The eggs vary somewhat in their ground color, but exhibit only slight variations in size or shape. Their greatest length is 1.13 inches, and their average 1.12 inches. Their mean breadth is .77 inch, and their maximum .79 inch. The ground color is a greenish-white, profusely marked with spots of mingled purple and brown. In others the ground color is a bluish-green. In some specimens the spots are of a yellowish-brown, and in some the markings are much lighter. Harporhynchus curvirostris, CABAN. GRAY CURVE-BILL THRASHER. _Orpheus curvirostris_, SWAINSON, Philos. Mag. 1827, 369 (Eastern Mexico).—M’CALL, Pr. A. N. Sc. May, 1848, 63. _Mimus curvirostris_, GRAY, Genera, 1844-49. _Toxostoma curvirostris_, BONAP. Conspectus, 1850, 277.—SCLATER, P. Z. S. 1857, 212. _Harporhynchus curvirostris_, CAB. Mus. Hein. I. 1850, 81.—BAIRD, Birds N. Am. 1858, 351, pl. li.; IB. Rev. 45.—HEERMANN, P. R. R. Rep. X, Parke’s Rep. 1859, 11.—SCLATER, P. Z. S. 1859, 339; IB. Catal. 1861, 7, no. 46.—DRESSER, Ibis, 1865, 483. _Pomatorhinus turdinus_, TEMM. Pl. Col. 441. _? Toxostoma vetula_, WAGLER, Isis, 1831, 528. SP. CHAR. Exposed portion of the bill about as long as the head; considerably decurved. Above uniform grayish-brown, or light ash; beneath dull white; the anal region and under tail-coverts tinged with brownish-yellow. The under parts generally, except the chin, throat, middle of the belly, and under coverts, with rounded sub-triangular, quite well-defined spots, much like the back. These are quite confluent on the breast. Two narrow bands on the wing-coverts, and the edges of primaries and alulæ, are white. The tail-feathers, except the middle, are conspicuously tipped with white. Length of female, 10 inches; wing, 4.00; tail, 4.55; tarsus, 1.20. HAB. Adjacent regions of United States and Mexico, southward. Cordova, Orizaba, Mirador; Mazatlan, Colima, Oaxaca. Specimens from the Rio Grande across to Mazatlan represent one species; but those from the latter locality are somewhat darker in colors, though this may be owing, in part, to the fact that they are winter birds. Considerable differences in proportions may often be noticed between individuals, but nothing strikingly characteristic of any particular region. The specimens of the Mazatlan series (37,326 ♂, 51,523, and 51,525 ♂) have tails considerably longer than any of those from the Rio Grande, the excess amounting in the longest to nearly an inch; but one from the same locality has it _shorter_ than any of the Texas specimens. In its perfect plumage, this species has both rows of coverts distinctly tipped with white; but in the faded condition of midsummer, the bands thus produced are hardly discernible, and the spots below become very obsolete.