Pteroptochos megapodius. _Kittl._ 1830, Mem. de l’Acad. 1, pl. iv. et Vogel, von Chili, p. 10, pl. iv. Megalonyx rufus. _Less._ Cent. Zool. 1831, pl. 66. —— _D’Orb. & Lafr._ Leptonyx macropus. _Swains._ Zool. Ill. pl. 117. —— _D’Orb. & Lafr._ Voy. de l’Amer. Mer. Av. 197. This bird is common in the dry country of central and northern Chile, where it replaces the _P. Tarnii_ of the thickly wooded southern regions. The _P. megapodius_, is called by the Chilenos, “_El Turco_;” it lives on the ground amongst the bushes which are sparingly scattered over the stony hills. With its tail erect, every now and then it may be seen popping on its stilt-like legs from one bush to another with uncommon celerity. Its appearance is very strange and almost ludicrous, and the bird seems always anxious to hide itself. It does not run, but hops, and can hardly be compelled to take flight. The various loud cries which it utters, when concealed in the bushes, are as strange as its appearance. I opened the extremely muscular gizzards of several of these birds, and found them filled with beetles, vegetable fibres, and pebbles. Observing the structure of the gizzard, the fleshy covering to the nostrils, and the arched, rounded wing, and great scratching claws, it was easy to imagine some distant kind of relationship between these birds and those of the Gallinaceous order. I was informed that the Turco makes its nest at the bottom of a deep burrow which it excavates in the ground. 3. PTEROPTOCHOS ALBICOLLIS. _Kittl._ Pteroptochos albicollis. _Kittl._ Mem. de l’Acad. Petersb. 1. pl. iii. Vogel von Chili; p. 8. pl. iii. Megalonyx medius. _Less._ Ill. Zool. pl. lx. Megalonyx albicollis. _D’Orb. & Lafr._ Mag. de Zool. (1636,) Aves, p. 15. Leptonyx albicollis. _D’Orb._ Voy. de l’Amer. Mer. Av. p. 196, pl. viii. f. 2.