133. HEKPEXON. 25 



the snout ; eye between four shields, viz. a supraocular, a prseocular, 

 a Bubocular. and a smaU. postooular ; seven upper labials ; five lower 

 labials ia contact with the anterior chin-shields ; posterior chin- 

 shields extremely small. Scales in 35 to 43 rows. Ventrals 

 153-165 ; anal divided ; subcaudals 22-35. Pale grey or brownish 

 above, with black cross-bands as broad as the interspaces between 

 them or narrower ; Ipwer parts white. 



Total length 485 millim. ; tail 50. 



Mouths of rivers and coasts of Pegu, Siam, and the Malay 

 Peninsula. 



a-b. d (Sc. 37 ; V. 160 ; 0. 34) Pinang. Dr. Cantor. 

 &yg. (Sc.39; V. 155;C.35). 



c. S (Se. 43 ; V. 160 ; 0. 27). Pinang. F. Day, Esq. [P.]. 



d. (J (Sc. 41 ; V. 160 ; C. 31). Bangkok. Chri.stiama Museum. 



e. d (Sc. 39 ; V. 165 ; 0. 33). Pegu. W. Theobald, Esq. [0.]. 



/. <S (Sc. 39 ; V. 157 ; 0. 33). ? (Type of £itia hydroides.) 



ff. 2 (Sc. 39 ; V. 161 ; 0. 24). ? h\ve ol Ilipistesfasciatus.) 



h. $ (Sc. 41 ; V. 161 ; 0. 27). ? 



133. HEEPETON. 



Erpeton, Lacip. Bull. Sc. Soc. PMlom. ii. 1800, p. 169, and Ann. 



Mm. ii. 1803, p. 280; Gray, Cat. Sn. p. 62 (1849) ; Ihim. ^ Bibr. 



Erp. Gin. vii. p. 983 (1854). 

 RMnopirus, Merr. Tent. 8yst. Amph. p. 81 (1820). 

 Herpeton, Wagl. Syst. Amph. p. 169 (1830) ; Giinth. Proa. Zool. Soc. 



1860, p. 115, and Ann. ^ Mag. N. H. (8) viii. 1861, p. 266, and 



Rept. Brit. Ind. p. 288 (1864) ; Jan, Arch. Zool. Anat. Phys. iii. 



1865, p. 255. 

 Homalopais, part., Schleg. Phys. Serp. ii. p. 332 (1837). 



Maxillary teeth 12 or 13, followed, after a short interspace, by a 

 pair of slightly enlarged grooved teeth ; mandibular teeth subequal. 

 Head distinct from neck, with two long, scaly, rostral appendages ; 

 eye small, with vertically elliptic pupil ; head-shields large ; nostril 

 in a semidivided nasal, which is separated from its fellow by a series 

 of small scales ; loreal region covered with small scales ; no regular 

 chin-shields. Body cylindrical ; scales strongly keeled, in 37 rows ; 

 ventrals very liarrow, bicarinate. Tail moderate, covered with 

 uniform keeled scales. 



Cochinohina and Siam. 



1. Herpeton tentaculatnm. 



Erpeton tentaculatus, Lacip. Bull. So. Soc. PMlom. ii. 1800, p. 169, 

 and Ann. Mus. ii. 1803, p. 280, pi. 1. ; Daud. Rept. vii. p. 246, 

 pi. Ixxxvi. (1803) ; GuSr. Icon. R. A., Rept. pi. xx. fig. 3 (1844) ; 

 Gray, Cat. p. 63 (1849) ; Bum. %■ Bibr. vii. p. 984 (1854). 



Ehinopirus erpeton, Merr. Tent. p. 82 (1820). 



Homalopsis herpeton, Schleg. Phys. Serp. ii. p. 359 (1837), and 

 AbbUd. p. 50, pi. xvi. (1839)^ 



Herpeton tentaculatum, Jan, Icon. Gin. 1, pi. i. (1860) ; Giinth. 

 Proc. Zool. Soc. 1860, p. 114, pi. zxiii. ; Cornalia, Rev. ^ Mag. Zool, 



