THE BIRDS OF BOULDER COUNTY 23 1 



387a. Coccyzus americanus occidentalis — California Cuckoo. 



One specimen collected by Bragg in 1904 is in the University cabinets. 



390. Ceryle alcyon — Belted Kingfisher. 



Summer resident of mountains and plains, formerly common, now not very common. 

 In 1903-4 two remained along Boulder Creek all winter within the city limits of Boulder. 



393c. Dryobates villosus monticola — Rocky Mountain Hairy Woodpecker. 



Common resident in mountains. Have seen it in Boulder only in winter. This county 

 is the type locality. Thirteen sets of eggs taken by Gale now in University cabinets were 

 found at from 7,500 to 10,000 feet, the eggs numbering 4, 5 and 6 to the set. Three were 

 from old pine stubs, the others from aspens from 2 to 25 feet from the ground. 



3946. Dryobates pubescens homorus — Batchelder Woodpecker. 

 Resident of mountains. Have seen it in Boulder only in winter. 



4016. Picoides americanus dorsalis — Alpine Three-toed Woodpecker. 



Probably resident of mountains. Felger reported it in summer of 1903 and A. 

 MacKenzie collected one on South Boulder Creek. 



402a. Sphyrapicus varius nuchalis — Red-naped Sapsucker. 



Common summer resident from foothills to timberline. Gale collection in University 

 contains 45 sets of eggs, nearly all from live aspens, mostly taken at from 7,500 to 9,000 

 feet, all taken in June. The eggs vary greatly in size, many of the sets containing some 

 eggs much smaller than the average. 



404. Sphyrapicus thyroideus — Williamson Sapsucker. 



Common summer resident from plains to timberline. In Gale collection are 57 sets 

 of eggs, mostly taken at from 7,500 to 9,500 feet, from May 26 to June 27, in partly decayed 

 aspen and conifer stumps. 



406. Melanerpes erythrocephalus — Red-headed Woodpecker. 



Common summer resident of mountains and plains, arriving late in May. Have seen 

 them flocking with Lewis woodpeckers at 7,000 feet on September 1, as if preparing for 

 migration. My latest autumn record at Boulder is October 23, 1904. 



408. Asyndesmus lewisi — Lewis Woodpecker. 



Common summer resident of lower mountain region, some remaining through the 

 winter. Gale's two nests were taken at 5,800 and 6,000 feet, respectively, in June. On 

 migration see preceding species. 



413. Colaptes cafer collaris — Red-shafted Flicker. 



Resident on plains and summer resident up to timberline, nesting at least up to Gold 

 Hill. Gale says winter resident of mountains also. Our most abundant woodpecker. 

 Have not seen C. auratus luteus here, but a specimen taken by Bragg near Boulder, now 

 in the University cabinets, appears to be hybrid, C. collaris X C. luteus, probably the form 

 which has been described as C. hybridus. Tripp (per Coues, Birds oj the Northwest, p. 295) 

 says: "Mrs. Maxwell, of Boulder, informs me that a yellow-winged flicker has appeared 

 in the groves that fringe the streams near that town within the last few years, and is gradu- 

 ally becoming more abundant. From her description I should suppose it to be C. auratus 

 but probably it is some form of C. hybridus." 



