SYLVICOLID^E — THE WARBLERS. 245 



Its true song, heard only in spring, consists of two or three loud sweet whis- 

 tles, sometimes slurred, followed by several continuous notes, resembling 

 chir-r-r, in a wiry but clear tone. Their notes are of great power I'or the 

 size of the bird. It also has another and quite different song, which Dr. 

 Coues thought greatly resembled the notes of the connnon American Red- 

 start. 



As all the birds he noticed had mated by the first of May, he has no doul^t 

 that they raise two broods in a season; and the fact that he found newly 

 fledged young as late as the middle of August seems to corroborate the cor- 

 rectness of his supposition. In regard to the eggs, nest, or breeding-habits 

 of this species, we have as yet no information. 



Dendroica pennsylvanica, Baird. 



CHESTNUT-SIDED WARBLER. 



Motadlla pennsylvanica, Linn. Syst. Nat. L 1766, 333, no. 19 ; Gmelin. Sylvia p. Lath. ; 

 Wilson, \, pi. xiv, fig. 5. Dendroica p. Baird, Birds N. Am. 1858, 279 ; Rev. 191. 

 — SCLATER& Salvin, Ibis, 1859, 11 ; 1860, 273 (Coban, Guat. ; November). — Samu- 

 els, 231. Sylvia icteroceplmla. Lath. Ind. Orn. H, 1790, 538. — Vieill. ; Bon. ; 

 AuD. Orn. Biog. \, pi. lix. Sylvicola ict. Swains. ; Jard. ; AuD. Birds Am. II, ]il. 

 Ixxxi. Dendroica ict. Sclater, P. Z. S. 1859, 363 (Xalapa), 373 (Oaxaca). 



Other localities : Bahamas, Bryant, Pr. Bost. Soc. VII, 1859. Costa Rica, Cab. Jour. 

 1860, 328. Panama, winter, Lawr, Ann. N. Y. Lye. 1861, 322. Yiicataoi, Lawr. 

 Vcragua, Salv. 



Sp. Char. Male. Upper parts streaked with black and pale bluish-gray, which becomes 

 nearly white on the forepart of the back ; the middle of the back glossed with greenish- 

 yellow. The crown is continuous yellow, bordered by a frontal and superciliary 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 pur- 

 plish-chestnut stripe starting on each side in a line with the black mustache, and ex- 

 tending back to the thiglis. 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 mustache scarcely appreciable. Length, .5.00; wing, 2.50; tail, 2.20. 



Hai3. Eastern Province of the United States ; Bahamas ; Guatamela to Costa Rica 

 and Panama R. R. Not recorded from Mexico proper or West Indies, except Bahamas. 



The young in autumn is very different from either male or female in 

 .spring. Tlie entire u])]»er 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 tingeing the white of the chin and throat. No black 

 streaks are visible above or on the cheeks, and the eye is surrounded by a 

 continuous ring of white not seen in spring. In this plumage it has fre- 

 quently been considered as a distinct species. 



The male in this plumage may usually be distinguished from the female 



