\ 



58 



EXPLANATION OF TLATES. 



PLATE VII. 



Fig. 2—Sp 



Spermoj)7dlus grammuruSf Bach. — (perhaps S. macrums.) — Details from a specinicn in alco- 

 hol. No. 1046. — Los Nogales. 

 1 ^ a — view of head from the front ; 1. &— do. from the side ; 1. c— do. from heneath ; 



1. d — under view of fore foot ; 1. e — do. of hind foot. 

 rmophilus tereticauda^ Baird. — No. 1584. — Fort Yuma. 



2. a — head from the side ; 2. b — do. from before ; 2. c — under view of fore foot ; 



2. d- — do. of hind foot- 

 Fig. 3 — SpermopMlus spilosoma^ Bennett. — No. 1042. — Janos. 



3. a — head from the side ; 3. h — do. from before ; 3. c — do. from beneath ; 3. d 

 under view of fore foot ; 3. e — do. of hind foot. 



Fig. 4 — Beifhrodon. — Janos to San Luis Spring, New Mexico. 



4. a— ear ; 4. 5 — under surface of fore foot j 4. c— do. of hind foot; the last two 



magnified three diameters. 



PLATE VIII. 



Thomomys umhrinuSj Baird, — No. 154. — Copper Mines. 



a — under surface of left fore foot ; b — its longest claw from the side ; c — do. from 

 below ; d — under surface of hind foot. 



PLATE IX. 



Fig. 1 — Geomys darlcii, Baird. — No. 6. — Presidio del Norte. 



I 



1. a — under surface of left fore foot; 1. h — side view of its longest claw; 1. c 

 under view of do. ; 1. d — under surface of left hind foot. 

 Fig. 2-~Perognathus hispidus, Baird.— No. 577.. Charco Escondido, 

 Fig. 3 — Bipodomys ordii. Woodhouse.— Coahuila. — From alcohol. 



Mex. — From alcohol. 



PLATE X. 



Fig. 1 — Thomomys umhnnus Baird? — No. 1036. — Espia. 



1. a— side view of head ; 1. 6— under view of do., showing the openings of the 

 pouches ; 1 . c 



foreshortened ;) 1. d — do 



(the metacarpal portion much 



Fig. 2 — Sigmodon herlandierij Baird.— No. 1034.— Los Nogales. 



2. a— side view of head, showing the ear ; 2. 6— under view of the muzzle ; 2. < 

 under view of the left fore foot ; 2. d— side view of its longest claw ; 2. e— under 

 view of left hind foot ; /—side view of the longest claw. 



N. B. The engraver has neglected to represent the hairs under the nostrils. 

 Fig. 3—Neotoma mexicana, Baird.— No. 1033.— San Pedro, Sonora. 



3. a— side view of the head ; 3. 5— muzzle from beneath ; 3. c— under surface of 

 left fore foot ; 3. d—iis longest toe and claw ; 3. e— under surface of hind foot ; 

 3. /—its longest toe and claw. 



