330 HTLID^. 



Habit extremely stout. Head small ; mouth very narrow ; snout 

 long, truncated, forming a flat circular disk in front ; nostrils ver- 

 tical, nearly on a line with the front edge of the eyes ; eyes 

 very small. Limbs very short ; fingers and toes depressed, latter 

 nearly entirely webbed ; subarticular tubercles indistinct ; inner toe 

 tubercle-like ; a very large oval, shovel-like metatarsal tubercle. 

 Skin smooth above, granular on the sides and beneath and on the 

 snout. Olive-brown or bluish grey above, with or without yellowish 

 spots on the sides and on the middle of the back ; the latter some- 

 times confluent into a vertebral line. (Male with two lateral vocal 

 cavities, internal, and hidden behind the angle of the mouth. 

 —Othr.) 



Mexico. 



a. cJ . Mexico. M. SaU6 [0.]. 



6-e. 2 & yg' Mexico. 



d-e. Yg. Vera Oruz. M. Sall« [0.1. 



f-ff. Yg. S. America. M. Sall6 [0.]. 



8. HYLID^. 



Hylidee, Pelodryadidss, and Phyllomeduaidse, Ounth. Cat. Balr. Sal. 

 Hylidse, Cope, Nat. Hist. Mev. 1865, and Journ. Ac. Philad. (2) vi. 



1866. 

 Hylidse and PhyUomedusidse, Mwart, JPt-oc. Zool. Soc. 1869. 



Upper jaw toothed ; diapophyses of sacral vertebra dilated ; ter- 

 minal phalanges claw-shaped, swollen at the base. 



The sternal apparatus is much the same in all the members of 

 this family ; the omosternum and the sternum are always present 

 and cartilaginous. 



The vertebrae are procoelian and destitute of ribs. The coccyx is 

 attached to two condyles. 



Most of the species have a fronto-parietal fontanelle ; this is 

 absent in the adult state in several species of Hyla and in Noto- 

 trema ; in a few species of the former genus, in Nyctimantis, and 

 in Triprion the skin of the head is replaced by the rugose cranial 

 ossification. 



Thoropa, Chorophilus, and Acris, in which the diapophyses of 

 the sacral vertebra are slightly dilated, connect the Hylidce with 

 the Cystignathidce. 



Synopsis of the Genera. 



Pupil horizontal ; toes free, the tips very slightly dilated. 



1. Thoropa, p. 331. 



Pupil horizontal ; toes nearly free, the tips very slightly dilated ; 

 diapophyses of sacral vertebra very slightly dilated. 



2. Chorophilus, p. 332. 



