194 PROCEEDINGS OF THE ACADEMY OP 



It is interesting that an animal living in rocky situations should present 

 such a singular cranial bony development : this, in connection with its colors, 

 no doubt, aids especially in concealment, and is another instance of the Crea- 

 tor's bountiful care for his humblest creatures. 



It will be useful here to present a synopsis of the genera of Hylidae. 



I. No Frontoparietal fontanelle. 



a. Cranium above connate with a dermoossifica- 

 tion ; prefrontals in contact. 



A series of parasphenoid teeth ; no dorsal pouch Pharyngodon. 



No parasphenoid teeth ; ho dorsal pouch Trachycephalus. 



No parasphenoids, a dorsal dermal pouch Opisthodelphys. 



eta. No cranial derinoossification. 



/?. A dorsal dermal pouch. 

 Toes slightly webbed Nototrema. 



0/3. No dorsal pouch. 



y. Prefrontals united by suture. 



Two longitudinal cranial carina? ; no gland Osteocephalus. 



No carinae ; a parotoid covering head and back Scytopis. 



No carinse or parotoid; prefontals large Acrodytes. 



yy. Prefrontals small, separated by ethmoid. 

 No keels or glands ; ?a coccygeal diapopbysis Dryomelictes, g.n.* 



II. A frontoparietal fontanelle. 



a. Posterior digits free, opposable, two and three. 



Parotoid glands present ; tongue elongate free Phyllomedusa. 



m. Posterior digits on same plane not opposable. 

 (J. Posterior digits webbed, prefrontals separated 



by the large ethmoid plate. 

 y. Brain case and fontanelle broad ; superior eth- 

 moid plate broad ; inner finger not opposite to 

 the others, 

 ef. An elongate acuminate flat postorbital process 

 of the frontoparietal bone. 



Formstout Smilisca,f 9- >( 



cfef. No postorbital process. 

 Tongue elongate, extensively free ; inferior palpebra 



reticulate with white fibres : vomerine teeth Agalychnis. 



Tongue short, attached or little free ; palpebra usually 



transparent; vomerine teeth Hyla. 



Tongue short ; palpebra transparent ; no vomerine 



teeth Hylella. 



Tongue extensively free ; dilatations minute, palmation 



extensive behind ; vomerine teeth Acris. 



yy. Brain case and ethmoid elongate, fontanelle 

 narrow ; inner finger opposed to the others. 



Tongue slightly free Litoria. 



/?/?. Posterior digits free. 

 Superior ethmoid plate osseous ; prefrontal bones sepa- 

 rated Chorophilus. 



Superior ethmoid plate cartilaginous, the prefrontals 



developed, in contact medially Thoropa. 



Hyla gracilipes. 



Tonvue elongate, free one-third its length. Inferior palpebra not veined. 



* Type Hyla nurantiaca auctorum. 



t S d aulinia, sp. nov. This species I only know from a skeleton in the private anatomical 

 museum of llyrtl, Professor of Anatomy in the University of Vienna. The head is a little broader 

 than long; the interorbital width greater than from external nares to orbit ; vomerine teeth in 

 short transverse series; general form similar to the Acrodytes venulosus. 



[Oct. 



