HUTCH BORNEO-EXPEDITION. 199 



A third poiut iu which our specimen differs from the 

 typical one is in the arrangement of the submental shields. 

 Peters mentions one very large azygos submental, followed 

 by one pair of submentals meeting in the middle line, and 

 a second pair separated by one scale; but in the figure 

 he gives (3 b ) a scale is wedged in between the posterior 

 part of the submental shields of the first pair, and the 

 shields of the second pair do not touch one another but 

 are separated by three scales. Now, in our specimen the 

 submental shields of the first pair form a suture over 

 their whole length, whilst the shields of the second pair 

 form a suture over half the length, with a small triangular 

 scale wedging itself in between the posterior half of these 

 submentals. 



35. Tropidophorus iniquus, nov. spec. 



Another specimen of Tropidophorus, collected by Dr. 

 Nieuwenhuis in the neighbourhood of the upper part of 

 the Kajan river, measuring 96 mm. from snout to vent 

 and with a mutilated tail of 82 mm., differs still more than 

 the foregoing specimen from the description of Tropido- 

 phorus Beccarii. 



The coloration of the upperparts of this specimen rather 

 agrees with the coloration of our Howong-specimen, except 

 in the colour which is (probably by the action of the 

 formolaldehyd) dark grey in stead of brown. The under- 

 pays are white, without the vermiculations under the head ; 

 the posterior lower part of the tail and the soles of the 

 feet are of a dark colour. 



This specimen has 34 rows of scales round the middle 

 of the body, the ventrals being the largest; but the scales 

 on the back are not smooth as those of our Howong 

 specimen nor do they show the glossy appearence peculiar 

 to the scales of that specimen. The median part of the 

 scale, which e. g. in Tropidophorus Brookii wears a distinct 

 keel, is in our specimen provided with a groove flanked 

 on each side by a swollen band, the breadth of these 

 thicker bands with the groove in the middle measuring 



Notes from the Leyden Museum, Vol. XXV. 



