XXII. COMPARISON OF EXTERNAL CHARACTERS OF Castor canadensis frondator MEARNS, FROM THE SAN PEDRO 

 leucodonta GRAY, FROM VANCOUVER ISLAND. BRITISH COLUMBIA, AND WITH CastoZnlZstclnldeZs 



Castor canadensis frondator Castor canadensis leucodonta 



Points of Comparison (one example) (six examples) 



General coloration Lightest of the three. Darker than ln frondator 



Dorsal overhair Varying about cinnamon. Varying about cinnamon-buff; no. 12108 



with liberal insprinkling of seal brown 

 hairs. 



Dorsal underfur Paler tints of the drab series than are Darker than in frondator. Varying from 



found in either leucodonta or canadensis, fuscous and fuscous-black to benzo and 



near cinnamon-drab, light cinnamon- hair brown, 

 drab, and light drab. 



Forefeet Mixture of colors which in combination ap- Light brownish drab to near russet or mars 



proach clay color and hazel. brown. 



Hind feet Mixture of colors which approach clay Paler brown than in canadensis, varying 



color and chestnut-brown; the chestnut- from near carob brown to near hazel. 



brown more in evidence making foot ap- 

 pear darker. 



Ventral overhair Close to cinnamon-buff. Varying about hair brown. 



Ventral underfur Paler than frondator, approaching pale ecru- Darker than in frondator, approaching 



drab and pale drab-gray. light drab and light cinnamon-drab. 



Throat band Practically undifferentiated, absent, though Inconspicuous; the few hairs present vary 



the overhairs on throat and chin are paler about warm buff, 



than those posteriorly, being colored near 

 pinkish buff. 



Base of tail above A fringe of hairs at immediate base of tail Varies from near hair brown (no. 12111) 



colored near hazel and chestnut-brown. to a shade between chocolate and bay (no. 



12107); fringe of hairs near dark vinace- 

 ous-drab in several specimens (notably 

 nos. 12108, 12101, 12102). 



Base of tail beneath Broad area at immediate base of tail near Between cinnamon-brown and chestnut or 



hazel and chestnut-brown in coloration. bay. 



Tail 



Broader proportionally than the average of 

 leucodonta; much broader than canadensis. 



Broader proportionally than canadensis, 

 narrower on the average than frondator. 



RIVER, MEXICO, WITH Castor canadensis 

 KUHL, FROM EASTERN CANADA 



Castor canadensis canadensis 

 (two examples) 

 Darker than in leucodonta. 

 Hairs a mixture of blackish and ochraceous- 

 tawny (nos. 174525, 174526, former the 

 darker); general effect near chocolate or 

 bay. 

 Near clove brown (nos. 174525, 174526). 



General impression pale brownish drab 



(no. 174525); approaching warm blackish 



brown (no. 174526). 

 Near dark vinaceous-drab (no. 174525); 



similar but with tendency to be lighter 



(no. 174526). 



Bone brown, dark grayish brown, or dusky 

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

 dark vinaceous-drab or natal brown (no. 

 174526). 



Shaft of hair pale, nearest pale gull gray, 

 tipped with drab-gray (nos. 174525, 

 174526). 



Definite throat band present, the scattered 

 paler hairs being near cinnamon-buff (no. 

 174525); nearer ochraceous-buff (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). 



Narrowest proportionally of the subspecies 

 here compared. 



