_Mammalia._--The following genera are not found in any other part of the Nearctic region. _Macrotus_ (Phyllostomidæ), one species in California; _Antrozous_ (Vespertilionidæ), one species on the West Coast; _Urotrichus_ (Talpidæ) one species in British Columbia; sub-genus _Nesorex_ (Soricidæ), one species in Oregon; _Bassaris_ (Procyonidæ), California; _Enhydra_ (Mustelidæ), Pacific Coast; _Morunga_ (Phocidæ), California; _Haploodon_ (Haploodontidæ) a rat-like animal, allied to the beavers and marmots, and constituting a peculiar family found only in California and British Columbia. The following characteristic Nearctic forms also extend into this sub-region:--_Taxidea_, _Procyon_, _Didelphys_, _Sciuropterus_, _Tamias_, _Spermophilus_, _Dipodomys_, _Perognathus_, _Jaculus_. _Birds._--Few genera of birds are quite peculiar to this sub-region, since most of the Western forms extend into the central district, yet it has a few. _Glaucidium_, a genus of Owls, is confined {128}(in the Nearctic region) to California; _Chamæa_, a singular form allied to the wrens, and forming a distinct family, is quite peculiar; _Geococcyx_, a Neotropical form of cuckoo, extends to California and Southern Texas. The following genera are very characteristic of the sub-region, and some of them almost confined to it: _Myiadestes_ (Sylviidæ); _Psaltriparus_ (Paridæ); _Cyanocitta_, _Picicorvus_ (Corvidæ); _Hesperiphona_, _Peucæa_, _Chondestes_ (Fringillidæ); _Selasphorus_, _Atthis_ (Trochilidæ); _Columba_, _Melopelia_ (Columbidæ); _Oreortyx_ (Tetraonidæ). _Reptiles._--The following genera are not found in any other part of the Nearctic region: _Charina_ (Tortricidæ); _Lichanotus_ (Pythonidæ); _Gerrhonotus_ (Zonuridæ); _Phyllodactylus_ (Geckotidæ); _Anolius_ and _Tropidolepis_ (Iguanidæ). _Sceloporus_ (Iguanidæ) is only found elsewhere in Florida. All the larger North American groups of lizards and snakes are also represented here; but in tortoises it is deficient, owing to the absence of lakes and large rivers. _Amphibia._--California possesses two genera of Salamandridæ, _Aneides_ and _Heredia_, which do not extend to the other sub-regions. _Fresh-water Fish._--There are two or three peculiar genera of Cyprinidæ, but the sub-region is comparatively poor in this group.