This species is of the size of the last but is blackish (darkest on the head and breast), with a white belly and under tail coverts, the latter streaked with dusky. Their habits and nesting habits are the same as those of the eastern Phœbe, they building their nests of mud, moss, weeds and feathers on ledges or about buildings, and generally close to or in the vicinity of water. They breed during April or May, laying four or five white eggs which cannot be distinguished from those of the common Phœbe. Size .75 x .55. 458a. WESTERN BLACK PHŒBE. _Sayornis nigricans semiatra._ Range.--Pacific Coast of Mexico and the United States, breeding north to Oregon. This variety differs from the last in having the under tail coverts pure white. Its nesting habits are precisely the same and the eggs indistinguishable. [Illustration 291: 457-458.] [Illustration: White.] [Illustration: White.] [Illustration: deco.] [Illustration: right hand margin.] Page 290 459. OLIVE-SIDED FLYCATCHER. _Nuttallornis borealis._ Range.--Whole of North America, breeding from the Middle States and California northward, and in the Rockies, south to Mexico; winters south of the United States. These Flycatchers are nowhere abundant, and in some parts of the country, especially in the middle portion, they are very rare. They breed very locally and generally not more than one pair in any locality. In New England, I have always found them nesting in company with Parula Warblers, in dead coniferous swamps in which the branches are covered with long pendant moss. Their nests are placed high up in the trees, generally above fifty feet from the ground, and on small horizontal limbs; they are made of small twigs and rootlets, lined with finer rootlets and moss, and are very flat and shallow; as they are generally made to match the surrounding, they are one of the most difficult nests to find. They lay three or four cream colored eggs which are spotted with reddish brown and lilac, chiefly about the large end. Size .85 x .65. Data.--Lake Quinsigamond, Massachusetts, June 12, 1897. Nest of twigs and moss, about 60 feet above the ground, in a dead pine tree in center of a large wet swamp. Nest could not be seen from the ground, and was found by watching the birds. [Illustration 292: Olive-sided Flycatcher.] [Illustration: Creamy white.] [Illustration.] [Illustration: left hand margin.] Page 291 460. COUES'S FLYCATCHER. _Myiochanes pertinax pallidiventris._ Range.--Western Mexico, breeding north to central Arizona.