490 NORTH AMERICAN BIRDS. 
f?. Axillars and under wing-coverts pure white (tinged with 
buff in young); upper parts ash-gray, changing to 
yellowish olive-green on rump and upper tail-coverts ; 
lower parts chiefly white, the under tail-coverts and 
patch on chest (sometimes extended over throat) pure 
gamboge-yellow. 
Crown-patch (wanting in immature birds and some 
adult females) chestnut. Adult female with yellow 
of chest, etc., paler (and usually more restricted) 
than in male, and chestnut crown-patch usually 
less distinct (ometimes wanting). Young: Some- 
what like adult female, but browner, the lower 
parts tinged with buffy, the wing-coverts tipped 
with pale grayish buff, yellow of chest wanting, 
and no chestnut on crown. Length 4.75-5.00, 
wing about 2.30-2.50, tail 1.90-2.00. Hggs 61x 
AT, creamy white, finely and rather densely 
speckled round larger end with chestnut and 
purplish gray. Hab. Mountain districts of west- 
ern United States (except Pacific coast), north to 
Wyoming, Colorado, Utah, and Nevada; south 
through central Mexico to Guanajuato. 
644. H. virginie (Bairp). Virginia’s Warbler. 
ce. Upper tail-coverts chestnut (pale tawny in young); wing not more 
than 2.30. 
Adult (sexes alike): Above ash-gray, the rump and upper tail- 
coverts and patch on crown (except sometimes in female) 
chestnut; orbital ring and lower parts white or buffy white. 
Young: Essentially like adult, but no chestnut on crown, the 
rump and upper tail-coverts pale tawny, and wing-coverts tipped 
with buffy. Length 4.00-4.65, wing about 2.20-2.30, tail 1.70- 
1.90. West in holes or behind bark of trees, stumps, etc. Eggs 
3-4, .57 x .44, white or creamy white, finely speckled, usually 
in dense ring round larger end, with reddish brown. Hab. 
Valleys of lower Colorado and Gila Rivers, in Arizona and 
southeastern California, and south into Sonora. 
643. H. lucize (Coor.). Lucy’s Warbler. 
Genus COMPSOTHLYPIS Casanis. (Page 481, pl. CXVL,, fig. 3.) 
Species. 
Common CHaracters.—Above gray, bluish gray, or grayish blue, the back 
with a triangular patch of olive-green; wings usually with two white bands; inner 
webs of outer tail-feathers marked with a white spot (except sometimes in C. insu- 
