OF THE BATRACHTA. 109 



The two Subregions into which 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, AmpJiiumidce, 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. 



FlRMiSTERNlA. Number of Species. 



Ranidce. 



Rana 15 



Engystomatidce. 



Engystoma 1 



Arcifera. 



Cyrtignathidce. 

 Hylodes 1 



Bufonidce. 

 Bufo 7 



Hylidce. 



Chorophilus 7 



Acris * 1 



Hyla 13 



Pelobatidce. 



Scaphiopus * 8 



CAUDATA. 



Scdamandridce. 



Scdamandrince. 



Molge 2 



AmbJystomatince. 



Dicamptodon * . . .• 1 



Amblystoma 16 



Plethodontince. 



Anaides * 2 



Plethodon * 6 



Batrachoseps * 4 



Spelerpes 12 



Manculus * 2 



Desmoyn ath ince* 



Desmognatlms * 3 



Thorius * 1 



Amphium idee. 



Cryptobranehus* 1 



Amphiuma * 2 



Proteidce. 



Necturus * 1 



Sirenidce *. 



Siren* 1 



Pseudobranchus * 1 



