CACOPUS SYSTOMA. 415 



Eye of moderate size, prominent ; upper eyelid with a sharp edge. Tympanum rather small, 

 one-third as large as the eye. A linear fold runs from the hinder edge of the orbit over the 

 tympanum towards the armpit. Cleft of the mouth nearly twice as broad as long ; tongue 

 large, not notched behind, only a small part of it being unattached to the gullet. There 

 is a short, oblong prominence on each side of the vomer ; it commences on a level with the 

 hinder angle of the choanee and runs backwards in a straight line ; it does not appear to 

 bear any teeth, although these may be conspicuous in other specimens. The skin is per- 

 fectly smooth, but there is a linear Y-like fold on the nape, the angle being du'ected back- 

 wards. Limbs of moderate length, the length of the body being rather more than the 

 distance of the vent from the heel. The third finger is considerably longer than the others, 

 which are subequal. Metatarsus without tubercle ; the fourth toe is not quite half as long 

 as the body ; the third is a little longer than the fifth. 



Upper parts brownish olive ; a triangular dark spot on the crown of the head ; a brown 

 spot below the eye, and a brown band along and below the supratympanal fold. Lower 

 parts marbled with brown ; fingers with brown rings. 



I have examined two examples, from Sikkim and from Khasya. They are 19 lines long, 

 the hind limb being 31 Imes long. 



CACOPUS, Gthr. 



Uperodon*, Dum. ^ Bibr. 



Head very short ; mouth small ; limbs short. A series of four papillae 

 across the palate : one on the hind margin of each choana, and two on a 

 pair of osseous prominences of the vomer. Tongue circular, scarcely 

 notched behind. Tympanum hidden ; openings of the eustachian tubes of 

 moderate width. Toes slightly webbed ; metatarsus with a pair of large 

 compressed prominences. Male with a vocal sac. 



Two species are known : — 



Snout extremely short, without canthus rostralis C. systoma. 



Snout short, with an obtuse canthus rostralis C. globulosus. 



CACOPUafSTSTOMA . 



Rana systoma, Schneid. Hist. Amph. i. p. 144. Peters, Monatsber. Berl. Acad. 1863, p. 82. 



Engystoma marmoratum, Cuv. Regne Anim. 



Uperodon marmoratiun, Dum. ^ Bibr. viii. p. 749. GUnth. Batr. Sal. p. 49. 



Head very short, with the occipital region swollen, globular ; snout extremely short, with- 



* The correct spelling of this word would be Hyperodon, a name long previously given to a genus of 

 Cetaceans, Besides, these frogs have no vomerine teeth. 



