96 reptilt:?!. 



fii'st and third longest, nearly equal in length ; the second rather 

 longer than the fourth. Toes quite free, Avith a very slight fold at 

 the edges ; fourth longest by far ; third rather longer than fifth ; 

 metatarsus with two small blunt tubercles. Skin granulated, with 

 symmetrical longitudinal folds on the back ; a prominent glandular 

 fold from the back edge of eye above the tympanum to the arm-pit ; 

 tongue elongate, heart-shaped, free and deeply notched behind ; 

 interior nostiils and eustachian tubes rather small ; vomerine teeth 

 in two rather elongate and oblique groups, somewhat behind the 

 level of the hinder edge of the nostrils. Above brownish or olive ; 

 back irregularly variegated with darker ; between the eyes a blackish 

 spot, in front of which a lighter one ; sides of head beneath the 

 canthus rostralis and the glandular fold blackish ; extremities with 

 darker cross-bands ; hinder side of the thighs dark brown ; under 

 parts dull yellowish ; throat speckled with brown. Length of body 

 1|-" ; length of front extremity 1 i" ; length of hinder extremity 3". 



Fam. 3. HYLID^. 



HiLTNA with webbed toes, dilated processes of sacral vertebra, 

 and without paratoids. 



Synopsis of the Genera. 



1. Litoria. First finger opposite to the three others. Australia. 



2. Pseudacris. Toes slightly webbed at the base ; web wanting 



between the two inner toes. 



3. Hyla. Head covered with soft skin ; no finger opposite to the 



three others ; toes all webbed ; no pouch on the back of the 

 female. Cosmopolitan. 



4. Nototrema. Head covered with soft skin ; female with a pouch 



on the back. Central America. 



5. Notodelphys. Head above bony ; female with a pouch on the 



back. Peru; Mexico. 



6. Trachycephalus. Head above bony ; no pouch on the back of 



the female. West Indies ; South America. 



1. LITORIA. 



Vomerine teeth ; skin of back smooth, or with plaits ; disks very 

 small ; fingers very slightly webbed, the first opposite to the three 

 others ; toes half-webbed ; tympanum distinct ; eustachian tubes 

 small ; tongue broad, elliptic, entire or shghtly notched behind ; 

 males with a subgular vocal sac. Australia. 



Litoria *, Tsclmdi, Batr. p. 77 ; Dmn. ^- Bibr. viii. p. 503. 

 Pelodytes, sp., Gray, Zool. 3Iisc. p. 56. 



* Litoria glandulosa, Bell, Zool. of the Beagle, p. 42. pi. 18. f. 4, was founded 

 upoji a specimen, now in the Collection of the British Museum, from Concepcion 



