740 EXPLANATION OF THE PLATES. 



Fig 3 Putorius xanthogenys. Yellow-cheeked weasel. No. 536. San Francisco. 



Dried skin softened 176 



a ear. 



Fig. 4 Putorius cicognanii. Brown weasel. Boston 161 



a side of head. 



Fig. 5 Putorius frenatus. Brownsville, Texas. Half grown ; in alcohol 1*73 



a side of the head. 



Fig. 6 Putorius richardsonii, Bon. Illinois 164 



a side of the head. 

 Fig. 7 Luira canadensis, Sab. Otter. Washington, D. C. Dried skin softened ; 



(skin of feet too much stretched).. 184 



a side of head reduced one-half; b muzzle from helow ; c left fore foot 



from below ; d -left hind foot from below, (half size.) 

 Fig. 8 Lutra californica, Gray. California otter. Cascade Mountains. -Dried skin 



softened, (feet shrivelled.) e : * 187 



a muzzle from in front, (nat. size ;) b left fore foot from below ; c left 

 hind foot from below, (half size.) 



PLATE XX. 



Fig. 1 Sciurus douglassi, Bach. No. 1265. Upper des Chutes, Oregon Territory.- -* 



In alcohol * 275 



a side of the head ; b front view of head ; c under surface of left fore 



foot ; d under surface of left hind foot. 



Fig. 2 ? Tamias qnadrivittatus. Four-lined squirrel. No. 1266. Cascade Moun 

 tains, Oregon Territory; lat. 44. Alcoholic specimen 297 



a side of the head ; b front view of head ; c under surface of left fore 

 foot; d under surface of left hind foot. 



Fig. 3 Spermophilus later alls. No. 1272.- Upper des Chutes. In alcohol 312 



a side of the head ; b front view of head ; c under surface of left fore 



foot ; d under surface of left hind foot. 



Fig. 4 Aplodontia leporina, Rich. Sewellel. No. 966. Astoria. Dried skin soft 

 ened 353 



a front view of the muzzle ; b ear ; c under surface of left fore foot ; 

 d under surface of left hind foot. 



Fig. 5 Perognatus penicillatus, Woodhouse.-^San Francisco Mountains, N. M 418 



a ear ; b side view of tail, (from mounted specimen.) 



PLATE XXI. 



Fig. 1 Dipodomys ordii, Woodhouse. Monterey, Mexico. In alcohol 410 



a side view of head ; b under surface of head, with the jaw closed, show 

 ing the pouches and the hairy ante-chamber of the mouth ; c jaws open, 

 showing the interior of the mouth and the transverse ridges of the palate ; 

 d under surface of left fore foot ; e under surface of left hind foot ; / 

 lateral view of a hind toe and claw. 



