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 reéntrant 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 Rats. 
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 
brewed blac: -.. os Aes 5 Se el N. jfuscipes 278 
Tail brownish black above, pale 
brown beneath; upper parts reddish 
Brow ana piack..2< vee oF scien ood N.f. macrotis 279 
b.” Tail bicolor. 
a./’’ Above pale Vandyke brown.......... N. torquata 279 
b.’”” Above grayish fulvous and black....N.cumulator 280 
Bemecindern parts Gar SIAKC . .. ong op cree Fem d N. bryantt 280 
b. Size medium or small. 
a.’ Under parts white. Tail bicolor. 
a.” Above rusty red and black............J NV. ferruginea 280 
b.’’ Above grayish lead color and dark 
PRISCA Bote 2a neon be ee ote RR oe ol N.micropus 281 
c.’’ Above ochraceous buff and black. , 
PRM ret a ae cit, > este ee oes paced N. leucodon 281 
Uae Mrirlhens Patek Gao ee acre cutee esa. < ede N. latifrons 282 
d.’’ Above pale yellowish brown and dark 
TaReIVREE ee a As 9e ae eidae Bea ee ted N.mexicana 282 
e.’’ Above buffy ochraceous and black.........1 N.navus 282 
f.’’ Above dark fulvous brown and black.....N.sinaloe 283 
g./’ Above grayish brown and black, tinged 
with fulvous. 
a.’’’ Hairs on middle of body beneath 
WAM EOOLS ac oe cer we ao eee AV OPEN aced 283 
