74 ' -RANIDA. 
Polypedates, Tschudi, Batr. p. 34; Dum. & Bibr. p. 515; Giinth. 
Cat. p. 77 ; Cope, 1. c. 
Boophis, T'schudi, l. ¢. p. 86. 
Biirgeria, Tschudi, 1. ec. p. 75. 
Hypsiboas, sp., Wagler, Syst. Amph. p. 200. 
Pupil horizontal. Tongue free and deeply notched behind. 
Vomerine teeth. Tympanum generally distinct. Fingers and toes 
more or less webbed, the tips dilated into regular disks. Outer 
metatarsals separated by web. Omosternum and sternum with a 
bony style. ‘Terminal phalanges generally bifurcate, sometimes 
obtuse. 
East Indies; Japan; Madagascar. 
The recent discovery of several remarkable forms has much 
affected the old division of the species into two genera, Polypedates 
and Fhacophorus, which was based on the development of the 
interdigital web. Without further entering upon this question, IT 
may observe that two species which differ much in the extent of the 
web between the fingers, viz. Polypedates schlegelia and Rhacophorus 
maximus, resemble each other so much in all other respects that they 
must be considered closely allied forms. As tothe arrangement pro- 
posed by Mr. Cope, viz. to place the species with undivided terminal 
phalanges in the genus Jwalus, I think that such a division would be 
very unnatural, as it would lead us to separate generically R. micro- 
tympanum from R, pleurostictus. 
Synopsis of the Species. 
I. Fingers not more than half webbed. 
A. Heel without dermal appendage. 
1. Vomerine teeth extending backwards beyond the level of 
the hinder edge of the choanee. 
Vomerine teeth in a straight line; fingers 
nearly one-third webbed; tympanum at 
least two thirds the size of the eye ...... 1. goudoti, p. 76. 
Vomerine teeth in two oblique groups ; fingers 
very slightly webbed; disks as large as 
Raa SAUL TATA Paes hel oe eae say ale eee 3. crossleyi, p. 77. 
Tympanum half the size of the eye; disks as 
large as tympamUM = ..35...2..+2seeee 2. dispar, p. 77. 
2. Vomerine teeth between the choane. 
a. Fingers not more than one-third webbed. 
a. Tympanum hidden .......... 8. surdus, p. 79. 
3. Tympanum distinct, more than half the width of the 
eye. 
A glandular lateral fold.......0..,.0000- 6. hecticus, p. 78. 
