233 

 ii. Hydrophis mertoni (Roux). 



Distira mertoni, Roux, Abh. Senckenb. Ges. XXXIII 1910, p. 222, Taf. XIII, fig. 4. 



Head moderate; rostral more broad than deep; nasals much 

 shorter than the frontal, more than twice as long as the suture 

 between the praefrontals; frontal about one time and two 

 thirds as long as broad, much longer than its distance from 

 the rostral, almost as long as the parietals; one prae- and one 

 postocular; a single anterior temporal, not reaching the border 

 of the lip; six upper labials, third and fourth under the eye, 

 second deepest, in contact with the praefrontal; both pairs of 

 chin-shields in contact, posterior longest. Body not very long; 

 scales imbricate, with two or three small tubercles, in 39 rows 

 (37 anteriorly); shields of the head with small granules; ven- 

 trals 159, the posterior obtusely keeled. 



Blackish-olive above, with 46 yellow rings on the body, 10 

 on the tail; the yellow scales of the back speckled with olive- 

 grey; some of the rings are oblique and alternate on the 

 belly; all the rings narrowed on the back and the belly; 

 shields of the head with yellow spots, rostral and labials black. 

 Total length 380 mm. (After Roux ; not seen by me). 



Habitat: Aru Islands (Sungi Waskai on Wokam). 



12. Hydrophis polyodontus Jan. 



Hydrophis polyodontus^ Jan, Icon. gen. 41 1872, pi. I, fig. I. 

 Hydrophis polyodontus^ Boulenger, Cat. Sn. Ill 1896, p. 274. 



Head small; rostral more broad than deep; frontal slightly 

 more long than broad, as long as its distance from the rostral, 

 much shorter than the parietals; one prae- and two post- 

 oculars; one anterior temporal; seven upper labials, second 

 large, third and fourth entering the eye; both pairs of chin- 

 shields in contact. Body long, scales juxtaposed, with a small 

 tubercle, in 45 rows; ventrals 312. 



Yellowish above with black transverse rhomboidal spots; 

 head black. Lower surface black. Length of head and body 

 345 mm.; tail 33 mm. 



Habitat: Java (Probolingo!). 



13. Hydrophis brugmansi Boie. 



Hydrophis brugmansii^ Boie, Isis, 1827, p. 554- 



Distira brugmansii^ Boulenger, Cat. Sn. Ill 1896, p. 292. 



Hydrophis brugmansii^ Boulenger, Kept. Malay Penin. 1912, p. 184. 



