NO. 1874 NEW FROG FROM THE PHILIPPINES — STEJNEGER 439 



Rana magna is most nearly related to Rana macrodon, which was 

 originally described from Java, and has since been found in many 

 of the other Malayan islands as well as on the mainland. It is a 

 smaller species, however, and if we compare Philippine adult speci- 

 mens with specimens of the same size from Java and Sumatra, the 

 difference is indeed striking, because the latter, being so much 

 younger, have a correspondingly longer snout and narrower inter- 

 orbital space ; but the differences are less striking if we compare the 

 very largest western specimens with the oldest Philippine specimens — 

 for instance, the type — though they are numerous enough and obvi- 

 ous enough to demonstrate the distinctness of the latter. The most 

 important difference and the one which can be traced through all 

 stages is that in the size and location of the vomerine teeth series. 

 In R. macrodon these originate close to the inner anterior border 

 of the choange and extend very obliquely backwards, while in R. 

 magna they are separated from the choanae by a space almost as wide 

 as the latter; their position is less oblique, sometimes almost trans- 

 verse, and the series are also appreciably shorter. In addition, the 

 tympanum is considerably smaller, apparently never exceeding one- 

 half the diameter of the eye. The nostrils are also located more 

 apart than in R. macrodon, besides many minor and less easily 

 appreciated differences. 



