24 



2. H y 1 a Laur. 



(Laurenti, Synopsis Rept, Viennae, 1768, p. 32). 



Pupil horizontal. Tongue entire or slightly nicked, not or 

 little free behind. Lower jaw toothless; vomerine teeth usually 

 present. Tympanum distinct or hidden. Fingers free or webbed, 

 toes webbed, with disks. Outer metatarsals united or slightly 

 separated. 



Omosternum and sternum cartilaginous '). Diapophyses of 

 sacral vertebra dilated. 



Tadpoles. — Eyes lateral or superior. Spiraculum sinistral. 

 Vent median or dextral. Upper crest of tail usually extending 

 on to the body. Mouth normal, sometimes much enlarged; 

 series of papillae narrowly interrupted in the middle of the 

 upper lip, rarely absent; series of teeth 2/3. 



Distribution: the same as the family. 



■ Synopsis of the Species. 



A. Fingers webbed. 



I. The web reaches the disks of the second and 

 fourth fingers. 



1. The heel reaches beyond the tip of the snout. 



a. No outer metatarsal tubercle 



b. Outer metatarsal tubercle present. . . . 



2. The heel does not reach beyond the tip 

 of the snout. Vomerine teeth between the 

 choanae (or absent). 



a. Interorbital space twice the width of the 

 upper eyelid. Limbs cross-barred .... 



b. Interorbital space twice the width of the 

 upper eyelid. Limbs not cross-barred . 



c. Interorbital space as broad as the upper 

 eyelid. Limbs not cross-barred 



3. The heel does not reach the tip of the snout. 

 Vomerine teeth behind the level of the 

 choanae 6. H. eucnemis p. 3 



II. The web does not reach the disks of the fingers. 



1. No tympanum 7. H. obsoleta p. 32 



2. Tympanum present, its diameter less than 

 half that of eye. 



1. H. 7-hacophorus p. 28. 



2. H. atnboinensis p. 29. 



4- 



H. papuensis p. 30. 

 H. graminea p. 30. 



5. //. her nst cini p. 31. 



1) The omosternum is ossified in the males of H. infrafrcnata and milt (aria. 



