346 , AVES. 
light blue colour and a stony hardness, almost as large as its 
head. Itis black; the lower part of the belly and the tip of the . 
tail, white. It lays its eggs onthe ground. Its original habitat, 
is not exactly known. The trachea descends externally along 
the right side to behind the sternum, where it inclines to the 
left, and ascends to enter the thorax, through the fourchette. All 
its rings are compressed. « ~ ' dy 
There is another species, which, instead of the tubercle on 
the beak, has a red salient crest. The belly and tip of the ‘tail 
are chesnut colour. It is the true Mittu of Marcgrave; Ourax 
mittu, Tem. Col. 153; Crax galeata, Lath.; Crax tore ae Spix, 
Ixiii.(1) . ' 0 rim 
PENELOD? Merr. : ' 4 
The Guans or Yacous(2) have a slenderer-beak than the Hoccos; 
the circumference of the eyes is naked, as well as the under part of 
the throat, which is generally susceptible of being inflated. 
Several varieties of colour are found also among these birds, 
between which it is very difficult to establish specific limits... 
Those which have a tuft are sometimes of various shades of 
brown or bronze—Penelope jacupema, Mer. II, xi; sometimes 
spotted on the breast—Penelope cristata, L., Edw. 135(3) some- 
times black, with the same spots, and more or less white on 
the tuft and coverts of the wings—Penelope leucolophos, Merr. 
Il, xii, or Pen. cumanensis, Gm.; Jacq. Beytr. pl. 10; Bajon, 
Cay., pl. 5, or Pen. jacutinga, Spix, pl. Ixx. Some of them are 
intermediate between these two extremes,—Pen. pipile, Jacq. 
Beytr. pl. xi. 
The trachea, at least in the first, descends under the skin far 
behind the posterior edge of the sternum, ascends, is again 
flexed, and then continues its course towards the fourchette, 
through which, as usual, it gains access to the lungs. A spe- 
cies almost without crest, 
Pen. marail, Enl. 338, Vieill. Gal. 198, gr eenish-blhcky Swath 
(1) Add, Crax tuberosa, Sp. LX VII, a;—Cr. uramutum, Id., LXII. N.B. The 
Chacamel, Buff. (Crax vociferans) founded on a vague indication of Hernandez, cap. 
XLI, is not authentic. Sonnini even thinks it may be the Falco vulturinus. The 
Caracara of Buff. and Dutertre is the Agami (Psornra). 
(2) Gowan and Yacou are the names of these birds in Guiana and Brazil. That 
of Penelope, given to them by Merrem, designated among the Greeks a species of 
Duck, which, according to them, had saved the wife of Ulysses from drowning 
when a child. 
(8) The P. jacuaza, jacucaca, jacupeba, jacubemba, guttata, and arra cuan, of 
Spix, LXVIII—LXXV, closely approach the P. cristata, if they are not mere vari- 
eties ofit. The P. marail, Vicill., Gal., 198, corresponds most with the jacupeba. 
