496 KORTH AMERICAN BIRDS. 



Adult male : Above dark dull blue, the back soiuelimea indis- 

 tinctly spotted witb black ; sides of head, chin, throat, 

 chest, sides of breast, and sides, uniform deep black ; rest 

 of lower parts white. (^In winter, upper parts tinged with 

 olive-green, the chin and throat varied, more or less, with 

 ■white, and white of flanks tinged with brownish.) Adult 

 female: Above plain dull olive or grayish green, sometimes 

 tinged with blue; lower parts (including the portions 

 which are black in the male) plain pale greenish buff. 

 Young : Above dull brown, the wings (except coverts) and 

 tail as in adults ; a dull yellowish white superciliary stripe; 

 below this, sides of head blackish in male, dull grajnsh 

 brown in female; lower parts j-cllowish white, more 

 brownish anteriorly. Length 4.70-5.50, wing 2.50-2.G5, 

 tail 2.05-2.25. JVest on bushes in open coniferous woods, 

 compact, composed of fine dry grasses, spiders' webs, lichens, 

 strips of fine bark, etc., the cavity 1.40 deep by 2.00 across. 

 Eggs usually 4, .08 X ••19) buffy whitish or greenish white, 

 more or less heavily spotted or blotched with reddish brown. 

 Mab. Eastern North America, breeding from northern New 

 England and New York northward, and southward along 

 higher Alleghanies; in winter, Florida, Bahamas, and 

 Greater Antilles ; accidental in California (Earallon Islands). 

 654. D. caerulescens (Gmel.). 

 Black-throated Blue Warbler. 

 d'. Outer surface of wings with more or less distinct lighter markings, 

 but without white spot at base of quills, 

 e". Rump yellow. 



'■'. Crown with a 3-ellow patch (partlj' concealed). 



gK Adult male: Lower parts, including chin and throat, 

 white, the chest and sides broadlj- streaked with 

 black (these streaks sometimes more or less con- 

 fluent, forming a broken patch), and the sides 

 of the breast with a yellow patch ; upper parts 

 bluish gi'ay, becoming blackish on sides of head, 

 which are marked by white supraloral and post- 

 ocular streaks ; back broadl}- streaked with black ; 

 wing with two white bands across tips of middle 

 and greater coverts. Adult female: Similar to 

 male, but much duller in color, with markings 

 less conspicuously contrasted. Winter plumage 

 {sexes essentially aUkc) : Upper jiarts strongly 

 washed with umber-brown, and lower parts more 

 or less suffusod with a ]>aler wash of the same — 

 the pattern of the summer iilumago being thereby 



