1870.] MESSRS. SCLATER AND SALVIN ON THE CRACID. 525 
from which it is mainly distinguishable by its larger size and gene- 
rally greener and lighter colour. 
6. PENELOPE OBSCURA. 
El Yacthi, Azara, Apunt. iii. p. 72. no. 335. 
Penelope obscura, Temminck, Pig. et Gall. iii. p. 68, et p. 693; 
Vieill. Nouv. Dict. xxxvi. p. 343, et Enc. Méth. 361; Wagler, Isis, 
1830, p. 1111. 
Penelope nigricapilla, G. R. Gray, P. Z.S. 1860, p. 269; List of 
Gall. p. 7; Reichenb. Tauben, p. 152. 
Penelope bridgesi, G. R. Gray, P. Z.S. 1860, p. 270; List of 
Gall. p. 7; Reichenb. Handb. Tauben, p. 151. 
Obscure eneo-viridis: dorso inferiore et abdomine toto chocola- 
tino-brunneis : dorsi superioris, tectricum alarium et corporis 
subtus ad medium ventrem plumis albo marginatis : pilei antici 
plumis argenteo anguste marginatis: long. tota 25, ale 11°5, 
caude 12, tarsi 3. 
Hab. Paraguay (Azara); Rio Vermejo et Rio Paraguay (Page) ; 
Bolivia (Bridges). 
Mus. Brit., Smiths. et 8.-G. 
The examination of four skins of this Guan obtained by Capt. 
T. J. Page during his expeditions up the Parana and its confluents 
in the United-States steamer ‘ Waterwitch,’ and now in the Smith- 
sonian Collection, have enabled us to identify it with Azara’s Yacthi, 
which has hitherto remained unrecognized. Not only does the bird 
agree sufficiently well with Azara’s description, but one of Capt. 
Page’s specimens bears a label with ‘‘ Pavo del Monte ” written on it, 
the provincial name, according to Azara, of his Yacthi. It follows, 
therefore, that we must use for this bird the name obscura, founded 
by Temminck upon Azara’s description. 
Upon comparing the above-mentioned birds with the types of 
Penelope bridgesi and P. nigricapilla in the British Museum we have 
no doubt of their identity. The latter has but faint traces of white 
markings on the head; but two of Capt. Page’s specimens, which we 
consider not quite mature, have likewise but very slight indica- 
tions of this feature. Having thus had the advantage of examining 
six specimens of this Guan at one time, we see that considerable 
variation is shown in the extent of the white markings on the feathers 
of the head, a character upon the constancy of which Mr. Gray 
seems to have depended too much when differentiating his P. nigri- 
capilla and P. bridges. 
7. PENELOPE CRISTATA. 
Meleagris cristata, Linn. 8. N.i. p. 269 (?). 
Penelope cristata, Lath. Ind. Orn. ii. p. 619; Temm. Pig. et 
Gall. iii. p. 46 et p. 691; Wagler, Isis, 1830, p.1110; Burm. Syst. 
Ueb. iii. p. 339. 
Salpiza cristata, Wagl. Isis, 1832, p. 1226; Cab. in Schomb. 
Guian. iii. p. 745. 
Proc. Zoou. Soc.—1870, No. XXXV. 
