10 — 



for the first time. His specimen is also provided with the scales in 27 rows, 

 although Boulenger states it is rare condition. 



Measurements of Trimeresurvs monticola. 



Museum. 



No. 



Locality. 



Collector. 



Scale 

 rows. 



V. 



A. 



Subc. 



Inter-Oc. 



Supra-1. 



Body. 



Tail. 



Inst. Sci. 



92 

 93 



Arisan 



Koyama 



J27 

 (25 

 (30 

 \27 



144 

 145 



1 

 1 



48 

 54 



8 

 8 



9 

 10 



mm. 

 550 



530 



mm. 

 98 



110 



23. Trimeresurus gracilis sp. nov. 



Plate XII, fig. 3-6. 



Rostral slightly broader than high, scarcely visible from above, behind 

 its truncated uper edge two scales of nearly same size as the other upper 

 scales between supraoculars ; three canthal scales in the right, four in the 

 left, the anterior shield separated from the rostral by a small triangular 

 scale, upper edge of winch being visible from above ; supraoculars two-fifths 

 as broad as interocular space ; 7 scales on a line between supraoculars ; head 

 scales flat, faintly tubercular or keeled ; nostrils large, . rounded, in the middle 

 of a large undivided nasal, upper edge of winch not visible from above ; 

 loreal elongate, nearly twice as long as high, below second and third canthal 

 scales, in contact behind with two preoculars, which are subequal in size ; a 

 large squarish shield separated from the supralabials forms the anterior part 

 of the pit ; subfoeveal entering eye below preoculars ; eye rather small ; a 

 very long, narrow, crescentic subocular, separated from preocular by the sub- 

 foeveal and from supralabials by one scale row ; two postoculars ; temporals 

 numerous, most of them flat and smooth, upper shields keeled, the lower 

 series next to supralabials somewhat larger ; 8 supralabials, first triangular, 

 second rather small, separated from the loreal by the prefoeveal shield, third 

 the largest ; two lower labials in contact with the anterior chin-shields ; 

 posterior chin-shields scarcely differentiated ; 19 rows of scales, of which all 

 except the outer are strongly keeled, narrow and pointed ; 149 ventrals ; anal 

 entire ; 53 pairs of subcaudals. 



