_b._ Lower parts white, the breast rufous. One broad and distinct, and a narrower, more obsolete white band on the wing. 2. C. amœna. Head and neck, all round, and rump, bright greenish-blue; back, wings, and tail more dusky; a narrow white collar between rufous of the breast and blue of the throat. _Female_ grayish-brown above, the rump tinged with blue. Beneath dull whitish, the breast and jugulum more buffy. _Hab._ Western Province of United States. B. Head party-colored; eyelids different from adjoining portions. Commissure hardly appreciably sinuated, or even concave. _a._ Back and breast similar in color. Upper mandible much less deep than lower, the commissure concave. 3. C. versicolor. Back and breast dark wine-purple, occiput and throat claret-red, forehead and rump purplish-blue. Eyelids purplish-red. _Female_ fulvous-gray above, uniform pale fulvous below. _Hab._ Northern Mexico, and adjacent borders of United States; Cape St. Lucas. _b._ Back and breast very different in color. Upper mandible scarcely less deep than the lower, the commissure straight, or slightly sinuated. 4. C. ciris. Lower parts vermilion-red. Back green, crown blue; rump dull red; eyelids red. _Female_ dull green above, light olivaceous-yellow below. _Hab._ Gulf States of United States, and whole of Middle America. 5. C. leclancheri.[11] Lower parts gamboge-yellow. Back blue, crown green, rump blue; eyelids yellow. _Female_ not seen. _Hab._ Southern Mexico. [11] _Cyanospiza leclancheri. Spiza leclancheri_, LAFR. Mag. Zoöl. 1841, pl. xxii.—LESS. R. Z. 1842, 74. Cyanospiza cyanea, BAIRD. INDIGO BIRD. _Tanagra cyanea_, LINN. Syst. Nat. I, 1766, 315. _Emberiza cyanea_, GM. Syst. Nat. I, 1788, 876. _Fringilla cyanea_, WILSON, I, 1810, 100, pl. vi, f. 5.—AUD. Orn. Biog. I, 1832, 377; V, 503, pl. lxxiv. _Passerina cyanea_, VIEILL. Dict. _Spiza cyanea_, BON. List, 1838.—IB. Consp. 1850, 474.—AUD. Syn. 1839, 109.—IB. Birds Am. III, 1841, 96, pl. clxx. _Cyanospiza cyanea_, BAIRD, Birds N. Am. 1858, 505.—SAMUELS, 330. _? Emberiza cyanella_, GM. I, 1788, 887. _? Emberiza cærulea_, GM. Syst. Nat. I, 1788, 876. _Indigo Bunting_, and _Blue Bunting_, PENNANT and LATHAM. SP. CHAR. _Male._ Blue, tinged with ultramarine on the head, throat, and middle of breast; elsewhere with verdigris-green. Lores and anterior angle of chin velvet-black. Wing-feathers brown, edged externally with dull bluish-brown. _Female._ Brown above; whitish, obscurely streaked or blotched with brownish-yellow, beneath; tinged with blue on shoulders, edges of larger feathers, and on rump. Immature males similar, variously blotched with blue. Very young birds streaked beneath. Length, about 5.75 inches; wing, nearly 3.00.