336 BIRDS OF THE ROCKIES 



COLA. Summer resident; not uncommon locally; found 

 only in southwestern part of the State. 



574a. Sage sparrow. AMPHISPIZA BELLI NEVADENSIS. 

 Abundant summer resident ; common on sage-brush plains 

 of western and southwestern Colorado ; ranges as far east 

 as San Luis Park and north to Cheyenne, Wyoming. 



581. Song-sparrow. MELOSPIZA FASCIATA. Rare mi- 

 grant ; found only at eastern border of State. 



58 Ib. Mountain song-sparrow. MELOSPIZA FASCIATA 

 MONTANA. Common summer resident ; a few remain on 

 plains in mild winters ; breeds from plains to 8,000 feet. 



583. Lincoln's sparrow. MELOSPIZA LINCOLNI. Com- 

 mon summer resident ; abundant in migration ; breeds 

 from base of foothills to timber-line. 



584. Swamp sparrow. MELOSPIZA GEORGIANA. Acci- 

 dental summer visitor ; one record. 



585c. Slate-colored sparrow. PASSERELLA ILIACA SCHIS- 

 TACEA. Rare summer resident ; only three records. 



588. Arctic towhee. PIPILO MACULATUS ARCTICUS. Win- 

 ter resident ; not uncommon ; comes to base of Rocky 

 Mountains in winter ; breeds in the North, as far as the 

 Saskatchewan River. 



588a. Spurred towhee. PIPILO MACULATUS MEGALONYX. 

 Common summer resident ; upper limit, 9,000 feet. 



591. Canon towhee. PIPILO FUSCUS MESOLEUCUS. Resi- 

 dent ; common locally ; all records from Arkansas Valley ; 

 rare at an altitude of 10,000 feet. 



592. Abert's towhee. PIPILO ABERTI. Rare summer 

 resident ; species abundant in New Mexico and Arizona. 



592.1. Green-tailed towhee. OREOSPIZA CHLORURA, 

 Common summer resident ; melodious songster. 



