LIST OF FIGURES IN THE TEXT. 



VOLUME IV. PART I. 



FIG. PAGE. 



I. Chironectes minimus 3 



1 1 . Marmosa cinerea 7 



III. Caluromys derbianus 10 



IV. Mctachirus fuscogriseus 12 



V. Didelphys mesamericana 15 



VI. Choloepus hoffmanni 21 



VII. Bradypus castaneiceps 23 



VIII. Cyclopes dorsalis 26 



IX. Tamandua tetradactyla, adult 28 



X. Tamandua tetradactyla, young 28 



XI. Myrmecophaga tridactyla 30 



XII. Cabassous centralis 31 



XIII. Tatu novemcinctum 34 



XIV. Trichechus manatus 36 



XV. Baleen Whale attacked by Killer Whales 40 



XVI. Physeter macrocephalus 45 



XVII. Phocaena phocaena 49 



XVIII. Orcinus orca 50 



XIX. Globicephalus melas 53 



XX. Tursiops truncatus 56 



XXI. Prodelphinus plagiodon 57 



XXII. Tagassu pecari 65 



XXIII. Odontococlus a. couesi 71 



XXIV. Mazama sartori 79 



XXV. Antilocapra a. mexicana 81 



XXVI. Ovis c. cremnobates, Old Ram 84 



XXVII. Ovis c. cremnobates, Old Ewe and Young Ram 85 



XXVIII. Tapirella dowi 88 



XXIX. Sciurus aureigaster 115 



, XXX. Tamias obscurus 135 



XXXI. Citellus (Otospermophilus) variegatus 149 



XXXII. Cynomys ludovicianus 155 



XXXIII. Sciuropterus volans 158 



XXXIV. Castor c. frondator 161 



XXXV. Mus rattus 164 



XXXVI. Onychomys torridus 167 



XXXVII. Peromyscus 1. sonoriensis 182 



XXXVIII. Sigmodon h. inexoratus 229 



XXXIX. Oryzomys molestus 240 



XL. Zygodontomys cherrii 253 



XLI. Rhithrodontomys megalotis 260 



XLII. Acodon teguina 274 



XLIII. Neotoma micropus 281 



XLIV. Hodomys alleni 297 



xix 



