238 . CYSTIGNATHID^. 



dilated at the tips. Outer metatarsals united. Omosternum carti- 

 laginous ; sternum with a bony style. Terminal phalanges simple. 

 Tropical America. 



Sternal apparatus of Leptodactylus pentadactylus. 



Synojms of the Species. 



I. Toes -without distinct dermal margins. 



1, Tongue regularly heart-shaped. 



Tympanum half the width of the eye . 1. pustulatas, p. 239. 



Tympanum two thirds the width of the 

 eye ; tibio-tarsal articulation not reach- 

 ing the eye 2. rJiodonotus, p. 239. 



2. Tongue oval or elliptic, entire or slightly nicked behind. 



A. Tips of toes dilated into small but distinct disks. - 

 Tibio-tarsal articulation reaching the eye 3. hylcedactylus, p. 240. 



B. Tips of toes not dilated. 



a. Tibio-tarsal articulation reaching the tip of the snout. 



Tympanum two thirds the width of the 



eye ; vomerine teeth in two slightly 



arched series 4. longirostris, p. 240. 



Tympanum two thirds the width of the 



eye ; vomerine teeth in a long scarcely 



interrupted series 5. gracUis, p. 241. 



Tympanum nearl}^ as large as the eye ; 



vomerine teeth in two arched series . . 6, fragilis, p. 241. 

 Two glandular folds on eacli side of the 



back, the latter ending in a large flat 



gland on the groin 7. lahrosm, p. 241. 



