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DUSKY GROUS.
TET:AO OBSCURUS.
Plate XVIII. Female.
TdtaM  euriw, SAY, in Logs Exped. to Roky Mount. II, p. 14. NOB. Cat. Birds
U 5. Sp 209, in Conr MaCI. Lye. Phila. I, P. 3. ID. Syn. Bi. S. Sp. 207,
in .nn. ye. Nat. Hist. N. 1 pp. 127, 442.
Philacdephia Muweum, Female.
Colection of Mr. Sabine, in London, Male and Female.
X LINN*, in his genus Tetrao, brought together so great a number
of species bearing no more than a distant resemblance to each
bther. and differinff not only in their external characters. but even
in their peculiar habits, that he might with almost the samb
propriety have included in it all typical gallinaceous birds.
Latham very judiciously separated the genus Tinamus, as well as
that of Perdix, which latter he restored from Brisson. Illiger
likewise contributed to our better knowledge of these birds by
harieterizing two more natural genera, Syrrhaptes and Ortygis.
Temniinck, in his listoire des Galns, carried the number to
seven, but has sinmce reduced it by reuniting Coturnix to Perdix.
The truie T ns are divided bby Vieillot into two genera, the
Ct one by themselves 'These however
n a subgenus, of which we distinguish
I. Lagopus, which represents it in
for whose climate they are admirably
to the very nails: in plumage suited to
I abundantly with thick dowvn, upon
losely applied. The colour of their