_Description._--Dark bronzy green; lower back and abdomen chocolate-brown; feathers of upper back, wing-coverts, and body beneath down to the middle of the belly margined with white; feathers of front part of head edged with silvery white: whole length 25·0 inches, wing 11·5, tail 12·0. _Female_ similar. _Hab._ Paraguay, Northern Argentina, and Bolivia. This Guan was first made known to us as an inhabitant of Paraguay by Azara, who described it in his 'Apuntamientos'[9] under the name of "El Yacúhú" or "_Pavo del Monte_" (Wood-Turkey) of the Spaniards. The examination of skins of it obtained by Capt. J. T. Page, of the U.S. Navy, during his expedition up the Rio Paraguay and Rio Vermejo, enabled Messrs. Salvin and Sclater to make this identification. [9] Vol. iii. p. 72, no. 335. In Entrerios, Mr. Barrows tells us, this species is limited to the borders and islands of the River Uruguay, where in heavy growths of timber it is not uncommon, though rarely seen. Here it builds a large nest in the trees and lays white eggs. It is probable that the Guan of Tucuman called by Dr. Burmeister _Penelope boliviana_ and that of Catamarca referred by White to _P. pileata_ likewise belong to this species. 367. PIPILE CUMANENSIS (Jacq.). (WHITE-HEADED GUAN.) +Penelope pipile+, _Burm. La-Plata Reise_, ii. p. 499 (Tucuman). +Pipile cumanensis+, _Scl. et Salv. P. Z. S._ 1870, p. 529; _Burm. P. Z. S._ 1871, p. 702 (Tucuman). _Description._--Bronzy black; whole top of the head white, with narrow black shaft-stripes; wing-coverts and breast-feathers edged with white; a large blotch on the wing white; naked cheeks and throat-caruncle blue: whole length 27·0 inches, wing 13·0, tail 11·0. _Female_ similar. _Hab._ South America from Venezuela to Northern Argentina. Dr. Burmeister tells us that this Guan, which is widely extended in South America, occurs in the forests of Tucuman. 368. ORTALIS CANICOLLIS, Wagl. (HOARY-NECKED GUAN.) +Penelope canicollis+, _Burm. La-Plata Reise_, ii, p. 499. +Ortalida canicollis+, _Scl. et Salv. P. Z. S._ 1870, p. 534; _iid. Nomencl._ p. 136; _Burm. P. Z. S._ 1871, p. 701. +Ortalis canicollis+, _Salvin, Ibis_, 1880, p. 303 (Tucuman). +Ortalida guttata+, _White, P. Z. S._ 1882, p. 627 (Salta)? _Description._--Above bronzy brown; top of head cinereous: beneath more ochraceous; throat and breast washed with bronzy; neck and breast slightly spotted with greyish; under wing-coverts, flanks, and crissum chestnut; tail bronzy green, five outer rectrices broadly tipped with chestnut; bill yellowish; feet pale hazel: whole length 22·0 inches, wing 9·8, tail 10·3. _Female_ similar. _Hab._ Paraguay and Northern Argentina.