Of the genus Momotus were obtained two species: the first, the common Brazilian or blue-headed motmot; this was quite common in Yucatan, but not so common as the other, as to which it is doubtful whether it has been described. It is about the same length as the blue-headed, but the tail is longer in proportion to the body. The markings on the plumage are very different from those of the Brazilian; there is a black stripe extending down from the chin to the middle of the breast, bordered on each side with light blue; a broad, light blue, almost white, stripe extends over the eye from the base of the bill almost to the hind head. The general colour is a sort of greenish bay; primaries and tail light green, tipped with black; the two central feathers of the tail much longer than in the Brazilian, having the shaft bare to a much greater degree, and the feather at the tip is bright pale green, tipped broadly with black. Of the genus Crotophaga one species was procured, the lesser ani (Crotophagi Ani. Ind. Orn., vol. i., p. 448). These were very abundant in all parts of the country. Of the genus Oriolus, including under this denomination Icterus and Cassicus, were procured five species, one of which is supposed to be new, three doubtful, and one known. The male of the new species is nine inches and a half long; head, neck, cheeks, breast, belly, rump, tertiaries, and nearly the whole length of the outer tail feathers and the lower part of the third, and occasionally a stripe on the fourth, bright chrome yellow; face, throat, primaries, secondaries, back, and four, and sometimes six tail feathers, black; legs bluish; bill black, except the base of lower mandible, which is bluish; sings finely. Female eight inches and seventh eighths long; marked like the male, but not so brilliant; irides hazel. One of the doubtful comes very near to Latham's description of the lesser Bonana bird (Oriolus Xanthornus. Ind. Orn., vol. i., p. 181), but is an Icterus, and differs in some particulars of plumage. Another of the doubtful resembles closely the black oriole, and another the black cassican, but is smaller. The known species is the St. Domingo oriole (Oriolus Dominicensis. Ind. Orn., vol. i., p. 182). Two specimens of this bird were procured, being the only two that were seen. Of the genus Cuculus, including Polophilus, were procured two species. One resembles somewhat the bird described by Latham as the variegated coucal (Polophilus Variegatus); the other the Cayenne cuckoo (Cuculus Cayanus. Ind. Orn., vol. i., p. 221). These were both quite abundant throughout the country. Of the genus Picus were procured three species, two of which are perhaps new. One of these resembles the little woodpecker of Europe (Picus Minor) very closely. The other resembles Latham's description of the Brazilian woodpecker (Picus Braziliensis). The known one is the lineated woodpecker (Picus Lineatus. Ind. Orn., vol. i., p. 226).