much redder, less blackish; skull larger and broader across mastoids, 

 much more constricted behind postorbital processes. 



Color. Lustrous chestnut brown, somewhat paler below; cheeks, 

 lips, chin, throat, and sides of neck grizzled yellowish brown. 



Measurements. Type (not in the flesh). Total length, 1285; tail 

 vertebra^, 487; hind foot, 130. Skull, type: basal length, 106.6; 

 zygomatic breadth, 71; mastoid breadth, 71.2; interorbital constric- 

 tion, 24; greatest constriction, 18.6; across postorbital processes, 

 35; last upper molar to end of pterygoid process, 29.8; foramen 

 magnum to end of palate, 51.6; single half of mandible length, 74.4. 

 (Bangs, 1. c.) 



c. — pcicifica. (Lutra), Rhoads, Trans. Am. Phil. Soc. U. S., 1898, 



P- 431. 



parancnsis and atterima, Thomas, P. Z. S., i88g, p. igg. 



californica, Baird (nee Gray), N. Am. Mamm., 1857, p. 187. 



Type locality. Lake Kichelos, Kittitass County, Washington. 



Geogr. Distr. Pacific slopes; California to Alaska. 



Genl. Char. Size large; skull very large, teeth comparatively 

 weak, interorbital width nearly i J^ times postorbital constriction. 

 Audital bullae flattened. 



Color. Lighter than /. canadensis, and more brownish. Above 

 ruddy seal brown; lower parts lighter; throat, neck and breast pale 

 wood brown. Ventral region very light. 



Measurements. Total length, 11 15; tail vertebra;, 419; hind foot, 

 128. Skull: occiput to end of premaxilla, 115. 5; zygomatic width, 

 72.5; mastoid width, 69; interorbital constriction, 25; postorbital 

 constriction, 20. 



(L—sonoru. (Lutra), Rhoads, Proc. Am. Phil. Soc, 1898, p. 431. 



canadensis, Mearns, (nee Kerr), Bull. Am. Mus. Nat. Hist., 1891, 



P- 253- 



Type locality. Montezuma Well, Beaver Creek, Yavapai County, 

 .\rizona. 



Geogr. Distr. Mexico to Wyoming. 



Genl. Char. Size large; hind foot long. Postorbital processes 

 of skull attenuated. 



Color. Above dark brown, changing to pale grayish brown 

 below, being whitish on undersides of head and neck. The hairs on 

 head and neck above tipped with yellowish brown. 



.\feasurements. Total length, 1300; tail vertebra', 472; ear, 15. 



521. degener. {Lutra), Bangs, Proc. Biol. Soc. Wash., 1898, p. 35. 

 Type locality. Bay St. George, Newfoundland. 

 Genl. Char. Size small, tail short, skull small and weak with 



