BIKDS SYLVICOLIDAE — DENDEOICA PEKNSYLVANICA. 



279 



DENDROIOA PENNSYLVANICA, Baird. 



Chestnnt-sided warbler. 



Motacilla pennaylvanica, Linnaeus, Syst. Nat. I, 1766, 333, No. 19.— Gmelin, Syst. Nat. I, 1788, 971, No. 19. 

 Sylvia pennsylvanica, Latham, Ind. Orn. II, 1790, 540. — Wilson, Am. Orn, I, 1808, 99 ; pi. xiv, f . 5. 

 •Motacilla icterocephala, Linnaeus, Syst. Nat. I, 1766, 334, 95. — Gmelin, Syst. I, 1788, 980. 

 Sylvia icterocephala, Ii^thilk, Ind. Orn. II, 1790, 538. — ^Vieillot, Oia. Am. Sept. II, 1807,31; pi. xc — Bon. 



Obs. Wils. 1826, No. 140.— Aud. Orn. Biog. I, 1832, 306 ; pi. 59.— Nuttall, Man. I, 1832, 



380. 

 Sylvicola icterocephala, "Swainson," Jard. ed. Wilson, 1832. — Rich. List. 1837.— 'Bonap. List. 1838. — Ib. 



Conspectus, 1850, 308.— Aud. Syn. 1839, 54.— Ib. Birds Am. II, 1841, 35 ; pi. 81. 



Sp. Ch. — Male. — Upper parts streaked with black and pale bluish gray, which becomes nearly white on the fore part of the 

 back ; the middle of the back glossed with greenish yellow. The crown is continuous yellow, bordered by a frontal and super- 

 ciliary band, and behind by a square spot of white. Loral region black, sending off a line over the eye, and another below it. 

 Ear coverts and lower eyelid and entire under, parts pure white, a purplish chestnut stripe starting on each side in a line with 

 the black moustache and extending back to the thighs. Wing and tail feathers dark brown, edged with bluish gray, except 

 the secondaries and tertials, which are bordered with light yellowish green. The shoulders with two greenish white bands. 

 Three outer tail feathers with white patches near the end of the inner webs. 



Female like the male, except that the upper parts are yellowish green, streaked with black ; the black moustache scarcely 

 appreciable. 



Length, 5 ; wing, 2.50 -, tail, 2.20. 



Hah. — Eastern United States to the Missouri. 



The greenisli white of the wing is rather in one band in the male than in two, the greater 

 coverts being edged as well as tipped with this color. 



The male (possibly of the first year) in autumn is very different from either male or female 

 in spring. The entire upper parts are of a continuous light olive green ; the under parts 

 white ; the sides of the head, neck, and breast ash gray, shading insensibly into and tinging 

 the white of the chin and throat. No black streaks are visible above nor on the cheeks, and 

 the eye is surrounded by a continuous ring of white, not seen in spring. The wings and tail 

 are much as in the female. 



In one specimen from St. Louis (6977) the black completely encircles the eye, and the bill is 

 entirely bluish black, instead of being brown beneath. 



List of specimens. 



