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 summer resident; rarest Colorado swallow; from plains to foothills.
617. Rough-winged swallow. Stelgidopteryx serripennis. Summer resident; not uncommon; breeds below 7,500 feet.
618. 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 winter resident; on its return from the North in October it first appears above timber-line, then descends to the plains.
622a. White-rumped shrike. Lanius ludovicianus excubitorides. Common summer resident; breeds mostly on the plains; sometimes in mountains up to 9,500 feet.
624. Red-eyed vireo. Vireo olivaceus. Rare summer resident; an eastern species, coming only to base of foothills; still, one was taken at 11,000 feet.
627. Warbling vireo. Vireo gilvus. Common summer resident; breeds sparingly on the plains; commonly in mountains up to 10,000.
629a. Cassin's vireo. Vireo solitarius cassinii. Rare or accidental summer visitor; not known to breed; a southwestern species.