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BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Genus CANACHITES Stejneger 



Catiace (not of Curtis, 1838) Reichenbach, Av. Syst. Nat. Vog., 1853, xxix. 



(Type, by monotypy, Tetrao canace Linnaeus, which here = T. canadensis 



Linnaeus.) 

 Canachites Stejneger, Proc. U. S. Nat. Mus., viii, 1885, 410. (Type, by original 



designation, Tetrao canadensis Linnaeus.) 

 Tympanuchus Reichenow, Die Vogel, i, 1913, 320, part. 



Small wood grouse (length about 165-187 mm.) with a general re- 

 semblance in form to Dendragapus but with only 16 (instead of usual 20) 

 rectrices, and adult males without an inflatable air sac on sides of neck; 

 coloration very different. 



Bill relatively small, its length from frontal antiae about one-fourth 

 the length of head, its depth at same point about equal to its width; 

 culmen very indistinctly ridged ; rhamphotheca smooth throughout ; maxil- 



Figure 9. — Canachites canadensis. 



lary tomium distinctly but not strongly concave or arched. Wing moder- 

 ate or rather small, with longest primaries projecting beyond tips of 

 longest secondaries between one-fourth and one-third the length of wing ; 

 third and fourth primaries longest (the fifth nearly as long), the first 

 (outermost) intermediate between seventh and eighth; inner webs of 

 three outer primaries slightly emarginate or sinuate. Tail about two- 

 thirds as long as wing, more or less rounded, the rectrices (16) broad, 

 with tips broadly rounded (C. canadensis) or nearly truncate (C. 

 jranklinii). Tarsus less than one-fourth as long as wing, completely and 

 densely clothed with soft, hairlike feathers; except on heel, the basal 

 phalanx of middle toe also feathered along each side (except in sum- 

 mer) ; middle toe very slightly shorter than tarsus ; lateral toes about 



