Range.--Pacific coast; breeds from southern California north to British Columbia; winters from southern California southward.

=721b. Western House Wren= (_T. a. aztecus_). Similar to No. 721, but much grayer above and paler below; back more frequently barred.

Color Key to North American Birds — Part 210

Range.--Western United States from the Sierra Nevada east to the Mississippi Valley; winters south into Lower California and Mexico.

Color Key to North American Birds — Part 210

=722. Winter Wren= (_Olbiorchilus hiemalis_). L. 4; T. 1.2. _Ads._ Above cinnamon, much brighter than in No. 721; below pale cinnamon, sides and belly heavily barred with blackish. _Notes._ Call, _chimp-chimp_, resembling call of Song Sparrow; song, tinkling, rippling, full of trills, runs and grace notes. (Bailey.)

Color Key to North American Birds — Part 210

Range.--Eastern North America; breeds from northern New England and northern New York northward, and southward along the Alleghanies to North Carolina; winters from Massachusetts and Illinois to Florida.

=722a. Western Winter Wren= (_O. h. pacificus_). Similar to No. 722, but much deeper colored both above and below, and more heavily barred.

Range.--Breeds on the Pacific coast from southern California north to Alaska; east to Idaho; winters south into Mexico.

=722b. Kadiak Winter Wren= (_O. h. helleri_). Slightly larger and paler than No. 722a. (Osgood.)

=723. Alaskan Wren= (_Olbiorchilus alascensis_). Resembling No. 722a, but paler and larger, W. 2.1, B. .6.

Range--Breeds on Kadiak Island, Alaska; winter range unknown.

=723.1. Aleutian Wren= (_Olbiorchilus meligerus_). Similar to No. 723, but darker, less reddish; rump and upper tail-coverts more evidently barred; bars on belly heavier. (Oberholser.)

Range.--"Westernmost part of the Aleutian group, Alaska." (Oberholser.)

=724. Short-billed Marsh Wren= (_Cistothorus stellaris_). L. 4; T. 1.4; B. .4. _Ads._ _Crown_ and back streaked with whitish; breast-band, sides and under tail-coverts rusty; wing-coverts tipped with whitish. _Notes._ Call, like sound produced by striking two pebbles together; song, _chap--chap--chap-chap_, _chap-chap-chap p-p-rrr_. (Seton.) (See next page.)

Range.--Eastern North America, ranging west to Utah; breeds from the Gulf States north to Massachusetts and Manitoba; winters from the Gulf States southward.