232 UNIVERSITY OF COLORADO STUDIES 



418. Phalaenoptilus nuttallii — Poor-will. 



Summer resident. Gale noted it but twice, both times near Gold Hill in 1889. Re- 

 ported by Blanchard in Boulder Canyon in 1903 and by Sprague at Magnolia in 1898. 

 420a. Chordeilus virginianus henryi — Western Nighthawk. 



Abundant summer resident from plains to 8,000 feet, common up to 10,000 feet or 

 higher. Gale found it nesting up to 9,500 feet. Have seen it in Boulder as late as Sep- 

 tember 26, in 1905. On August 24, 1907, 1 counted over 50 in a flock flying southwestward 

 over Flagstaff Mt., at Boulder. A few of these useful birds nest on fiat roofs of Boulder 

 business houses. 

 [422. Cypseloides niger borealis — Black Swift. 



Gale includes this in his manuscript list of Boulder County birds, but nowhere in his 

 notes mentions actually taking or even seeing it. Therefore, as it is a species of south- 

 western Colorado, the record cannot be safely accepted without further information.] 

 425. Aeronautes melanoleucus — White-throated Swift. 



Summer resident of foothills and mountains, not common. Reported by Blanchard 

 and found nesting several times by Gale, a pair taken by the latter in Left Hand Gulch, 

 June 30, 1886, being in Felger's cabinets. Minot says rare about Boulder. 

 [429. Trochilus alexandri— Black-chinned Hummingbird. 



The remarks on the black swift apply also to this species, except that it is found 

 probably further north in the western part of the state.] 



432. Selasphorus platycercus — Broad-tailed Hummingbird. 



Common summer resident from edge of plains nearly to top of range. Most abundant 

 at 9,000 to 10,000 feet. 



433. Selasphorus rufus — Rufous Hummingbird. 



One taken near Boulder by Gale and one in Mrs. Maxwell's collection with no locality 

 label. 

 444. Tyrannus tyrannus — Kingbird. 



Common summer resident of plains and foothills. 



447. Tyrannus verticalis — Arkansas Kingbird. 



Have seen but three at Boulder, May 30, 1906. Gale found them common in eastern 

 part of county, nesting. The distribution of this species in northern Colorado is difficult 

 to understand. It is abundant to the southeast and northeast of Boulder County. 



448. Tyrannus vociferans — Cassin Kingbird. 



One taken by A. Mackenzie on South Boulder Creek, the only one I have seen. 



457. Sayornis saya — Say Phcebe. 



Common summer resident of plains, nesting more sparingly up to about 8,000 feet. 

 Have seen it at Boulder as late as September 15, in 1903. 

 459. Nuttallornis borealis — Olive-sided Flycatcher. 



Summer resident of mountains, passing over plains in migration. Gale found it 

 nesting at Ward, Gold Hill and Duck Lake, from 8,000 to 9,500 feet. 

 462. Myiochanes richardsonii — • Western Wood Pewee. 



Common summer resident of mountains, passing over plains in migration. Nests at 

 from 5,500 to 10,000 feet, according to Gale. 



