EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1 — Vespertilio paUidua^ Lee. — 1045. — San Ellzario, Texas. 



1. a — side view of the head. 



Fig. 2 — Macrotus calif oriiicus ^ Baird. — Fort Yuma. , 



2, a — side view of the head ; 2. h — bac*k view of do., showing the merahrane con- 

 necting the ears. 



PLATE II. 



Fig. 1 — Felis eyra^ Desm. — Matamoras. — Reduced from a drawing by Dr. Cerlandier. 



Fig. 2 — Putorius frenatus^ And. Bach. — Matamoras. — Young animal, before shedding its 



milk teeth. From an alcoholic specimen. 

 2. a — side view of the head ; 2. h — roof of the mouth, showing the ridges of the 



palate ; 2. c — under view of the fore foot ; 2. d — under view of the hind foot, 



showing the naked turbercles. 



PLATE III. 



Fig. 1 — Diddphys calif omicay Bennett. — Fig. 1, adult, No, 138. — Fig. 2, young, No. 199. 



PLATE IV 



Sciurtis UmittSy Baird. — Devil's river, Texas. 



PLATE V. 



Sciurus castanonoius y Baird. — Copper Mines. 



PLATE VI. 



Fig. 1 — Tamias dorsaliSy Baird. — Copper Mines. 



1. a — hairs of the tail separate, to show the annulation 



Fig. 2 — Sigmodon herlandleriy Baird. — Adult. — Rio Nasas, Coahuila, Mexico 



m 



