PSAMMODYNASTES. 



173- 



distinct from neck, with angular canthus rostralis ; eye rather 

 large, with vertically elliptic or subelliptic pupil ; nostril in a 

 single nasal ; frontal very narrow. Body cylindrical ; scales 



Fig. 53. — Head of Psammodi/nasfes ^mlveriileutus. 



smooth, without pits, in 17 or 19 rows ; ventrals rounded, 

 moderate or rather short ; subeaudals in two rows. 

 South-Eastern Asia. Two species are known : — 



Tail 



Two pairs of chin-shields separating- the 



lower labials P. indverulentus, p. 173. 



Third lower labial very large, bordering the 



mental groove behind the small anterior 



chiu-shields P. jnctm, p. 174. 



189. Psammodynastes pulverulentus. 



Fsanimophis pulverulenta, Boie, Isis, 1827, p. 547. 

 Psammodynastes ptdverulentus, Giinth. Rept. Brit. Ind. p. 292 



(1864); Bouleng. Faun. Brit. Ind., Rept. p. 363 (1890) ; id. Cat. 



iSn. iii, p. 172 (1896) ; Wall, Jouru. Nat. Hist. Soc. Bombav, xx, 



p. 72, figs. (1910). 



Snout short, pointed or somewhat turned up in the adult. 

 Eostral broader than deep ; internasals much shorter than the 

 praefrontals ; frontal twice to twice and a half as long as broad, 

 much narrower, in the middle, than the supraocular, much longer 

 than its distance from the end of the snout, a little shorter than 

 the parietals ; loreal about as long as deep, often transversely 

 divided into two ; 1 or 2 praj- and 2 to 4 postoculars ; temporals 

 2 + 3 (rarely 2+2); 8 upper labials, third, fourth, and fifth 

 entering the eye ; 3 (rarely 4) lower labials in contact with the 

 anterior chin-shields, which are followed by t^o smaller pairs. 



