192 COLUBRID. 
9. PRYMNOMIODON. 
mnomiodon, Cope, Proc, Ac. Philad. 1860, p. 558; Giinth, Rept. 
rit, Ind. p. 274 (1864). sete 
Maxillary teeth minute posteriorly, becoming much longer ante- * 
riorly. Head moderately distinct from neck. Eye rather large, 
with round pupil. Body slender; scales keeled, in 19 rows; ven- 
trals rounded. Subcaudals in two rows. 
Siam. 
1. Prymnomiodon chalceus. 
Prymnomiodon chalceus,- Cope, 1. c.; Giinth. l.c. 
Snout rather narrow. Rostral nearly as deep as broad ; nostril 
between two nasals, which are equal in size; frontal rather large ; 
loreal trapezoid; one preocular, not reaching the frontal; three 
postoculars ; eight upper labials, fourth and fifth entering the eye; 
posterior chin-sields longer than the anterior. Scales in 19 rows, 
elongate, all kee'ed. Ventrals 152; anal entire; subcaudals —? 
(tail mutilated). Olivaceous above, shading into leek-green upon 
the flanks, and greenish white upon the belly ; a vertebral stripe of 
light green bordered with black extends from the parietal shields to 
the origin of the tail, involving one row of scales and two halves; 
enother rarrower and paler stripe extends from the third and fourth 
rows of scales upon each side from the neck to the origin of the 
tail; this stripe is bounded above by an interrupted narrow black 
border ; temporal region bright green, shields of head tinged wich 
fulvous ; upper labials and preocular white ; a narrow black post- 
ocular vitta. 
Length of body 300 millim. 
Siam. 
Judging from the description, this Snake appears to resemble 
closely the American 7’ropidonotus saurita, from which, however, the 
dentition distinguishes it. 
Under the name of 
TROPIDONOTUS NICOBARIENSIS, 
W. L. Sclater, Journ. As, Soc. Beng, 1x. 1891, p. 241, pl. vi. fig. 5, 
a young Snake from Camorta, N?cobars, is described and referred 
with doubt to the genus 7’ropidono'us, which agrees well in most 
respects with Prymnomiodon chalceus but for the division of the anal 
shield and the isodont(?) dentition. It has 1%2 ventrals and 
119 subcaudals. 
10, TROPIDONOTUS. 
Natrix, part., Laur. Syn. Rept. p. 73 eb . ‘ 
Tropidonotus, Kuhl, in Férussac, Bull. Sc. Nat. ii. 1824, p. 81; Boie, 
sis, 1827, p. 618. - 
Tropidonotus, part., Schley. Phys. Serp. ii, p. 297 (1837); Dum. § 
~~ —<—s <). 
ee ee ae 
