_Certhia pinus_, LINN. Syst. Nat. I, 1766, 187. _Sylvia pinus_, LATH., VIEILL. (not of WILSON). _Helminthophaga pinus_, BAIRD, Birds N. Am. 1858, 254; Rev. 174.—SCLATER & SALVIN, Ibis, 1, 1859, 11 (Guatemala).—SCLATER, Catal. 1861, 28, no. 176. _Sylvia solitaria_, WILSON, Am. Orn. II, pl. xv.—AUD. Orn. Biog. I, pl. xx. _Sylvicola sol._ RICH. _Vermivora sol._ SW. _Helinaia sol._ AUD. Birds Am. II, pl. cxi. _Helmitherus sol._ BON.—SCLATER, P. Z. S. 1856, 291 (Cordova). _Helminthophaga sol._ CAB. SP. CHAR. Upper parts and cheeks olive-green, brightest on the rump; the wings, tail, and upper tail-coverts, in part, bluish-gray. An intensely black patch from the blue-black bill to the eye, continued a short distance behind it. Crown, except behind, and the under parts generally, rich orange-yellow. The inner wing and under tail-coverts white. Eyelids, and a short line above and behind the eye, brighter yellow. Wing with two white bands. Two outer tail-feathers with most of the inner web, third one with a spot at the end, white. _Female_ and _young_ similar, duller, with more olivaceous on the crown. Length, 4.50; wing, 2.40; tail, 2.10. HAB. Eastern United States and Mexico to Guatemala (Cordova; Coban). Not noted from West Indies. HABITS. The Blue-winged Yellow Warbler is not known so far to the north as New England, and is rare even in Eastern and Southern New York. It seems to be distributed through the United States from Pennsylvania to Florida, and from the Mississippi Valley eastward. It has also been taken in Central America. Mr. Trippe states that it breeds in the vicinity of Orange, N. Y. Mr. Audubon found it abundant in the barrens of Kentucky, and as far north on the Mississippi as St. Genevieve. In regard to the song of this bird, Mr. Trippe states that its notes are very forcible and characteristic. Once heard, they will always be remembered. He describes them as a rapid chirrup resembling _chūūchich, k´-a-re-r´r´r´r´r_, uttered very quickly. According to Mr. Ridgway, they are wonderfully similar to the rude lisping chirrup of the _Coturniculus passerinus_.