CHECK-LIST OF COLORADO BIRDS 321 



mer visitor ; rare or accidental ; bird of the plains, not 

 regularly west of central Kansas. 



S'iO. Mississippi kite. Ictinia mississippiexsis. Acci- 

 dental ; two records ; a bird of eastern and southern 

 United States, and southward. 



331. Marsh hawk. Circus hudsoxils. Common resi- 

 dent ; most common in migration ; a few remain through- 

 out winter ; breeds on plains, and in mountains to 10,000 

 feet ; in fall may be seen at 14,000 feet. 



332. Sharp-shinned hawk. Accipiter velox. Com- 

 mon resident ; much more common in mountains than 

 on plains ; breeds uj) to 10,000 feet. 



333. Cooper's havyk. Accipiter cooperi. Common 

 resident ; breeds from ])lains to 9,000 feet. 



SSi. American goshawk. Accipiter atricapillus. 

 Resident ; not uncommon ; breeds from 9,000 to 10,000 

 feet ; more common in winter than summer. 



33ia.. Western goshaw^k. Accipiter atricapillus 

 STRiATULus. Winter visitor ; rare, if not accidental ; 

 Pacific Coast form ; comes regularly as far east as 

 Idaho. 



337a. Krider's hawk. Buteo borealis kriderii. Resi- 

 dent ; not uncommon ; nests on the jilains ; no certain 

 record for the mountains. 



337b. Western red-tail. Buteo borealis calurus. 

 Abundant resident ; this is the Rocky Mountain form, 

 of w'hich Krider's hawk is the eastern analogue ; the 

 ranges of the two forms overlap on the Colorado plains ; 

 calurus breeds from plains to 12,000 feet ; not a few 

 winter in the State. 



337d. Harlan's hawk. Buteo borealis harlani. Rare 



