276 



DESCRIPTIONS OF A NEW SNAKE AND A NEW FROG FROM SIAM. 

 Bv Malcolm A. Smitii. m.r.c.s., y.z.s. 



Simotes longicauda joynsoni, subsp. nov. 



Bodily configuration as in S. cj/durus. Nasal divided ; portion 

 of rostral visible above as long as its distance from the frontal ; inter- 

 nasal suture slightly shorter than interpraefiontal suture; frontal longer 

 than its distance to the end of the snout, as long as the parietais; loreal 

 slightly longer than deep; 1 prae- and 2 postocuiars ; temporals 1 + 2 

 (or 1 + 1 + 2, anterior very small ) ; 8 supralabials, 1th and 5tli border- 

 incf the eye ; ■!» infralabials in contact with the chin-shields, the anterior 

 pair of which are twice as large as the posterior. 



Scales smooth, in 17 rows in the anterior part of the body, 

 diminishing to 15 by fusion of the 4th and 5th rows above the ventrals 

 shortly after mid-body is passed, and continued so to the vent. Ventrals 

 100, slightly angulate laterally, anal entire, subcaudals 47. 



Colour (in spirits). Purpliah-brown above, with ill-dffined and 

 broken- up black cross-bands, every alternate one of wliich is enlarged 

 across the dorsum into a blotch. About 50 of these blotches upon the 

 body and tail. Below yellowish white, with large black quadrangular 

 sjiots which are mostly confined to the sides. Head markings similar 

 to iS. cyclurus, namelj', a large dark-browu crescentic band in front, 

 passing across the praefrontals and through the eyes, an oblique tem- 

 poral streak, and a narrow /^ shaped mark on the nape, its apex on the 

 frontal. 



Total length, 760 mm. ; tail 105. 



Dentition. Maxillary teeth 12, steadily increasing in size from 

 before backwards ; palatine, 7 ; pterygoid, 14, 



T^qie. Adult male, author's number l.llG, collected in the 

 valley of the Maa Vome, ^luang Ngow, N. Siam, in June 1017, by Mr. 

 U. W. Joynson, after whom I have named it. 



A second specimen was obtained bj' him a few days later, and 

 although there are differences in colour between the two, on lepidosis 

 it must be referred to the same species. 



JOUBN. NAT, HIST. 30C. SIAM 



