TETBAONIDiE. 
S4>S 
FAMiiv TETRAONID^. Partridges and Grouse. 
Bill and tail very short. Hallux elevated. 
Cryptonvx, Tern. BiU short, thick ; the mandihles of 
equal length. Nostrds placed in the in^iddle of Ae 
biU and covered hy a long naked membrane. Feet 
large. The hinder toe elevated, and without a claw. , 
Head conspicuously crested. 
C. corcmatus. Mus. Carl. pi. 64. 
« Vieil. BUI naked at the base, con- 
°vex\hove, much compressed, and with a double tooth 
near the point. Orbits and lores naked. 
Tocro of Bufl'on. 
Ortygis, 111. Bill moderate, slender, straight. Nos- 
trils lateral, linear, placed near the middle of tlm to . 
Feet three-toed, slender. Hind toe wanting. Wings 
and tail very short ; the latter nearly concealed. 
O. nivosus. 55ool. 111. i- P'- 
y-t Hill cViort very thick. arsus lea- 
'^Tered Cr-ioed. Eyebrows naked. Tail moderate, 
of twelve feathers. AVings short. 
rpfrao Linn. The tarsus feathered, hut the toes naked. 
Tdes of the neck, in the male, often with elongated 
Jelers. Tail even. Eyebrows plumed. 
T. Scoticus. Selby, pl- 59- f. I • 
r , Willurfihv. BUI with the base thickly fea- 
S. EyebrowJnaked and smooth. Tarsus and toes 
thickly covered with feathers. 
L. mutus. Selby, pl- 59. f. -• 
Sw. Toes naked. Tail lyre-shaped. 
^ L. tetrix. Selby, pl. 58. 
Pterooles, Tern. W Grouse. Toes naked. Bill 
slender ; the base thickly covered feaUiera h^^ 
hind toe very short, or entirely wanting. g 
pointed. Tail graduated or cuneated. 
p. arenarius. lU. Col. 52 . paradoxus. Pl. Co . 
z 4 
