OF THE BATEACHIA. 109 



The two Subregions into ■whicli this Region is frequently divided 

 do not present the same marked distinctive features as the corre- 

 sponding Subregions of the Eastern Hemisphere; but we may- 

 notice that the small groups Sirenidce, Proteidce, Amphiumidce, and 

 Desmognathince are restricted to the Eastern Subregion, whilst all 

 other groups are distributed also in the Western. With one or two 

 exceptions the species are different. 



ECAUDATA. 



FlKMlSTBENIA, Number of SpecieB. 



Sanidce. 



Rana 16 



EngystomatidcB. 



Engystoma 1 



Abcifera. 



Cystignathidce. 

 Hylodes 1 



Bufonidee. 



Bufo 7 



Eylidcs. 



Chorophilus 7 



Aoris * < 1 



Hyla 13 



PelobatidcB. 



Scaphiopus * 8 



CAUDATA. 



Salamandrida. 



Salamandrincs. 



Molge 2 



Ambh/stomatiruz. 



Dicamptodon * 1 



Amblystoma 16 



Plethodontinie. 



Anaides * 2 



Plethodon * 6 



Batrachoseps * 4 



Spelerpes 12 



Maneulus * 2 



Desmognathince.* 



Desmognathus * 3 



Thorius * 1 



Am2yhiumidce. 



Oryptobraochus* 1 



Amphiuma * 2 



Proteidce. 



Necturus * 1 



Sirenidm *. 



Siren* 1 



Pseudobranchus * 1 



