NORTH AMERICAN FAUNA, 



[no. 39'. 



/2. Color light, bright, or rusty ochraceous. 

 g^. Cfolor light or bright ochraceous. 



h}. Color bright ochraceous; skull heavy and angular, 



angularis (p. 53). 

 h"^. Color pale ochraceous; skull not heavy and angular, 



infrapallidus (p. 55). 



g^. Color rusty ochraceous. 



h^. Incisors heavy and not greatly projecting laticeps (p. 46). 



A^. Incisors slender and greatly projecting. 



i\ Hind foot of 30 to 33 leucodon (p. 47). 



{2. Hind foot of ^ 27 to 30 navus (p. 49). 



2. Incisors not projecting conspicuously beyond tip of nasals. 

 Color light ochraceous. 

 g^. Size large, hind foot of J* averaging about 32. 



h^. Bullae large; skull short and wide pascalis (p. 54). 



h^. Bullae small; skull long and narrow pallescens (p. 55). 



g^. Size smaller, hind foot of ^ averaging 30 or less. 



h^. Underparts buffy or whitish cabezonae (p. 76). 



h^. Underparts light ochraceous puertae (p. 58). 



/2. Color dark ochraceous, or ochraceous heavily clouded with black. 



g^. Size large, hind foot averaging 34 altivallis (p. 62). 



g^. Size medium or small. 

 h^. Size small, hind foot of ^ about 27. 



• i^. Skull narrow awahnee (p. 64). 



■i^. Skull wide mewa (p. 50). 



h^. Size medium, hind foot of 6" averaging 30-32. 



i^. Dorsal outline of skull arched, rostrum decurved. 

 f. Interpterygoid fossa wide, not sharply V-shaped, 



apache (p. 75). 



j^. Interpterygoid fossa narrow, sharply V-shaped. 



Throat usually white, interparietal large and quadrate, 



alpinus (p. 63). 



k^. Throat rarely white, interparietal small and often triangular. 



l^. Premaxillae wide alticolus (p. 60). * 



P. Premaxillae narrow. 



m^. Skull very long and narrow martirensis (p. 67). 



m^. Skull not very long and narrow nigricans (p. 56). 



<P. Dorsal outline of skull straight, rostrum not decurved. 

 f. Zygomatic arches widest posterior to middle; nasals emarginate, 



neglectus (p. 65). 



j.^ Zygomatic arches widest anterior to middle; nasals usually 



truncate jacinteus (p. 66). 



Color not strongly ochraceous. 

 Color tawny, varying from dark to bright and pale tawny. 



/.^ Size large, hind foot of averaging 31 or more. 

 g^. Color bright tawny. 



h^. Tail, feet, and belly well haired pervagus (p. 82). 



h^. Tail, feet, and belly very thinly haired. 



i^. Skull short and wide sinaloae (p. 80), 



i^. Skull long and relatively narrow anitae (p. 59). 



g^. Color dull tawny, bordering on buffy and fawn. 



¥. Hind foot of ^ averaging 34 or more cervinus (p. 79). 



h^. Hind foot of c? averaging about 31 or less. 



i^. Color dull tawny toltecus (p. 86). 



i"^. Color yellowish tawny baileyi (p. 87). 



