144 Catalogue of Reptiles inhabiting the 



From H. baleatus, Tschudi, the present species differs both in 

 colours and in the following particulars. The profile from the nose to 

 coccyx forms a considerable arch, the highest part of which is the 

 centre of the back. The male is provided with a vocal sac, the large 

 openings of which are situated on each side of the tongue, and their 

 presence is easily detected by the laxity of the (black) skin of the' 

 throat, which forms a broad transversal fold. Between the small open- 

 ings of the Eustachian tubes the palate presents a considerable trans- 

 versal fold of the skin, the free margin of which is fringed, which gives 

 it the appearance of a row of teeth. A similar fold has been observed 

 by M. M. Dumeril and Bibrou in the genera Plectrojws, Dum. and 

 Bibr., and in Uperodon, Dum. and Bibr. In front of this fold is ano- 

 ther smaller, between the orbital protuberances. Behind each of the 

 large internal openings of the nostrils, is an arched bony ridge, which 

 in H. baleatus supports a few teeth. In the only individual of the pre- 

 sent species examined, the free margin of the ridge is cutting, but 

 without teeth. Over the symphysis of the lower jaw there is a small 

 pointed process, fitting into a corresponding cavity in the margin of 

 the upper jaw. In this species no less than in Uperodon marmoratum, 

 Dum. and Bibr. nearly the whole of the thigh is hidden by the skin 

 of the body, so that the posterior extremities are free but from a little 

 above the knees. This character does not appear to exist in Hylee- 

 dactylus baleatus, as it is not mentioned in the description of that 

 species by M. M. Dumeril and Bibron. On the anterior part of the 

 back appear some indistinct rounded elevations ; the rest of the upper 

 parts is smooth. The skin of the throat and abdomen presents num- 

 erous transversal wrinkles, and is covered with minute tubercles. The 

 toes are more slender than the fingers, and their last joint, although 

 flattened, is not so broad, as that of the fingers, which is of a somewhat 

 triangular form, truncated in front. In //. baleatus the fingers are 

 longer than the toes. In the present species however the longest 

 finger, the third, is nearly one-fourth shorter than the fourth toe. 



The only individual which I had an opportunity of examining, after 

 its death, was a male taken in a field near Malacca. It was of the 

 following dimensions : 



Length of the head, Of inch. 



Ditto ditto trunk, 2| 



