160 
ZOOLOGICAL LITERATURE. 
Mr. Cope has given a synopsis of the genera of his family 
Hylidce, whichj according to hiin^ comprises, besides Hyla and 
tlie genera allied to it, also Acris (Proc. Acad. Nat. Sc. Philad. 
1865, p. 194) 
I. No fronto-parietal fontanelle. 
a, Cranium above connate with a dernio-ossification ; prefrontals in 
contact. 
A series of parasplienoid teeth j no dorsal pouch .... Tharijngodon. 
No parasphenoid teeth; no dorsal pouch 2'rachycephalus. 
No parasphenoids ; a dorsal dermal pouch Opisthodelphys, 
/3. No cranial dermo-ossification. 
a. A dorsal dermal pouch. 
Toes slightly webbed Nototrema. 
&. No dorsal pouch. 
aa. Prefrontals united by suture. 
Two longitudinal cranial carinoe ; no gland Osteoccphalns. 
No carinse ; a parotoid covering head and back .... Scy topis. 
No carinae or parotoid ; prefrontals large Acrodytes. 
bb. Prefrontals small, separated by ethmoid. 
No keels or glands; ? a coccygeal diapophysis Dryomelictes, g. n.* 
II. A fronto-parietal fontanelle. 
a. Posterior digits free, opposable, two and three. 
Parotoid glands present ; tongue elongate, free Phyllomedusa. 
/3. Posterior digits on same plane, not opposable. - 
a. Posterior digits webbed, prefrontals separated by the largo etlimoid 
plate. 
aa. Brain-case and fontanelle broad; superior ethmoid plate broad; 
inner finger not opposite to the others. 
u». An elongate acuminate flat postorbital process of the fronto- 
parietal bone. 
Form stout Smilisca. 
/3]3. No postorbital process. 
Tongue elongate, extensively free ; inferior palpebra reticulate with white 
fibres ; vomerine teeth Ayalychnis. 
Tongue short, attached or little free ; palpebra usually transparent ; vome- 
rine teeth Hyla. 
Tongue short; palpebra transparent; no vomerine teeth. 
Hylella. 
Tongue extensively free ; dilatations minute, palmation extensive behind ; 
vomerine teeth Acris. 
bb. Brain-case and ethmoid elongate, fontanelle narrow; inner 
finger opposed to the others. 
Tongue slightly free Zitoria, 
b. Posterior digits free. 
Superior ethmoid plate osseous ; prefrontal bones separated.* 
Chorophilus, 
Superior ethmoid plate cartilaginous, the prefrontals developed, in contact 
medially Thoropa. 
* Type Hyla aurantiaca, 
