436 BATRACHIA. 



Hyla chinensis. 



Hyla arborea, var. chinensis, Giinth. Batrach. Sal. p. 108. pi. 9. fig. C. 



This frog is extremely similar to our common European Tree-frog ; however, as a structural 

 difference is always combined with a second, of coloration, it may be entitled to specific 

 distinction, and the more so as it appears to be peculiar to China. 



The general form of the head and body is the same as in H. arborea, the head being 

 perhaps comparatively a little smaller than in that species. The length of the body is more 

 than the distance between vent and heel. The tympanum is one-third the size of the eye ; 

 the vomerine teeth are placed in two small groups between the hinder part of the choanae. 

 A distinct fold across the chest. There is a short but distinct web between the fingers, and 

 the web between the toes does not quite extend to the disks of the third and fifth toes. The 

 back is uniform green, the lower parts white ; several round or ovate black spots on the side 

 of the body, in the loin, and on the hinder surface of the thighs ; a broadish blackish band 

 runs from the tympanum, through the eye, below the canthus rostralis, to the end of the 

 snout. 



This species is found in Southern China and on the island of Formosa, where it has been 

 collected by Mr. Swinhoe*. It attains to the same size as H. arborea, the length of its body 

 being 18 lines, and that of its hind limb 27 lines. 



CALLULA. 



Kaloula, Gray. 



Head rather small, with short snout ; body short, depressed ; limbs short ; 

 cleft of the mouth narrow ; eye rather small. Teeth none ; a sharp osseous 

 transverse ridge behind the choanae ; a fold of the mucous membrane runs 

 across the palate, another further behind, before the oesophagus. Tongue 

 free and entire behind. Openings of the eustachian tubes narrow ; tym- 

 panum indistinct or hidden. Skin smooth, or with a few flat tubercles ; no 

 large glands. Males with a simple vocal sac, which opens by a pair of slits 

 on the middle of the side of the tongue. 



We are acquainted with four species of this genus, two of which belong to the fauna of 

 the Archipelago j", and two to that of the continent and Ceylon. 



* The Chusan Tree-frog perhaps belongs also to this species ; Cantor enumerates it as Hyla arborea ; 

 but we have received an example from the East India Collection, which appears to have been sent by 

 Cantor, although, imfortnnately, the label has been lost. This specimen is a H. chinensis. 



t Namely, Callula baleata and C. picta. The latter species, from the Philippine Islands, deserves par- 



