229 



Persia; India!; Burma; Tenasserim; Siam; Malay Peninsula; 

 Singapore. 



4. Hydrophis floweri Boulenger. 



Hvdrophis Flo'd'cri^ Boulenger, Proc. Zool. Soc. 1898, p. 106, pi. IX. 



Head very small; rostral more broad than deep; frontal one 

 time and a half as long as broad, as long as its distance from 

 the rostral, much shorter than the parietals; one prae- and 

 one postocular; a single anterior temporal; six or seven upper 

 labials, third and fourth entering the eye; two pairs of chin- 

 shields, the posterior separated. Body very slender anteriorly; 

 scales imbricate, almost smooth on the neck, keeled on the 

 body, in 37 rows (27 anteriorly); ventrals distinct, 298 — 321. 



Dark olive or black above, with 69 yellow transverse bars 

 on body and tail, narrower than the interspaces; head with 

 a yellow band from eye to eye across the snout and a yellow 

 band behind the eye; small yellow markings on the crown. 

 Length of head and body 820 mm.; tail 80 mm. 



Type-specimen examined in the British Museum. 



Habitat: Borneo (Brunei Bay!). 



5. Hydrophis diadema Gthr. 



Hydrophis diadema^ Gunther, Kept. Br. Ind. 1864, p. 373, pi. XXV, fig. S. 

 Hydrophis obscurus^ Boulenger, Cat. Sn. Ill 1896, p. 284. 

 Hydrophis diadema.^ Boulenger, Rept. Malay Penin. 191 2, p. 188. 



Head very small ; eye as long as its distance from the mouth. 

 Rostral more broad than deep; frontal more long than broad, 

 as long as its distance from the rostral or the tip of the 

 snout; one prae- and one or two postoculars; a single anterior 

 temporal; seven or eight upper labials, third and fourth entering 

 the eye; posterior chin-shields small and usually separated. 

 Body long, extremely slender anteriorly; scales imbricate, 

 rhomboidal, feebly keeled in the female, strongly in the male, 

 the keels often broken up in tubercles, in 40 — 50 rows (31 — 40 

 anteriorly); ventrals 310 — 438, feebly enlarged, with two keels 

 in the male. 



Olive or dark green above, with yellowish transverse bars, 

 forming complete rings in the anterior part, interrupted on 

 the back more behind; or pale olive with dark bands, forming 

 rings in front; a yellow spot on the snout and a yellow streak 



