338 



BULLETTI^ 120, UNITED STATES NATIONAL MUSEUM. 



Cepedea dimidiata [paraguensis] is a puzzle, for it is found in 

 southern South America in a Hyla. Only one other Cepedea is 

 known from South America, this in a Brazilian Hi/la. The other 

 four Hylidae which are known to bear Cepedea live in Central 



America and Texas, and their Cepedeas, or their ancestors, probably 

 were brought from Asia by way of Alaska and western North 

 America, or may possibly have come from Africa to tropical America. 

 Only three Anura from tropical Africa are now known to bear 

 Cepedea; these are a Bufo, a Phrynomantis (Gastrophrynidae) and 

 a Hyperolim (Ranidae). We shall see that Bufo seemingly entered 



