LIST OF ILLUSTEATIONS. XV 



fage. 

 Fig. 102. — Peromyscus eremicus fraterculus. Skulls, a, Type of Sitomys 



herronii Rhoads; b, type of Sitomys herronii nigellus Rhoads . . 436 

 103. — Peromyscus eremicus fraterculus. Crowns of molar teeth. Type 



of Sitomys herronii Rhoads. a, Lower series; b, upper series 437 



104. — Peromyscus eremicus anthonyi. Dorsal view of skull 439 



105. — Peromyscus merriami. Skull, a, Dorsal view; b, ventral view; 



c, lateral view 443 



106. — Peromyscus merriami. Crowns of molar teeth, a, Lower series; 



b, upper series 444 



107. — Peromyscus tiburonensis. Skull, o, Dorsal view: 6, ventral view; 



c, lateral view 445 



108. — Peromyscus tiburonensis. Crowns of molar teeth, o, Lower series; 



b, upper series 445 



109. — Sigmodon hispidus arizonse. a, Ear; b, forefoot; c, hindfoot; 



d, tail 446 



110. — Sigmodon minimus. Skull, a, Dorsal view; b, ventral view; 



c, lateral view 447 



111. — Sigmodon hispidus berlandieri. Crown of molar teeth, a, Upper 



series ; b, lower series - 450 



112. — Sigmodon hispidus arizonpe. Skull of type, a, Dorsal view; 



b, ventral view ; c, lateral view- 451 



113. — Sigmodon hispidus eremicus. Skull of type, a, Dorsal view; 



b, ventral view ; c, lateral view 452 



114. — Reithrodontomys megalotis. Skull, a, Dorsal view^; b, ventral 



view; c, lateral view 461 



115. — Reithrodontomys megalotis deserti. a, Hindfoot; 6, forefoot, 



c, tail; d, outer lateral view of lower molars; e, same of upper 

 molars; /, crowns of upper molars; g, crowns of lower molars; 



/(, lower incisors; /, upper incisors 462 



116. — Reithrodontomys longicauda. Skull, a, Dorsal view; b, ventral 



view ; c, lateral view 465 



117. — Neotoma cumulator. Skull of type, a, Dorsal view; b, ventral 



view ; c, lateral view 474 



118. — Neotoma cumulator. Crowns of molar teeth of type, a, Upi^er 



series; b, lower series 474 



119. — Neotoma intermedia. Crowns of molar teeth of a young individual. 



a, Upper series; b, lower series 485 



120. — Neotoma fuscipes macrotis. «, Ear; 6, forefoot; e, hindfoot; d, tail. 488 

 121. — Neotoma pinetorum. Skull, a, Dorsal view; b, ventral view; c, 



lateral view 490 



122. — Neotoma pinetorum. Crowns of molar teeth, a, Upper series; b, 



lower series 490 



123. — Feet of Fiber zibethicus. a, Forefoot; b, hindfoot 495 



124. — ;Tail of Fiber zibethicus. a, Lateral view; b, dorsal view 496 



125. — Microtus californicus. Skull, a, Dorsal view; b, ventral view; c, 



lateral view 499 



126. — Microtus californicus. Crowns of molar teeth. «, Upper series; b, 



lower series 499 



