326 



SYSTEMA TIC SYNOPSIS. — PASSERES— OSCINES. 



Fig. 181. — Black-poll Warbler, 

 nat. size. (Ad. nat. del. E. C.) 



which there can be no difficulty. Eastern N. Am. ; W. regularly to the Plains, casually to 

 Utah. Abundant in mixed woodland ; breeds in northerly parts of its U. S. range and north- 

 ward, also much further S. in the Alleghanies ; winters extralimital in the Bahamas, Mexico, 

 and Central and S. Am. One of the later migrants in spring. Nests in bushes and trees, 

 preferably evergreens, building a rather large and flattisb nest, about 5.00 broad outside and 

 2.00 deep, with a cavity of only about 2.00 X 1-00 ; eggs not peculiar, 0.70 X 0.50, greenish 

 or bluish-white, with the usual shades of brown and neutral tint in dots and spots, cliietly at 

 or near the larger end. 



D. stria'ta. (Lat. striata, striped. Fig. 181.) IJlack-poll Warbler. Adult ^ : Back, 

 rump, and upper tail-coverts grayish-olive, heavily streaked with black; whole crown pure 

 glossy black. Below, pure white ; a double series of black 

 sti-eaks starts from the extreme chin, and diverges to pass one 

 on each side to the tail, the streaks being continent anteriorly, 

 discrete posteriorly. Side of head above the chain of streaks 

 pure white, including lower eyelid. Wings dusky; primaries 

 with much greenish edging ; inner secondaries with whitish edg- 

 ing, greater and median coverts tipped with white, forming two 

 cross-bars. Tail like wings, with rather small white spots at 

 ends of inner webs of two or three outer feathers. Upper man- 

 dible brownish-black ; lower mandible and feet ilesh-colored or 

 yellowish. Length 5.25-5.75 ; extent 8.75-9.30 ; wing 2.70-2.90 ; tail 2.25. Adult 9 : En- 

 tire upper parts, including crown, greenish-olive, with dusky streaks; below, white, much 

 tinged with greenish -yellow, especially anteriorly, the streaks dusky and not so sharp as those 

 of (J, but still very evident. Bars and edgings of wings greenish-white. Tail as in ^. Rather 

 smaller than $ on an average. Young : Similar to adult 9 > l^'^t brighter and more greenish- 

 olive above, the streakings few and chiefly confined to middle of back ; below, more or less 

 completely tinged with greenish-yellow, the streakings obsolete, or entirely wanting. Under 

 tail-coverts usually pure white. These autumnal birds bear an extraordinary resemblance to 

 those of B. castanea (though the adults are so very difi"erent), the upper parts being, in fact, 

 the same in both. But young castanea generally shows traces of chestnut, or at least a buffy 

 shade, quite different from the clear greenish-olive of striata, this tint being strongest on flanks 

 and under tail-coverts, where striata is the most purely white. Moreover, castanea shows no 

 streaks below, traces at least of which are usually observable in striata. N. Am., excepting 

 Western and most of Middle Province ; N. to the Arctic Ocean, Greenland, Alaska ; W. to 

 Montana and Colorado. Winters extralimital, in S. 

 America. Breeds from northern New England and Mich- 

 igan and mountainous parts of New York. Migrates 

 late in spring, bringing up the rear-guard of the War- 

 bler hosts ; when the Black -polls appear in force the 

 collecting season is about over! Nests low in spruce- 

 trees and other evergreens and sometimes on the ground, 

 in high latitudes lined with feathers ; eggs 5, 0.72 X 

 0.50, not peculiar, being white with a creamy or buft' 

 tinge, very variably dotted, spotted, or blotched with 

 different shades of brown, gray, and blackish. 

 D. casta'nea. (Lat. castanea, a chestnut, in allusion 

 to the color. Fig. 182.) Bay-bueasted Warbler. 

 Adult $, in spring : Back thickly streaked with black 

 and grayish-olive ; forehead and sides of head black, enclosing a large deep chestnut patch ; a 

 duller chestnut (exactly like a Bluebird's breast) occupies the whole chin and throat and 



Fio. 182. 

 Fuertes.) 



•Bay-breasted Warbler. (L. A. 



