22 9 



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

 Singapore. 



4. Hydrophis floweri Boulenger. 



Hydrophis Floweri, 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, Giinther, Kept. Br. Ind. 1864, p. 373, pi. XXV, fig. S. 

 Hydrophis obscurtis, Boulenger, Cat. Sn. Ill 1896, p. 284. 

 Hydrophis diadema, Boulenger, Rept. Malay Penin. 1912, p. 1 88. 



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 



