28 VENOMOUS SNAKES AND THE PHENOMENA OF THEIR VENOMS 



Hydrophis cantoris. 



Dark olive body, with yellowish bands above; posterior part of body olive above, 

 yellow on sides; tail with vertical olive bands; blackish line throughout whole length 

 of belly. Length about 3.5 feet. Gulf of Bengal. 

 Hydrophis fasciatus. 



Head and neck black; yellow crossbands on neck, body pale with black rings, 

 which are wider near the back. Length 3.2 feet. Coasts of India, Cochin China, 

 and Malay Archipelago. 

 Hydrophis leptodira. 



Black with yellow streaks on neck, yellow rings on body. The streaks and 

 rings number 77. Length about 1.6 feet. Delta of Ganges. 



Genus ENHYDRINA Gray. 



Two vigorous poison fangs are accompanied by 4 solid teeth. Body moder- 

 ately compressed. Scales imbricated and distinct, but very small on belly. Color 

 olive or gray with black crossbands; sides of belly white. From the Persian Gulf 

 to New Guinea. 



Enhydrina valakadien s. bengalensis. (Plate 9, B.) 



Length about 3.5 feet. The male has stronger scales, keeled or tubercular. 

 Gulf of Persia, coasts of India, of Cochin China, Malay Archipelago and Papuasia. 



Genus HYDRELAPS Boulenger. 



Muzzle short, scales of head large. Poison fangs are followed by 6 rear teeth. 

 Body slightly compressed. Scales imbricated; ventral scales small, but well 

 marked. North coast of Australia. 

 Hydrelaps darwiniensis. 



Black and yellowish white rings, narrower near the belly; head dark olive with 

 black spots. Length 1.5 feet. Northern Australia. 



Genus HYDRUS Schneider. 



The maxillary bone of this genus is longer than the ectopterygoid and situated 

 somewhat behind the palatine bone. The poison fangs are cannulated and rather 

 short, followed by 7 or 8 solid teeth with a wide interspace between the fangs and 

 the latter. Snout long. Body rather short; scales hexagonal or squarish, juxta- 

 posed; no distinct ventrals. Indian and Pacific Oceans. 

 Hydrus platurus s. Pelamis bicolor Daudin. (Plate 9, c; plate n, A, B, c.) 



Anguis platurus Linnaeus, Syst. Nat., 12 ed., I, 391. 

 Hydrophis platurus Latreille, Nat. Hist. Rept., IV, 1802, 197. 

 Hydrus bicolor Schneider, Hist. Amph., I, 242. 



Color black and yellow, with crossbands bordered with black. Length 2.5 feet. 

 Indian Ocean, tropical and subtropical Pacific. 



Genus THALASSOPHIS Schmidt. 



Poison fangs followed by 5 small teeth. Snout short. Body rather elongate. 

 Scales hexagonal and juxtaposed, ventral scales indistinct. Coast of Java. 

 Thalassophis anomalus. 



Body with black bands, which are wider near back. Length about 3 feet. Java. 



Genus ENHYDRIS Merrem. 



Not Enhydris Latreille = Hypsirhina Wagler. 

 Enhydris Merrem = Lapemis Gray, 111. Ind. Zool II. 

 Lapemis hardwickii, type, Stejneger. 



Two poison fangs and 2 to 4 slightly grooved small teeth; body short and 

 thick; the scales, which are hexagonal or squarish, have almost completely dis- 

 appeared from the belly. Coast of India to the Chinese Sea and New Guinea. 



