Form. Small and slender; bill, moderate, rather long; wings, moderate; tail, long, several of the central feathers equal, others shorter and graduated, outer feathers shortest; legs and feet, long and slender. Dimensions. Total length (of skin) about 4¼ inches; wing, 12¾; tail, 2¼; inches. Colors. _Male._—Head, above, glossy black; upper parts of the body and wings, grayish-cinereous or lead-colored; lower parts very pale ashy-white, deeper on the sides and flanks; quills, brownish-black, edged externally with ashy-white; tail, black, the two outer feathers tipped with white, having their outer webs of that color, the next two also edged on their outer webs with white and tipped with the same, readily seen on the inferior surface of the tail; bill and legs, dark. _Female_, with the head above uniform with the other parts—not black—otherwise, like the male. Hab. Texas, Mexico. Spec. in Mus. Acad., Philada., and Nat. Mus., Washington city. Obs. This species very much resembles the South American _Culicivora leucogastra_, De Wied, (which is _C. atricapilla_, Swainson,) but is smaller. We have never seen specimens of the present species with the under parts of such a clear white as is usual in the larger bird just mentioned, though it may assume it in its perfectly mature plumage. The South American bird measures in total length about five inches. The Prince of Canino’s description of _Culicivora mexicana_ as cited above, we regard as applicable to the female of the present species. All the species of this genus more or less resemble each other, and now require careful revision, having the appearance to us of being rather confused than otherwise, and but imperfectly described. [Illustration: Plate 28 The Prince Maximilian’s Jay Gymnokitta cyanocephala (_DeWied_)] GYMNOKITTA CYANOCEPHALA.—(De Wied.) The Prince Maximilian’s Jay. PLATE XXVIII.—Adult Male. We have the pleasure of presenting to the reader, in the plate now before him, one of the most singular of the birds of the family of Crows and Jays yet known to inhabit North America.