MUSEUM OF COMPARATIVE ZOOLOGY. 147 



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. 



The list given below is based on observations made on a journey 

 from Colorado City to Denver, during the first two weeks of August, 

 supplemented by a few notes made at Denver during the first week of 

 July. Probably five sixths of the species breed at the localities where 

 they were observed. Four days were spent in the neighborhood of 

 Colorado City, two at Lake Pass, and about ten days at Denver. The 

 distance between Colorado City and Denver is nearly one hundred 

 miles. The highest point is at Lake Pass, on the divide between the 

 Arkansas and South Platte Rivers, which is said to be about 7,000 feet 

 above the sea. Though really on the Plains, our road passed quite 

 near the foot-hills, and along the streams there was considerable timber. 

 We found here, as would be naturally anticipated, a fauna in many 

 respects peculiar, — a blending of that of the mountains with that of 

 the Plains. Most of the species found on the Plains extend to the 

 foot-hills, and even into the valleys between them. On the other hand, 

 many, belonging properly to the wooded region of the mountains, fol- 

 low the timber belts along the streams for some distance into the 

 Plains. We hence have here a far richer bird fauna, through the ad- 

 dition of the mountain species, than is met with on the Plains proper. 



TURDIDJE. 



1. Turdus migratorius. Tolerably common, especially along the 

 creeks in the foot-hills. 



2. Turdus Pallasi. Only observed on Monument Creek, at Lake 

 Pass ; altitude of the locality about 7,000 feet. 



3. Oreoscoptes montanus. Common on Dry Creek, ten miles south 

 of Denver. 



4. Mimus carolinensis. Common along the Fontaine-qui-bouit, near 

 Colorado City. Also seen in the Garden of the Gods, at Lake Pass, at 

 Denver, and on Bear Creek, about fifteen miles southwest of Denver, 

 behind the first foot-hills. 



5. Harporhynchus rufus. Observed near Colorado City, and obtained 

 on Bear Creek, in the foot-hills southwest of Denver. 



* From July 4th to 8th, and August 1st to 13th. 



