BIRDS OF BOULDER COUNTY, COLORADO 197 



10,000 feet (Cooke). Dille records two females with nests and eggs in June, 

 1903, from the same locality. 



Bubo virginianus pallescens, Western Horned Owl (375a) 



Permanent resident ; common in the Plains and Yellow Pine zones and occur- 

 ring in the higher mountains (from reports of residents) . Gale found eggs between 

 March 3 and 24. Kellogg and Widmann both report it from Estes Park. 



[Nyctea nyclea, Snowy Owl (376)] 



Very rare winter visitor (Henderson). It has been taken about twenty miles 

 north and south of the county and is considered a rare winter visitor to Colorado 

 by Sclater. 



Speotyto cunicularia hypogaea, Burrowing Owl (378) 



Summer resident; common on the Plains. Gale was informed of their pres- 

 ence as early as March 10; October 13 is the latest date noted by the writer. 

 There appear to be no definite winter records. Fresh eggs were found by Gale 

 on May 10 near Valmont (three nests running from 20 to 30 inches in depth below 

 the surface and having burrows about six feet long). He also found young just 

 hatched on June 10. 



Glaucidium gnoma pinicola, Rocky Mountain Pygmy Owl (379) 



Permanent resident; infrequent. Gale saw one on March 10, and had two 

 specimens taken December 13 and January 20 in the Yellow Pine zone (7,500 

 feet). There is one in the University collection taken near Boulder by Bragg. 

 The writer saw one in the Yellow Pine on July 4, and several in Boulder between 

 January 3 and February 14, 1912. Sclater records a nesting record by W. G. 

 Smith in Estes Park at 10,000 feet. 



Order COCCYGES, Cuckoos, Kingfishers, etc. 

 Suborder Cuculi, Cuckoos, etc. 



Family CUCULIDAE, The Cuckoos, Anis, etc. 

 Coccyzus americanus occidentalis, California Cuckoo (387a) 



Visitant ; rare in summer in the Plains zone. There is one specimen in the 

 University collection taken by Bragg in 1904. The writer has five records of 

 cuckoos for the county seen in July and August, 1910-12. Material is not avail- 

 able for determining the relative standing of the eastern and western forms of the 

 Yellow-billed Cuckoo in the county and all have been referred to the western 

 form on the basis of the specimen mentioned. 



