Color Key to North American Birds — Part 179

=462a. Large-billed Wood Pewee= (_C. r. peninsulæ_). Similar to No. 462, but smaller, W. 3.3; the bill larger, length from nostril .42, width at nostril, .31; upperparts grayer. (Brewster.)

=466. Traill Flycatcher= (_Empidonax traillii_). Similar to No. 466a, but upperparts browner with little if any real greenish tinge; bill averaging narrower.

Range.--Western United States; breeds from western Texas and southern California north to Alaska and Great Slave Lake, east to Kansas, Missouri and Illinois; winters in the tropics.

=466a. Alder Flycatcher= (_E. t. alnorum_). L. 6.1; W. 2.8. _Ads._ Lower mandible horn color; below white, breast grayish; breast and sides faintly washed with yellow; above _brownish_ olive-green; wing-bars usually buffy. Like No. 467, but larger. _Notes._ _Pĕp_ of alarm, and an explosive _ēē-zēē-e-ûp_ with stress on the rasping _zēē_. (Dwight.)

Range.--Eastern United States, west to Michigan; breeds from northern New Jersey (locally) north to New Brunswick; winters in the tropics.

=467. Least Flycatcher= (_Empidonax minimus_). 5.4; W. 2.5. _Ads._ Similar in color to No. 466a, but smaller, tail slightly forked. _Yng._ Wing-bars more buffy. _Notes._ a vigorous _chebec_, _chebec_; rarely a flight song, "_chebec_, _tooral-ooral_."

Range.--Eastern North America, west to western Texas and eastern Colorado; breeds from Pennsylvania (North Carolina, in the Alleghanies) north to New Brunswick and Great Slave Lake; winters in Central America.

=468. Hammond Flycatcher= (_Empidonax hammondi_). L. 5.5. _Ads._ Bill smallest of our _Empidonaces, lower_ mandible _brown_; _throat_ and breast grayish, breast and belly slightly washed with sulphur; above grayish with a slight olive tint. Like No. 467, but bill smaller, lower mandible browner, throat grayer.

Range.--Western North America; breeds from the mountains of New Mexico, Arizona, and southern Athabasca, east to Colorado, winters in Mexico.

=469. Wright Flycatcher= (_Empidonax wrightii_). Similar to No. 468, but underparts whiter; bill much longer, longest and narrowest of our _Empidonaces_; lower mandible whitish at base, brownish at tip; outer web of outer tail-feather white.

Range.--Western United States, east to eastern slope of Rockies; breeds from mountains of New Mexico, Arizona, and southern California north to Montana and southern Oregon; winters in Mexico.