NEOTOMA. 277 



that of squamosal joining it at almost a right angle. Mandible with 

 long, acute, coronoid process, higher than condyle; roots of lower 

 incisors causing protuberances on each side of the jaw; upper molar 

 teeth with usually one internal and two external reentrant loops; 

 first and second lower molars with two external and two internal 

 loops; last molar with only one of each; upper molars three-rooted; 

 lower with but two roots. 



A. Neotoma. Naked-tailed Wood Eats. 

 Tail long, naked, round. 



KEY TO SPECIES AND SUBSPECIES. 



A. Tail naked, scaly, round. 



a. Size large. 



a/ Under parts whitish or yellowish white. 



a." Tail unicolor. PAGE 



a/" Tail all black; upper parts mummy 



brown and brownish black N. distincta 278 



b.'" Tail all dusky; upper parts reddish 



brown and black N. fusctpes 278 



Tail brownish black above, pale 

 brown beneath ; upper parts reddish 



brown and black N. f. macrotis 279 



b." Tail bicolor. 



a/" Above pale Vandyke brown A7. torquata 279 



b/" Above grayish fulvous and black. . . .N. cumulator 280 

 b/ Under parts dark slate N. bryanti 280 



b. Size medium or small. 



a/ Under parts white. Tail bicolor. 



a." Above rusty red and black .V. ferruginea 280 



b." Above grayish lead color and dark 



brown N. micropus 281 



c." Above ochraceous buff and black. 



a.'" Large N. Icucodon 281 



b/" Small N. latifrons 282 



d." Above pale yellowish brown and dark 



brown N. mexicana 282 



e." Above buffy ochraceous and black .V. navus 282 



f." Above dark fulvous brown and black N. sinaloa 283 



g." Above grayish brown and black, tinged 



with fulvous, 

 a.'" Hairs on middle of body beneath 



white to roots. . N. arenacea 283 



