Dr. Cooper, in his paper on the fauna of Montana, mentions this Warbler as the only one of the genus seen by him between Fort Benton and Fort Vancouver. It was very common throughout the mountains, and he found it in every portion of the country west of them, even where scarcely a bush was to be seen. According to the careful observations of Mr. Robert Ridgway, this Warbler, during the summer months, in the Great Basin, chiefly inhabits the pines of the high mountain ranges, as well as the cedar and piñon woods of the desert mountains. In winter it descends to the lower portions, being then found among the willows, or, in small roving companies, hopping among the tree-tops in the river valleys. In manners it is said by him to resemble the _coronata_, but in their notes they differ very widely. A nest, containing three young, was found by Mr. Ridgway near the extremity of a horizontal branch of a pine-tree, about ten feet from the ground. The eggs of the Audubon Warbler do not resemble those of any _Dendroica_ with which I am acquainted, but are most like those of the Hooded Warbler. They measure .70 by .50 of an inch, have a reddish or pinkish white ground, and are sparingly marked with fine brown markings, tinted with a crimson shading. Dendroica maculosa, BAIRD. BLACK AND YELLOW WARBLER. _Motacilla maculosa_, GM. Syst. Nat. I, 1788, 984. _Sylvia m._ LATH.; VIEILL.; BON.; NUTT.; AUD. Orn. Biog. I, II, V, pl. 1. 123. _Sylvicola m._ SWAINS.; BON.; AUD. Birds Am. II, pl. xcvi. _Rhimanphus m._ CAB. Jour. III, 1855, 474 (Cuba). _Dendroica m._ BAIRD, Birds N. Am. 1858, 284; Review, 206.—SCLATER, P. Z. S. 1859, 363, 373 (Xalapa).—BRYANT, Pr. Bost. Soc. VII, 1859 (Bahamas).—SCLATER & SALVIN, Ibis, 1859, 11 (Guatemala).—LAWRENCE, Ann. N. Y. Lyc. 1861, 322 (Panama; winter).—GUNDLACH, Cab. Jour. 1861, 326 (Cuba; very rare).—SAMUELS, 238. _Sylvia magnolia_, WILS. III, pl. xxiii, fig. 3.