OVER THE DIVIDE AND BACK 121 



the western side that I had not previously seen on the 

 eastern side, although a longer and minuter examination 

 would undoubtedly have resulted in the discovery of a 

 few species that are peculiar to the regions beyond the 

 range. In the extreme western and southwestern por- 

 tions of Colorado there are quite a number of species 

 that are seldom or never seen in the eastern part of the 

 State. However, keeping to the mountainous districts, 

 and given the same altitude and other conditions, you 

 will be likely to find the same kinds of feathered folk on 

 both sides of the range. A few concrete cases will make 

 this statement clear. The elevation of Glenwood is 

 five thousand seven hundred and fifty-eight feet ; that 

 of Colorado Springs, five thousand nine hundred and 

 ninety-two feet ; and the climatic conditions otherwise 

 are practically the same. Hence at both places the 

 following species were found : Lazuli buntings, Arkansas 

 goldfinches, American goldfinches, western wood-pewees, 

 Arkansas king-birds, Bullock's orioles, grassfinches, and 

 catbirds. At the same time there were a number of 

 species in both localities that have a more extensive ver- 

 tical range, as, for example, the western robins, which 

 were seen in many places from the bases of the moun- 

 tains up to the timber-line, over eleven thousand five 

 hundred feet above sea-level. 



The presence of practically the same avian fauna on 

 both sides of the great range suggests some speculations 



