Dr. Cooper states that these birds appear at San Diego by the 20th of April, in small flocks migrating northward, and then uttering only a faint chirp. They frequent low bushes along the coast, but as they proceed farther north they take to the deciduous oaks as the leaves begin to expand, early in May, at which time they reach the Columbia River. He has never met with any in California after April. Mr. Ridgway observed this species only in the pine and cedar woods of the East Humboldt Mountains, where, in all probability, they were breeding. He observed numerous families of young birds following their parents in the months of July and August. He met with them only among the cedars and the woods of the nut-pine, and never among the brushwood of the cañons and ravines. He states that the common note of this bird greatly resembles the sharp chirp of the _Dendroica coronata_, and is louder and more distinct than that of _D. auduboni_. Mr. A. Boucard obtained specimens of these birds at Oaxaca, Mexico, during the winter months. Dendroica chrysopareia, SCL. & SALV. YELLOW-CHEEKED WARBLER. _Dendroica chrysopareia_, SCLATER & SALVIN, P. Z. S. 1860, 298.—IB. Ibis, 1860, 273 (Vera Paz, Guatemala).—IB. 1865.—DRESSER, Ibis, 1865, 477.—BAIRD, Rev. Am. B. 1864, 183.—COOPER, Orn. Cal. 1, 1870, 93. SP. CHAR. (229, Salvin collection.) Head and body above black, the feathers with olive-green edges, especially on the back, obscuring the ground-color; rump clear black. Entire side of head (extending to nostrils and on lower jaw), and the partially concealed bases of the feathers on the median line of the forehead, yellow, with a narrow black line from lores, through the eye, widening behind, but not crossing through the yellow. Beneath, including inside of wings, white; a large patch of black covering the chin and throat, and occupying the entire space between the yellow patches of the two sides of the head and neck, and extended along the sides in a series of streaks. Feathers of crissum with black centres. Wings above ashy, with two white bands across the coverts, the scapulars streaked with blackish; first quill edged externally with white, the rest with gray. Tail-feathers blackish, edged externally with ashy, the lateral with white at the base. Outer tail-feather white on the inner web, except a stripe along the shaft near the end; second similar, but the white not reaching so far towards the base; third with a short patch of white in the end. Bill and legs brownish-black. Bill unusually thick. Length, 4.50; wing, 2.50; tail, 2.40; tarsus, 2.75. HAB. Vera Paz, Guatemala; San Antonio, and Medina River, Texas. (HEERMANN and DRESSER.) The capture of specimens of this species at San Antonio, Texas, by Dr. Heermann, and on the Medina River by Mr. Dresser, entitles it to a place in our fauna. The specimen described above is Mr. Salvin’s type.