FAUNA AND FLORA, RATBURI, PETCHABURI, 165 
OPHIDIA. 
PyrHon RETIcULATUS, Schneid. 
PoLYODONTOPHIS COLLARIS, Gray. 
This snake, not previously recorded from Siam, appears to be 
fairly widely distributed throughout the country. 
TRIRHINOPOLIS NUCHALIS, Blqr. Ty 
Two specimens of this rare snake were obtained near the border 
at an elevation of 700 m. Details are as follows :— 
No. 1. (sex undermined, owing to damage). ‘Total length, 
158 mm., tail 53. Costals 15 throughout, the median scales faintly 
keeled on the posterior part of the body. Ventrals 141. Sub- 
caudals 24. 
Colour (in spirits). Above purplish brown, most of the scales 
edged with black so arranged across the back as to present a series 
of fairly well-defined circular or oval rings. Below whitish, freely 
speckled with black, and with large, black rectangular spots, placed 
laterally. A black arrowheaded mark upon the nape, beginning at 
the frontal shield, and a pale chevron behind it. Most of the head 
scales edged with black. Chin and throat white. 
No. 2. Male. ‘Total length 458 mm, tail 47. Dorsal keels more 
stronly marked than in No. 1. Ventrals 1382. Subcandals 24. 
Colour (in spirits). Light pinkish-brown above, the black edging 
to the scales forming posteriorly, fairly well defined crossbars. Belly 
only sparely sprinkled with black. The rectangular spots become 
crescentic in shape in the posterior half. 
The infralabials in this species are unusual, in that the first pair 
are not in contact with each other, but are separated by the chin- 
shields which are in contact with the mental. 
Troprponotus PiscaTor, Kuhl. 
TROPIDONOTUS CHRYSARGUS, Schleq. 
This species does not yet appear to have been recorded from the 
country except from Patani. It is fairly common in the jungle east 
of Sriracha. 
CoLuBER RADIATUS, Sehleg. 
~ CoLuBER OXYCEPHALUS, Bote. 
A large specimen of this handsome snake was found in the Bong 
Tee valley. It has not previously been recorded from Siam. 
SIMOTES VIOLACEUS, Cantor. 
