vi HYLIDAE 189 



are black. The sides of the body are adorned with a black, 

 white-edged streak, the limbs are whitish, with black cross-bars. 

 The total length of the female type-specimen is 3 inches. 



Sub-Fam. 2. Hylinae. Lower jaw toothless. 



The Hylinae are divided by Boulenger into 13 genera, which 

 can be recognised by the following key, without reference to- 

 their natural affinities : 



A. The contracted pupil forms a horizontal slit. 



a. Tips of the fingers and toes with large discs. 

 a. With vomerine teeth. 



Female without a dorsal pouch . Hyla, p. 189. 

 Female with a dorsal pouch . . Nototrema, p. 202. 

 j3. Without vomerine teeth . . . Hylella, p. 203. 

 y. With parasphenoid teeth and peculiar 



helmet-shaped head. Yucatan . Triprion, p. 207. 

 Ecuador and Mexico . Diaglena, p. 207. 

 6. Tips with very small discs. Tongue free behind. 

 Tympanum distinct. North America 



and Peru ..... Chorophilus, p. 208. 



Tympanum indistinct. North America Acris gryllus, 



p. 207. 

 c. Tips simply swollen, not dilated into discs. 



Brazil ....... Thoropa miliaris, 



p. 209. 



B. The contracted pupil forms a vertical slit. Tropical America. 



a. Tips with large discs. 



a. Tongue extensively free behind. 



Inner finger and toe opposable . Phyllomedusa, p. 203. 



Inner finger and toe not opposable . Ayalychnis, p. 206. 

 P. Tongue scarcely free behind. Ecuador Nyctimantis rugiceps^ 



p. 206. 

 6. Tips without discs. Without parasphenoid 



teeth, but head peculiar in shape. Mexico Pternohyla fodiens, 



p. 207. 



C. Pupil rhomboid. Without parasphenoid teeth. 



Large discs. Head helmet-shaped. Brazil . Corythomantis green- 



ingi, p. 207. 



Hyla. The pupil is horizontal. The tympanum is distinct or 

 hidden. The tongue is entire or slightly nicked in its hinder 

 margin, which is more or less free behind. The fingers and toes 

 are provided with typical adhesive discs. 



This is the largest genus of all Amphibia, containing about 

 150 species, and its distribution coincides with that of the whole 

 family. Many of the species are very closely allied to each 



