490 NORTH AMERICAN BIRDS. 



f. Axillars and under wing-covorts 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 (sometimes 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. Eggs .61 X 

 .47, 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 centt'al Mexico to Guanajuato. 

 644. H. virginiae (Baird). Virginia's Warbler. 

 cl 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. Nest 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. Sab. 

 Valleys of lower Colorado and Gila Elvers, in Arizona and 

 southeastern California, and south into Sonora. 



643. H. lucise (Coop.). Lucy's Warbler. 



Genus COMPSOTHLYPIS Cabanis. (Page 481, pi. 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- 



