SP. CHAR. Prevailing color above olive-green; the head and neck all round black, abruptly contrasted below with the white under parts; above passing insensibly into the green of the back; feathers of interscapular region obscurely dusky medially; sides and crissum rufous. Scapulars and greater and middle coverts with outer webs pale greenish-yellow at ends; these blotches faintly margined externally with olive-green. Edge of wing yellow; outer primary edged with whitish, edges of other primaries and of secondaries uniform olive-green. Fifth quill longest, fourth and sixth scarcely shorter; first shorter than ninth. Legs stout, claws much curved. Tail wanting in the single specimen before us (a male from the city of Mexico, belonging to Mr. G. N. Lawrence). _Dimensions_ (prepared specimen): Wing, 3.70. Exposed portion of first primary, 2.30; of second, 2.73; of longest (measured from exposed base of first primary), 2.85. Bill: Length from forehead, .75; from nostril, .45. Legs: Tarsus, 1.14; middle claw, .38; hind toe and claw, .85; claw alone, .52. In describing this species, Swainson mentions an accompanying specimen as similar, but without any white spots on wings, suggesting that it may be the female. A specimen in the plumage from Oaxaca is characterized as follows. [19] _Pipilo chlorosoma_, BAIRD. 50,225 ♂, Oaxaca. Similar to _P. macronyx_ in color, but without any trace of white markings on the wings. Outer tail-feathers with an obscurely defined greenish-white patch about an inch long, at the end of inner web; similar, but successively smaller patches on the second and third feathers, all whiter on upper than lower surface. Fifth quill longest; first shorter than ninth. _Dimensions_ (prepared specimen): Total length, 8.20; wing, 3.75; tail, 4.80. Bill: Length from forehead, .73; from nostril, .43. Legs: Tarsus, 1.24; middle toe and claw, 1.10; claw alone, .36; hind toe and claw, .85; claw alone, .50. No. 60,050, Mexico, is similar, in all essential respects. From the analogies of the black Pipilos, it is reasonable to consider these two birds as distinct species, or at least varieties, especially as the specimen before us of that with unspotted wings is marked male. The general appearance is otherwise much the same, the unspotted bird rather smaller, and without the dusky interscapular markings described in _macronyx_. Should No. 50,225 represent a distinct species, it may be called _P. chlorosoma_, and distinguished as above. (60,050, Mexico, BOUCARD.) [20] _Pipilo lateralis_ (NATT.). _Emberiza lateralis_, NATT. Mus. Vind. MSS. _Poospiza lat._ BURM. Th. Bras. III, Av. 2, p. 215. _Pipilo superciliosa_, SWAINS. An. Menag. 311, 95, fig. 59. SECTION I. _Head black._