I. American genera.
A. The metasternum forms a cartilaginous plate without a narrow handle. The pupil contracts into a horizontal slit.
a. The terminal phalanges are bifurcated, Y-shaped, and provided with large discs; the tympanum is distinct; the omosternum is absent .......... Centrolene geckoideum, Ecuador.
b. The terminal phalanges are T-shaped and carry discs. The omosternum is cartilaginous.
α. Discs divided by a dorsal groove.
With vomerine teeth .......... Elosia, 3 species in Brazil.
Without vom"r teeth .......... Syrrhopus,[[91]] 9 species, South America.
β. Discs undivided.
With vomerine teeth .......... Hylodes, p. [214].
Without vom"r teeth .......... Hylopsis.