CHECK-LIST OF COLORADO BIRDS 323 



not quite sure that it breeds in the State ; has been taken 

 in summer at an altitude of 11,000 feet. 



360. American sparrow hawk. FALCO SPARVERIUS. 

 Abundant resident; the most common hawk from the 

 plains to 11 ,000 feet ; some "winter in State ; breeds 

 throughout its range. 



360a. Desert sparrow hawk. FALCO SPARVERIUS DESER- 

 TICOLUS. Resident, though rare ; taken in Middle and 

 South Parks. 



364. American osprey. PANDION HALIAETUS CAROLI- 

 NENSIS. Summer resident ; not uncommon locally ; breeds 

 as high as 9^000 feet ; has been taken in fall at an altitude 

 of 10,500 feet. 



365. American barn owl. STRIX PRATINCOLA. Resi- 

 dent ; quite rare ; a southern species rarely coming so far 

 north as Colorado. 



366. American long-eared owl. Asio WILSONIANUS. Com- 

 mon resident ; winters from plains to 1 0,000 feet ; breeds 

 from plains to 11,000 feet ; eggs laid early in April. 



367. Short-eared owl. Asio ACCIPITRINUS. Resident, 

 but not common ; highest record 9>500 feet. 



368. Barred owl. SYRNIUM NEBULOSUM. Resident; 

 few records ; one breeding pair found in the northeastern 

 part of the State. 



369. Spotted owl. SYRNIUM OCCIDENTALE. Resident; 

 not common ; a little doubt as to its identity ; but Mr. 

 Aiken vouches for its presence in the State. 



371. Richardson's owl. NYCTALA TENGMALMI RICHARD- 

 SONI. Rare winter visitor ; a northern species. 



372. Saw-whet owl. NYCTALA ACADICA. Resident ; not 

 uncommon ; occurs throughout the State below 8,000 feet. 



