444. Kingbird. Tyrannus tyrannus. Common summer resident; occurs only on plains and in foothills up to 6,000 feet; same form as the eastern kingbird.
447. Arkansas kingbird. Tyrannus verticalis. Common summer resident; more common in eastern than western part of the State; fond of the plains and foothills, yet breeds as high as 8,000 feet.
448. Cassin's kingbird. Tyrannus vociferans. Common summer resident; breeds on plains and up to 9,000 feet in mountains; occurs throughout the State.
454. Ash-throated flycatcher. Myiarchus cinerascens. Rare summer resident; western species, coming east to western edge of plains.
455a. Olivaceous flycatcher. Myiarchus lawrencei olivascens. Summer visitor, rare, if not accidental; a southern species; taken once in Colorado.
456. Phœbe. Sayornis phœbe. Rare summer visitor; comes west to eastern border of the State.
457. Say's phœbe. Sayornis saya. Common summer resident; most common on the plains; occurs on both sides of the range; the author found it a little above Malta, at Glenwood, and in South Park.
459. Olive-sided flycatcher. Contopus borealis. Common summer resident; breeds only in the mountains, from 7,000 to 12,000 feet.
462. Western wood pewee. Contopus richardsonii. Common summer resident; most common in breeding season from 7,000 to 11,000 feet.
464. Western flycatcher. Empidonax difficilis. Common summer resident; breeds from plains to 10,000 feet, but most common in upper part of its range.