338 BIRDS OF THE ROCKIES 



61 2. Cliff-swallow. Petrochelidon lunifrons. Abun- 

 dant summei- resident ; breeds everywhere from plains ta 

 10,000 feet ; nests on cliffs and beneath eaves. 



613. Barn swallow^. Hirundo ervthrogaster. Com- 

 mon smnmer resident ; breeds from plains to 10,000 feet. 



614. Tree swallow. Tachycineta bicolor. Summer 

 resident ; not uncommon ; breeds occasionally on the 

 plains; more frequently in mountains up to 10,000 

 feet. 



615. Violet-green swallow. Tachycineta thalassina. 

 Summer resident ; abundant locally ; a few breed on 

 plains ; more commonly from 6,000 to 10,500 feet. 



616. Bank swallow. Clivicola riparia. Rare sum- 

 mer resident ; rarest Colorado swallow ; from plains to 

 foothills. 



617. Rough-w^inged swallow. Stelgidopteryx serri- 

 pennis. Summer resident ; not uncommon ; breeds below 

 7,500 feet. 



61 8. Bohemian waxwing. Ampelis garrulus. Winter 

 resident ; not uncommon ; breeds north of the United 

 States. 



619. Cedar waxwing. Ampelis cedrorum. Resident; 

 not common ; breeds from plains to about 9,000 feet. 



621. Northern shrike. Lanius borealis. Common win- 

 ter resident; on its return from the North in October it 

 first appears above timbei'-line, then descends to the 

 plains. 



622a. White-rumped shrike. Lanius i.udovicianus ex- 

 CUBITORIDES. Common summer resident ; breeds mostly 

 on the plains ; sometimes in mountains up to 9,500 

 feet. 



