40 IIB. W. THEOBALD, JTJK., ON TUB 



imperfect yellow collar crosses the occipitals, and a better-deve- 

 loped one a little further down the neck. Beneath whitish. Lips 

 yellow. This specimen, which is larger than the last, was captured 

 at Tonghu, and presented to me by the Eev. F. Mason, in spirit. 

 The head very closely agrees with Giinther's figure of O. siamensis, 

 the coloration less completely. Specimen a seems to cofrespond 

 with the description of the type ; and the two seem merely indi- 

 viduals of one species, with not more differences of coloration 

 than fall within specific limits. 



Family OLIGODONTIDJE. 

 SiMOTES, Dumeril (Sf Bibron. 



S. BTCATENATUS, Gliuthcr. 



a. Adult male. Body .... 14'50 



Tail .... 7-00 = 21-50. 

 Colour uniform brown, with a very narrow pale vertebral stripe, 

 and some very indistinct oblique dark markings, from some of the 

 scales of the back being black-edged. A dark saddle-shaped mark 

 across the frontals, an arrow-shaped mark on the crown, and 

 a narrow fillet forming a half-collar on the throat. Scuta black- 

 dotted. 



h. Adult female. Like the last. 



c. Adult male. Body .... 20-75 



Tail .... 3-00= 23-75. 

 Palo reddish-brown, salmon-coloured on tho sides. A narrow 

 pale vertebral stripe, not one scale broad, bordered by a dark 

 band, with a second dark band below it, along the sides. Belly 

 white, salmon-red in the centre. Scuta black-dotted, and head 

 symmetrically ornamented as in specimen a. 



d. Adult. Body .... 20-75 



Tail .... 3-00= 23-75. 



Uniform brick-red, with black edges to some of the scales of 

 the back. Belly yellowish, with largish but ill-defined spots at 

 the ends of the scuta. 



All these are described from life. This species is very com- 

 mon in Pegu and Tenasserim. My largest specimen was given 

 me by Lt. Beavan, from Tenasserim ; it was of the type and co- 

 louring of a, and measured 



Body ...... 27-60 



Tail 4-00 =31-50 



