258 Field Museum of Natural History — Zoology, Vol. XL 



casins, etc. They were split and dyed a variety of colors with roots, 

 barks and berries, some of these garments, especially those worn by 

 chiefs, having been very elaborate and highly prized. 



Albinistic examples of this animal are occasionally taken. There 

 is an entirely white specimen in the Field Museum collection. 

 t'o.. Specimens examined from Wisconsin: 

 Sayner, 2; Rummeles (skull), i; (S. C.) Marshfield, Wood Co., i; 



Clark Co., i; (O.) Woodruff, Vilas Co., 2; Oconto Co., 1 = 8. 



Area of intergradation 



Map illustrating approximate range of the Canada Porcupine (Erethizon dorsatum) in eastern 

 United States and Canada. 



Suborder DUPLICIDENTATA. 



This suborder comprises two families, the Leporidce or true Hares 

 and Rabbits; and the Ochotonidce containing Picas or Tailless Hares 

 sometimes called Chief Hares — small animals inhabiting mountain 

 regions, several species of which occur in western North America but 

 not within our limits. The members of the suborder are characterized 

 by having two pairs of permanent upper incisors,* the inner ones very 

 small and placed directly behind the others ; the enamel of the incisors 

 is continuous and not confined to the front of the teeth; the tibia and 

 fibula are united, being anchylosed below; clavicles are present (com- 

 plete in OchotonidcB but incomplete in Leporidce); incisive foramina 

 of the palate large and usually confluent; bony palate short, being 

 reduced to a narrow bridge between the premolars; postorbital proc- 

 esses very large in Leporidce but absent in Ochotonidce; testes external. 



* At birth there are three pairs but the outer one on each side is soon lost. 



