BIRDS OF BOULDER COUNTY, COLORADO 203 



Cyanocitta stelleri diademata, Long-crested Jay (4786) 



Permanent resident ; common in the Yellow Pine and lower part of the Moun- 

 tain zone. In winter it is also found in the cottonwoods and orchards of the 

 Plains. Gale found eggs from May 8 to May 29. 



Aphelocoma woodhousei, Woodhouse's Jay (480) 



Felger has one taken by Gale on the St. Vrain, October 31, 1887 (Henderson). 

 There is one in the University collection taken by Bragg in the foothills near 

 Boulder in 1904. This species is common in the southern part of the state. 



Perisoreus canadensis capitalis, Rocky Mountain Jay (4840) 



Permanent resident; common, chiefly confined to the Mountain zone at all 

 times. "Have seen a few in Boulder twice during severe winter weather" (Hen- 

 derson). Eggs have not been taken; Gale believed from observations on young 

 birds out of the nest that they should be found about the last of April. 



[Corvus corax sinuaius, Raven (486)] 



Pierce (Kellogg, 1889) reported this species as an occasional visitant at Estes 

 Park. Apparently rare on the eastern slope. 



Corvus cryploleucus, White-necked Raven (487) 



Noted at Boulder in 1894 by R. A. Campbell (Cooke). Listed by Gale as a 

 "summer visitant" without further data. Sclater states that they were appar- 

 ently abundant along the eastern foothills about forty years ago but are now 

 seldom, if ever, seen. 



Corvus brachyrhynchos hesperis, Western Crow (4886) 



Permanent resident; infrequent on the Plains. Gale recorded a few nests 

 with eggs between April 24 and May 2. The writer found half -grown young in 

 the nest, June 4. Blanchard and Markman reported a flock in the lower Yellow 

 Pine in December, 1906 (Henderson). 



Nucifraga columbiana, Clarke's Nutcracker (491) 



Permanent resident; common in the Mountain zone and at times in the 

 Yellow Pine — probably depending upon the seed crop in the western yellow pines. 

 Gale found two nests with three eggs each, one on March 7, 1888, and the other on 

 April 5, 1889, at elevations of about 9,000 and 9,500 feet. 



Cyanocephalus cyanocephalus, Pinyon Jay (492) 



Visitant; common in the Yellow Pine and occasionally found on the Plains 

 and in the Mountain zone (9,500 feet). They have been observed in every month 

 of the year (except December). The birds apparently remain in flocks at all times 

 and no indications that they nest in the county have as yet been found. Hender- 

 son found them in very large flocks near Lyons, October 1-4, 1908. 



