156 



THE CONDOR 



Vol,. X 



tract lying south of the Grand River and west of the Gunnison, and as the Dolores 

 forms a natural highway for southern forms to wander into the County, it is not 

 unreasonable to suppose that a number of species occur with more or less regular- 

 ity in the southern end of the County, which have not yet been observed 

 or recorded. 



Partly on this account and partly on account of the unavoidable incomplete- 

 ness of this list, the writer has included in the body of the list, but in brackets and 

 smaller type, those species whose established range undoubtedly includes Mesa 

 County, and whose seasonal movements make their occurrence within the county 

 boundaries a practical certainty at some time of the year. The authority for in- 

 cluding these hypothetical species in the list is derived from the ranges given in 

 Prof. W. W. Cooke's Birds of Colorado, and the list of these species has been 

 further passed upon by him, with particular reference to Mesa County. This 

 feature of the list has been included simply as a guide in field work and as an aid 



LEON PEAK, THE HIGHEST POINT IN MESA COUNTY, 10,954 FEET ALTITUDE 



to intelligent efforts in clearing up the many points of uncertainty regarding Mesa 

 County Ornithology. 



The entire list as it stands includes 203 species, 159 of which have been defin- 

 itely recorded for Mesa County, while the remaining 44 species altho not having 

 been found within the County boundaries up to the present time, will probably be 

 reported from there in the future. 



ANNOTATED LIST 



[^chmophorus occidentalis. Western Grebe.. This western species is an abundant 

 summer resident in Utah and has been seen in vSouth Park by Carter, so probably occurs regu- 

 larly in ^NlesaCount}- during migration, tho never in any abundance.] 



Colymbus nigricollis calif ornicus. American Eared Grebe. Summer resident, 

 not common. This species is undoubtedly a regular migrant, but the writer has 

 only seen it once. Mr. Floyd Smalley reports it as a regular summer resident at a 

 small reservoir in Plateau Valley at about 6500. 



