66 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



cc. Tail not at all forked (rounded, truncate, or even graduated). 



d. Tail rounded or truncate, with middle pair of rectrices not projecting 

 beyond next pair. 

 e. Larger (wing 275 mm. or more) ; adult males with feathers of throat 



elongated and plumage partly metallic Tetrao (extralimital)"" 



ee. Smaller (wing less than 255 mm.) ; adult male with feathers of throat 

 not elongated and plumage without any metallic colors. 

 /. Tail more than half as long as wing; no elongated feathers on 

 sides of neck and air sac, if present (usually absent or not ob- 

 vious), relatively small. 

 \g. Tail more than three-fifths as long as wing with longer coverts fall- 

 ing far short of its tip ; toes never feathered and plumage never 

 wholly or mostly white. 

 h. Rectrices 20; males with a distinct cervical air sac; larger (wing 

 more — usually much more — than 218 mm.). 



Dendragapus (p. 67) 

 hh. Rectrices 16 ; males without a cervical air sac ; smaller (wing 

 less than 190 mm.). 



i. Outermost primaries of normal form Canachites p. 136) 



u. Outer primaries falcate Falcipennis (extralimital)™ 



gg. Tail less than three-fifths as long as wing, with longer coverts 

 reaching to its tip; toes densely feathered in winter; plumage 

 entirely or for much the greater part white in winter. 



Lagopus (p. 90) 



Tetrao (emendation) Ledru, Vog. Teneriffe, i, 1810, 184. — Tetroa (lapsus or typog. 

 error) Richardson, Parry's Journ. Second Voy., Appendix, 1825 (1827), 347. — 

 Lyrurus Swainson and Richardson, Fauna Bor.-Amer., ii, 1831 (1832), 342, 497 

 (type, by monotypy, Tetrao tetrix Linnaeus) ; Hartert, Vog. pal. Fauna, iii, 1921, 

 1872; Peters, Check-list Birds of World, ii, 1934, 26.— Lynrus (lapsus?) Gould, 

 Proc. Zool. Soc. London, 1837 (1838), 132. — Lytira (emendation) Giebel, Thes. 

 Orn., ii, 1875, S\2.— Tetrix Morris, in W. Woods' Naturalist, ii. No. 9, June 1837, 

 126 (type, by tautonymy, Tetrao tetrix Linnaeus). — Lagopotctrix Malm, Vet- 

 Akad. Forh., 1880, No. 7, 7, .30 (type, by monotypy, L. dicksoni Malm=hybrid of 

 Tetrao tetrix and Lagopus scoticus). Palearctic Region (western Europe to west- 

 ern Siberia). Two species. 



The type species, the black cock or black game, of Europe (L. tetrix), has been 

 introduced into North America but seems not to have become established. 



°* Tetrao Linnaeus, Syst. Nat., ed. 10, i, 1758, 159 (type by subsequent designa- 

 tion, Tetrao urogallus Linnaeus, Gray, List Gen. Birds, 1840, 62) .—Urogallus 

 Scopoli, Introd. Nat. Hist., 1777, 478 (type, by tautonymy, Tetrao urogallus Lin- 

 naeus). — Capricalea "Niles[son]" S.D.W., Analyst, iii. No. 14, Jan. 1836, 206 

 (type, by tautonymy, C. arborea S.D.'W. =Tetrao urogallus Linnaeus). Palearctic 

 Region. Two species. 



The type species of this genus also, the capercaille, wood grouse, or cock-of- 

 the-woods (Tetrao urogallus), has been liberated in North America but seems 

 not to have become established. It is the largest of the grouse, the adult male 

 nearly if not quite equaling a hen turkey in bulk and weight. 



'"Falcipennis Elliot, Proc. Acad. Nat. Sci. Philadelphia, 1864, 23 (type, by mono- 

 typy. P- hartlaubii Elliot=r^/rao falcipennis Hartlaub). 



This monotypic genus of northeastern Asia is the Palearctic representative of 

 Canachites, from which it seems to differ chiefly in its falcate outer primaries. 



