sialia mexicana bairdi. Chestnut-backed Bluebird. A few seen in March 

 along the river. Several noticed in the mountains. The location seemed favorable 

 but their scarcity was quite noticeable. 



Sialia arctica. Mountain Bluebird. Six seen one day in July among the pin- 

 yons. Possibly a family. Their absence from the higher part of the mountains 

 seemed strange. 



Saca/on, Arizona. 



AN ANNOTATED LIST OF THE BIRDS OF MESA COUNTY, COLORADO 



By ROBERT B. ROCKWELL 



WITH TWO MAPS AND NINE PHOTOS BY THE) AUTHOR 



IN undertaking the compilation of an annotated list of the birds of Mesa County, 

 Colorado, it has been the purpose of the writer to collect such information as' 



might be available relating to this subject, with a view to preserving these 

 pioneer observations and thus furnishing a skeleton around which future observers 

 may build a complete Ornithological structure. 



In placing this list before the reader, the writer wishes to emphasize the fact 

 that it is purely preliminary; the amount of work he has done in the County, tho 

 comparatively small, forces upon him a full realization of the remarkabl}^ small 

 amount of information existing, regarding the bird life of the County, and also of 

 its great possibilities along Ornithological lines on account of its geographical 

 position and varying topography. 



The information contained herein has been secured by an extensive correspond- 

 ence covering a period of about fifteen months during which time every probable 

 source of information on the subject which has come to the writer's knowledge has 

 been investigated and the information thus secured embodied in this list. Added 

 to this information are the observations of the writer covering two entire 

 years and portions of the six intervening years between 1897 and 1905, about one- 

 half of which time was spent within the confines of the County and during which 

 time 109 species were encountered and a close study made of the commoner varieties. 



In response to requests for information the writer has received generous and 

 efficient assistance from the following persons and he wishes to take this opportu- 

 nity to express to them his gratitude and appreciation of the valuable notes so 

 willingly furnished. 



To Prof. W. W. Cooke, U. S. Biological Survey, Washington, D. C, to 

 whom the writer is indebted for a working model (Cooke's Birch of Colorado 

 being followed as closely as possible both as to contents and to form), the 

 entire list as completed w^as sent for correction and criticism. Prof. Cooke, after 

 carefully examining the manuscript of the list, added nine new species and impor- 

 tant notes on several already included in the list. 



Mr. Richard H. Sullivan, Local Forecaster, U. S. Weather Bureau, Wichita, 

 Kansas, formerly of Grand Junction, Colorado: An annotated list of 93 species, 

 observed in that vicinity during about three year's residence, and containing among 

 much other valuable information a very complete record of dates of arrival and de- 



