THE BIRDS OF BOULDER COUNTY 229 



316. Zenaidura macroura carolinensis — Mourning Dove. 



Abundant summer resident from the plains to 8,000 feet, less common to 10,000 feet. 

 Arrives in March or April and a few remain late in the fall. 

 325. Cathartes aura septentrionalis — Vulture. 



No longer common in most of the county. One taken near Boulder three years ago 

 in University Museum. Gale noted them near Lyons in 1888 and found them nesting in 

 same trees with great blue herons. Markman records them at same place in June, 1907, 

 and on October 2, 1908, I saw several. 



331. Circus hudsonius — Marsh Hawk. 



Common summer resident of plains and mountains; less common in winter on plains, 

 with no winter mountain records. 



332. Accipiter velox — Sharp-shinned Hawk. 

 Resident of valley and mountains. 



333. Accipiter cooperii — Cooper Hawk. 



Common resident of plains and mountains. Gale found it nesting near head of 

 Left Hand Creek. 



334. Astur atricapillus — American Goshawk. 



Have seen but two, both killed in 1908, one of which is in University Museum. 

 Reported also by Sprague in his notes many years ago. H. G. Smith says he saw one in 

 a taxidermist's workshop, which was killed at Sugar Loaf, February 21, 1888. 

 337&. Buteo borealis calurus — Western Red-tail. 



Common summer resident of plains and mountains, less common in winter. 

 342. Buteo swainsoni — Swainson Hawk. 



Common resident of plains, less common in mountains. Gale took several sets of 

 eggs. 



348. Archibuteo ferrugineus — Ferruginous Rough-leg. 



Noted in Gale's Boulder County list as wintering on plains. One from near Boulder 

 in University collection. 



349. Aquila chrysaetos — Golden Eagle. 

 Resident, not common. 



352. Haliaeetus leucocephalus — Bald Eagle. 



I have seen but one and one reported by Blanchard. 



355. Falco mexicanus — Prairie Falcon. 



One reported by Blanchard, and Gale twice found it nesting on the St. Vrain. 



356a. Falco peregrinus anatum — Duck Hawk. 



One taken by Harry Holland, September n, 1898, labeled Longmont, is in cabinets 

 at State Capitol. Another in same collection, taken by B. Hayward, labeled Longmont, 

 may be from Calkins Lake. Gale found it nesting just north of the county line. 



357Z). Falco columbarius richardsoni — Richardson Merlin. 



One taken near Silver Lake, 10,000 feet, in September. Winters on plains and in 

 mountains, according to Gale, who took one near Boulder, January 5, 1885, now in 

 Felger's cabinets. 



