General Account of the Ithacan Anura. 



21 



So, in both the upper and the lower labium, the last row will be the first 

 to disappear or be reduced. 



The following table, which presents the total length of the tadpoles, 

 the length of their tails, the length and depth of their bodies, shows a 

 curious correlation : 



Strangely enough, the ascending scale is the same for all four characters. 

 For example, the toad tadpole is the smallest in all four particulars, as 

 the bullfrog tadpole is the largest. In addition, the order of size for the 

 tadpoles is identical with that for adults, if the toad be eliminated from 

 the consideration. 



Those who do not have dividers or lens at hand for relative measure- 

 ments or for examination of mouth-parts, may wish some easily recog- 

 nizable character for the determination of the forms. The coloration 

 or markings on the tail or some equally striking character may furnish 

 it. These have been italicized in the following synopsis of the tadpoles 

 of our eight species. 



