65 



Southern Neotropical realms. But one mammal (the cougar, Felis con- 

 color)^ and no reptiles, batrachians, nor fresh-water fishes, estend into 

 Brazil ; but a number of birds are permanent residents throughout both 

 realms. These are mostly waders, as follows : 



Rallus crepitans. 

 Limosa fedoa. 

 Tryngites rufescens. 

 Actiturus hartramius. 

 Heteroscelus hrevipes. 

 Symphemia semipalmata. 

 Ereunetes petrijicatus. 

 Aegialitis vilsonius. 

 Xyctlierodiiis violaceus. 



To these must be added the turkey-vulture, Cathartes aura. Then 

 certain marine birds and a few fishes extend along the coasts of both 

 regions, but their number is comparatively small. 



The number of species of the Nearctic realm which occur in the Mex- 

 ican region is rather greater. The red lynx and raccoon are examples 

 of mammals, and several species of wood- warblers, vireos, and hawks 

 represent the birds as far south as the Isthmus of Darien. The only 

 reptiles are the snapping-tortoise and the ringed snake OpMbolus dolia- 

 tKS ; the only batrachian is the Bana Jialecina herlandieri. A few other 

 species, as Eutaenia sirtalis, extend for a shorter distance into the same 

 region. 



In the higher groups of the ^enus and family, we have greater com- 

 munity with the Neotropical realm. But few genera of Batrachia and 

 Beptilia &s.t&xiA to its Brazilian region, but there are a few common 

 genera of Mammalia {Mephitis, Procyon, Ursus, Sciurus, Sesperomys, and 

 Didelphys), and a number of birds, especially among the lower orders, and 

 the scansores, syndactyli, and clamatores, particularly the Tyrannidae. 

 The number of genera which enter Mexico and Central America is much 

 greater, and I select the following from the mammals, reptiles, and 

 batrachianS; as these are incapable of the migrations performed by birds. 

 Cosmopolitan genera and those common to both the American realms 

 are omitted. 

 5 H 



