Of the genus Muscicapa were obtained five species, four of which have been described. The specimen procured of the fifth was a male. It is six inches and a half long; bill one inch along the gap quite stout and broad; top of the head and nape black; back, wings, and tail very dark, slaty brown; breast, belly, cheeks, and chin light cinereous; throat and upper part of the breast bright rose colour; legs black. This was the only specimen seen in the country. The others were Muscicapa Coronata (round-crested flycatcher. Shaw, vol. v., pl. 13). This is quite common throughout Yucatan. Muscicapa Sulphuratus, not rare; M. Barbata, quite common; M. Ferox, very common. Of the genus Sylvia one was obtained, in young plumage, and, therefore, uncertain whether new or not. Of the genus Caprimulgus one species was obtained; the specimen so poor that nothing can be made of it. Of the genus Columba were procured two species, one of which is in such imperfect plumage that its character cannot be made out. The other agrees very nearly with the blue pigeon (Columba Caerulea. Ind. Orn., vol. ii., p. 601). Both are common in Yucatan. Of the genus Meleagris was procured one species (Meleagris Ocellata), the ocellated turkey, Cuv. This most magnificent bird is common throughout Yucatan. Of the genus Penelope were procured two species; one the crested guan (P. Crestata. Ind. Orn., vol. ii., p. 619). These are called kosh by the natives; the only specimen seen was given to Dr. Cabot by the brother of the padrecito at Ticul, and was still alive in November, 1842. The other is the Penelope, or Phasianus Paragua (Ind. Orn., vol. ii., p. 632). They are common in all parts of Yucatan, where they are called chachalacha, from the noise they make, which is perfectly astounding, and also bach by the Indians. They have a most remarkable arrangement of the trachea, which passes down on the external surface of the muscles, between them and the skin, in a long loop as low as the pubis, and then passes up on the other side, and enters the thorax. Of the genus Crax two species were obtained; the red curassow (Crax Rubra, Lin., vol. i., p. 270), and C. Globicera (globose curassow). They are found throughout the country, and are called by the natives kambool. Of the genus Tinamus one species was obtained, the variegated tinamou (T. Variegatus). They are quite common throughout Yucatan, where they are called by the natives partridges. They are kept tame in many of the houses, being very useful in destroying scorpions, &c. Of the genus Onyx one species was obtained, which, as far as the plumage and size go, is undescribed, but it has the same note, habits, &c., as our quail or partridge. It is smaller; the throat of the male is jet black, and most of the markings are different, though having a general resemblance to the Ortyx or Perdix Virginianus. They are very numerous in all parts of Yucatan.