Tyrannula richardsoni, Swainson, F. Bor.-Am. II, 1831, 146, plate. Muscicapa richardsoni, Aud. Orn. Biog. V, 1839, 299, pl. ccccxxxiv. Tyrannula phœbe, Bon. List, 1838, 24. Muscicapa phœbe, Audubon, Synopsis, 1839, 42.—Ib. Birds Am. I, 1840, 219, pl. lxi (not of Latham). Tyrannus phœbe, Nuttall, Man. I, (2d ed.,) 1840, 319. Tyrannus atriceps, D’Orbigny (fide G. R. Gray). Contopus richardsoni, Baird, Birds N. Am. 1858, 189.—Sclater, Catal. 1862, 231.—Cooper, Orn. Cal. 1, 1870, 325. Contopus sordidulus, Sclater, Catal. 1862, 231. Contopus plebeius, (Caban.) Sclater, Cat. 1862, 231. Contopus bogotensis, (Bonap.) Sclater, P. Z. S. 1858, 459. (Tyrannula b. Bonap. Comp. Rend. p. 196.)
Sp. Char. General appearance of C. virens. Bill broad. Wings very long and much pointed, considerably exceeding the tail; second quill longest; third a little shorter; first shorter than fourth, and about midway between distance from second to fifth (.60 of an inch). Primaries 1.20 inches longer than secondaries. Tail moderately forked. Above dark olive-brown (the head darker); the entire breast and sides of head, neck, and body of a paler shade of the same, tingeing strongly also the dull whitish throat and chin. Abdomen and under tail-coverts dirty pale-yellowish. Quills and tail dark blackish-brown; the secondaries narrowly, the tertials more broadly edged with whitish. Two quite indistinct bands of brownish-white across the wings. Lower mandible yellow; the tip brown. Length, 6.20; wing, 3.65; tail, 3.10.
Hab. High central dry plains to the Pacific; Rio Grande Valley, southward to Mexico; Labrador (Audubon). Localities: Orizaba, Guatemala, Coban (Scl. Catal. 1862, 231); Costa Rica (Lawr. IX, 115); Matamoras, Texas (Dresser, Ibis, 1865, 474, breeds); San Antonio, Texas (Dresser, one spec.); W. Arizona (Coues, P. A. N. S. 1866, 61).
This species has a very close relationship to C. virens, agreeing with it in general shape of wings and in color. The wings are, however, still longer and more pointed; the primaries exceeding the secondaries by nearly 1.25 inches. The proportions of the quills are nearly the same in both; the primaries, too, are similarly a little emarginated or attenuated towards the end. The tail is rather more deeply forked, the feathers broader. The bills are similar; the feet are larger and stouter.
The general colors are almost precisely the same. The outer primary, however, lacks the decidedly white margin. The under parts are much darker anteriorly, the entire breast being nearly a uniform olive-brown, but little paler than the back; the throat, too, in some specimens, being scarcely paler. There is little or none of the pale sulphur-yellow of C. virens on the abdomen, and the under wing-coverts and axillaries are much darker olivaceous. In C. virens the middle line of the breast is always paler than the sides, or at least the connecting space is short.
The lower mandible is generally yellow; in a few specimens, however, it is quite dusky, especially on its terminal half.
The young bird has the darker head and broader light edgings, with the ferruginous tinge on the wing-markings, usually seen in young of the Tyrannulas.
A large series shows considerable variations; autumnal specimens have a more appreciable tinge of yellow on the lower parts, while summer individuals are more grayish.
Habits. This species was first obtained by Richardson in the Arctic regions, and described by Swainson. It was found in the neighborhood of the Cumberland House, where it frequented moist shady woods by the banks of rivers and lakes. It was supposed likely to travel in summer as far as the shores of the Great Slave Lake.
Since its discovery by Richardson, this Flycatcher has been found to have a widely extended geographical range, as far to the south as Guatemala, and even Panama, and northward as far as the 60th parallel of latitude, and from the great plains to the Pacific.