_Pipilo mesoleucus_, BAIRD, Pr. A. N. Sc. Ph. VII, June, 1854, 119 (Rocky Mountains).—IB. Birds N. Am. 1858, 518; pl. xxix.—KENNERLY, P. R. R. X, b. pl. xxix.—HEERM. X, c. p. 15.—COOPER, Orn. Cal. 1, 247. _? Pipilo fusca_, “SWAINS.,” SCLATER & SALVIN, P. Z. S. 1869, 361 (city of Mexico). SP. CHAR. Above very dull olivaceous-brown, with a grayish tinge; hood dull chestnut, conspicuously different from the back. Sides like the back, but paler; posteriorly, and about the vent and under tail-coverts, pale brownish-red. The ashy olive-brown of the sides scarcely meeting across the breast, the lower portion of which, with the upper belly, is rather pure white. The loral region, chin, throat, and upper part of the breast, pale yellowish-rufous, finely spotted on the sides and more coarsely across the breast with brown; an obscure spot in the middle of the breast; edge of outer primary white. Bill pale brown; legs flesh-color; first quill about equal to eighth, third and fourth longest. Length, 8.50 inches; wing, 3.80; tail, 4.70. HAB. Valley of Upper Rio Grande and across to the Gila River. East to Santa Caterina, New Leon. This race is similar in general appearance to _P. crissalis_, but the olive-brown and rufous are both of a lighter shade. The crown is of a decided rufous, conspicuously different from the back, instead of nearly the same tint. The light reddish under the head is wider throughout, and extends down to the upper part of the breast, blending with the colors of the breast and belly, instead of being narrower, more sharply defined, and restricted to the chin and throat; it is palest anteriorly, the chin and lore being almost white. The isolated larger spot on the breast is more conspicuous; the breast and belly are quite pure white, shaded with obsolete brownish blotches, instead of being uniform grayish-brown, with only an approach to whitish in the very middle. The edges of the wing and tail feathers are a good deal lighter, the outer web of the first primary being sharply edged with pure white, instead of obscure grayish-brown. The size generally is rather smaller, the wings more pointed. Compared with _P. fuscus_, we find the tail decidedly longer; the wing more pointed; the first quill about equal to the eighth, instead of shorter than the secondaries. The colors generally are paler; the cap of head bright distinct rufous in strong contrast with the other plumage, instead of being only very obscurely tinged with that color. The white of belly is purer, and extends farther forward, displacing the ashy tinge almost to the buff of the throat.