Xii COMPARISON OF EXTERNAL CHARACTERS OF Castor canadensis leucodonta GRAY, FROM VANCOUVER ISLAND, BRITISH COLUMBIA, WITH Castor canadensis pacificus RHOADS, 

 FROM WASHINGTON STATE, Castor canadensis canadensis KUHL, FROM EASTERN CANADA, AND Castor canadensis phaeus HELLER, FROM ADMIRALTY ISLAND, ALASKA 



p ints of Comparison Castor canadensis leucodonta 



(six examples) 



Amount of pelage Medium. 



General coloration Paler than in canadensis or phaeus. 



Dorsal overhair Varying about cinnamon-buff; no. 12108 



with liberal insprinkling of seal brown 

 hairs. 



Castor canadensis pacificus 

 (one example) 

 Heavier pelage than in leucodonta. 

 Paler than In leucodonta. 

 Varying from cinnamon in the middle of 

 the back to lighter tints both anteriorly 

 and posteriorly, attaining a pinkish buff 

 color above the tail and on the cheeks. 



Dorsal underfur Varying from fuscous and fuscous-black to Varying about brownish drab. 



benzo and hair brown. 



Top of head Not conspicuously different from rest of Somewhat lighter than middle of back. 



dorsal coloration. Difference not conspicuous. 



Ventral overhair Lighter than in phaeus; varying about hair Cinnamon-drab to light cinnamon-drab. 



brown. 



Hind feet Paler brown than in canadensis, varying Close to benzo brown. 



from near carob brown to near hazel. 



Base of tail above Varies from near hair brown (no. 12111), Varies from the fringe of cinnamon-drab or 



to a shade between chocolate and bay benzo brown hairs to cinnamon-buff or 



(no. 12107); fringe of hairs near dark even to pinkish buff ten cm. anteriorly of 



vinaceous-drab in several specimens base of scaled portion of tail, 

 (notably nos. 12108, 12101, 12102). 



Base of tail beneath Between cinnamon-brown and chestnut or Cinnamon-buff to pinkish buff, with a wash 



bay of cinnamon-drab close to base of scaled 



portion of tail. 



Throat band Inconspicuous; the few hairs present vary Inconspicuous; lacking as a band. 



about warm buff. 



T »« _ Intermediate in width in proportion to Narrower proportionally than in any of the 



length, between canadensis and phaeus. others. 



Castor canadensis canadensis 

 (two examples) 

 Heavier pelage than in leucodonta. 

 Darker. 

 Similar to phaeus but no specimen as 



dark as no. 209. Hairs a mixture of 



blackish and ochraceous-tawny (nos. 



174525, 174526); general appearance near 



chocolate or bay. 

 Near clove brown (nos. 174525, 174526). 



Similar to rest of upper parts. 



Bone brown, dark grayish brown, or dusky 

 drab (no. 174525); a trifle paler, near 

 dark vinaceous-drab or natal brown (no. 

 174526). 



Near dark vinaceous-drab (no. 174525); 

 similar but with tendency to be paler 

 (no. 174526). 



Cinnamon-drab to verona brown; hairs at 

 immediate base of tail tipped with seal 

 brown (no. 174525); chestnut to bay; 

 hairs at immediate base of tail tipped 

 with seal brown (no. 174526). 



Mixture of chestnut and cinnamon-drab, ap- 

 proaching pinkish buff laterally and an- 

 teriorly (no. 174525); liver or carob 

 brown approaching orange-cinnamon lat- 

 erally and anteriorly (no. 174526). 



Definite throat band near cinnamon-buff 

 (no. 174525); nearer ochraceous-buff (no. 

 174526). 



Narrower in proportion to length than in 

 either leucodonta or phaeus. 



Castor canadensis phaeus 

 (two examples) 

 Heavier pelage than in leucodonta. 

 Darker. 



No. 210, between cinnamon and sayal 

 brown; no. 209, seal brown, clove brown 

 or blackish. 



Benzo brown to bone brown (no. 210); light 



seal brown to benzo brown (no. 209). 

 Conspicuously different from rest of dorsal 



coloration. Orange-cinnamon (no. 210); 



mikado brown (no. 209). 

 Darker than in leucodonta. Varying about 



verona brown and warm sepia (nos. 209 



and 210). 



Lighter than in canadensis. Near mars 

 brown, burnt umber or Hay's brown 

 (no. 210); deep brownish drab (no. 209). 



Bister immediately at base, becoming paler 

 anteriorly (no. 210) ; near warm sepia 

 (no. 209). 



Hazel to chestnut (no. 210); varying about 

 verona brown, warm sepia and mars 

 brown (no. 209). 



Varying about cinnamon-buff, slightly paler 

 dorsally, slightly darker ventrally (no. 

 210); few scattered pinkish buff hairs 

 (no. 209). 



Broader than in either leucodonta or cana- 

 densis in proportion to length. 



