300 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



union of the middle portion of South America with Australia is 

 somewhat more problematic, but seems to be indicated by the pres- 

 ence of Hylidae in all tropical America and in Australia and Papua 

 (fig. 227). The absence of Hylidae from southernmost South Amer- 



ica today seems to preclude their passage from one hemisphere to tht 

 other by the Antarctic route. A trans-Pacific migration seems to 

 be indicated, but its exact route, of course, can not be determined. 

 No Hylidae, or other Anura, are Imown from any of the mid-Pacific 



