SP. CHAR. Bill lead-color. Head all round, and under parts generally, bright yellow; rest of upper parts yellow-olivaceous, brightest on the rump. Back with obsolete streaks of dusky reddish-brown. Fore breast and sides of the body streaked with brownish-red. Tail-feathers bright yellow; the outer webs and tips, with the whole upper surfaces of the innermost one, brown; extreme outer edges of wing and tail-feathers olivaceous like the back; the middle and greater coverts and tertials edged with yellow, forming two bands on the wings. _Female_ similar, with the crown olivaceous like the back, and the streaks wanting on the back, and much restricted on the under parts. Tail with more brown. Length of male, 5.25; wing, 2.66; tail. 2.25. (No. 940.) _Young._ Dull brownish-olive above; pale ochraceous-yellow beneath, with the throat more whitish; the yellow of tail restricted to inner half of inner webs. The latter feature will serve to distinguish it from any other North American species. HAB. Entire North America, and in winter into South America as far as Ecuador, Cayenne, and Trinidad. Not recorded from West Indies, where replaced by allied species. In the great abundance of this species and its wide range of distribution, there are many variations in size and color, though none that are not readily understood. In young birds the yellow of the tail-feathers is more restricted, sometimes confined to the edge of the inner webs. In adults there is occasionally a tinge of orange in the forehead. _Sylvia rathbonia_ of Audubon is described with even tail, and the tail-feathers brown, edged externally with yellow; the reverse of _æstiva_. It is generally, however, considered a synonyme. Birds of this type (“Golden Warblers”) of six or eight additional species are known to occur in the West Indies, the Galapagos, and in Middle America; one of them, _D. bryanti_, possibly to be met with in Southern Arizona. (See Baird, Review Am. Birds, 193.)