1881.] AND FROGS FROM SINGAPORE. 221 



behind, and then intersect the dark areas, until on the posterior part 

 of the back and tail there is a double row of brown spots. The white 

 bands expand at the side, and, except near the head, bifurcate around 

 a dark spot. Lower parts whitish. Head with a rather broad central 

 dark band throughout the vertical and occipitals, and joined behind 

 to the large brown spot on the back of the neck ; the sides of the 

 vertical and occipitals, with the greater part of the sides of the head 

 and neck, are pale ; but there is a dark patch on each superciliary 

 shield, another on the temporals on each side, and the greater part 

 of the snout in front of the eyes is dark brown. 



Length of the specimen 13 inches, of which the tail is 3"1, or 

 nearly one fourth. 



The principal characters by which this form may be distinguished 

 from N. maculatum are : — (1) The greater length of the vertical 

 shield : in N. maculatum the vertical is much shorter than an oc- 

 cipital, the latter being equal in length to the vertical and post- 

 frontals together ; in N. subannulatum the vertical and postfrontals 

 together are much longer than an occipital. (2) Dentition, there 

 being only one larger tooth at the back of the jaw. In N. macula- 

 tum the nasals are described as separated by an indistinct suture ; but 

 I cannot detect with certainty a suture in the type ; and in the 

 second specimen the nasal is certainly undivided '. 



I think it not impossible that the genus Ulupe, described by me ' 

 in 1878 from a Tenasserim specimen, is allied to Nymphophi- 

 dium. Ulupe has but 13 rows of scales round the body, and 

 there is no prseocular above the elongate loreal ; but in other respects 

 the genus approaches Nymphophidium very closely. I am far from 

 certain that I was right in assigning Ulupe to the Lycodontidce, to 

 which, it should be remembered, Odontomus was referred by Dumeril 

 and Bibron, although Giinther afterwards showed that the dentition 

 differed from the Lycodont type. 



Ptyas mucosa and Pt. korros. 



There are five specimens belonging to the genus Ftyas. One has 

 15 scales round the middle of the body, two have 16, and two 17; 

 in the latter there are 3 loreals ; all have the dorsal scales distinctly 

 keeled on the posterior portion of the body. I refer the first three 

 to Pt. korros, the latter two to Pt. mucosa ; but I believe all to 

 belong to one specific form and not to deserve to be distinguished, 

 except as varieties. Since determining the specimens, I have ascer- 

 tained that the individuals referred to Pt. mucosa are from Hong- 

 Kong. 



Tropidonotus rhodomelas. 



Tropidonotus rhodomelas, Boie, Isis, 1827, p. 535; Schlegel, 

 Phys. Serp. i. p. 167, ii. p. 310, pi. xii. f. 10, 11. 



1 In Jan's figure of Odontomus submmulatm a suture is sbowu below the 

 nostril, but not above. In the specimen examined by me there is on one side a 

 slight groove below the nostril, but no suture. 



■' J. A. S. B. 1878, vol. xlvii. pt. 2, p. 128. 



