16. CAL0IB8. 817 



Total length 620 millim. 



Head 37 „ 



Width of head 22 „ 



Body 83 „ 



Fore limb 65 „ 



Hind limb 105 „ 



TaU 400 „ 



Indo-Malayan peninsula and archipelago. 



An examination of the series in the British Museum shows that a 

 separation of C. cristaiellus from C. moluccanus cannot be carried 

 out, although indeed the extreme forms are rather different. The 

 typical C. cristaiellus has the rostral very small, separated from the 

 nasal by three or four scales, the two first supralabials very small, 

 the nasal being situated above the third labial, and eighty-one to 

 ninety-seven scales round the middle of the body. C. moluccanus 

 has the rostral larger, separated from the nasal by one or two scales, 

 the nasal situated above the second labial, and fifty-nine to sixty- 

 three scales. However, there are many exceptions, an^ as similar 

 variations occur also, independently of localities, in the allied 

 O.juhatus, I think a specific separation would not be justified. 



We have specimens which, in the rostral scutellation, are typical 

 C. cristaiellus, but with seventy-five rows of scales ; others with the 

 same number of scales, but with the rostral scutellation of 0. moluc- 

 canus ; others have the nasal separated from the rostral by three 

 scales and, nevertheless, situated above the second labials, &o. 



That the number of scales does not exactly correspond with the 

 localities is well shown by specimens Z-o, which, of same size and 

 similar in every other respect, vary in the number of scales round 

 the middle of the body from seventy-five to ninety-one. 



a,b. (S & hgr. Penang. Gen. Hardwicke [P.]. 



c-d. cJ • Penang. Dr. Cantor. 



e-f. c? ■ Singapore. 



ff-i. Hgr. Singapore. Sir E. Belcher [P.]. 



k. (S . Singapore. Dr. Dennya [P.]. 



l-o. Hgr. Nias. Hr. Sandemann [0.]. 



p-y- 6 S • Borneo. Sir E. Belcher [P.]. 



r-t, u-v. S & hgr. Borneo. L. L. Dillwyn, Esq. [P.]. 



w. 5 . Puerto Princesa. A. Everett, Esq. [C.]. 



x-y. Hgr. Dinagat Island. A. Everett, Esq. [C.]. 



z-^. Hgr. & yg. Celebes. 



y. Hgr. N. Ceram. 



8-f. Hgr. Mysol. 



ij. Hgr. Amboyna? 



e. Hgr. Timor Laut. H. 0. Forbes, Esq. [C.]. 



I. Skeleton. P 



