llKUPETOLOaY. 321 



bliick rings dilated on the biu-k and belly, and e(]ual to the interspaces. Head blaek, 

 \vith two lateral yellow bands eonverfjinii: on the nasals. Tail black, with a basal 

 white ring, and some half rings across the back. 



H. LoxGiCEPs, Giinther. 



Ilrad elongate, body slender. Scales keeled, 30 rows round the neck. Yentials 

 271, twice as broad as the adjoining scales. Hack barnnl by 53 broad blackish-olive 

 bands, which do not reach the middle of the sides, the interspaces one-third as broad 

 as the bands. Sides and belly uniform whitish. Tail with 11 vortical bars. 



H. ORN.tTA, Gray. 



Snout elongate, body ratlu'r elongated anteriorly. Scales tubercular, 35 rows 

 round the neck. Ventrals 252 to 2(')0, twice as broad as the adjoining .scales. 

 Colouration as in U. lungieeps, but the interspaces are narrower. A wedge-shaped 

 spot, point upwards, separates the end of the cross-bands, and a vertical bar below 

 each band. Head blackish-olive, with white supcniliary ridge. Tail black, with 

 narrow whitish cross-bars. 



H. Elltoti, Giinther. 



General aspect as in IT. vniata, but as many as 300 ventrals, and with white 

 stripes between the bands. Head greenish-olive. Tail with yellowish cross-bars. 



H. PACHYCKECCS. 



The third upper labial enters the orbit, and is not in contact with the nasal. 

 Scales tuborcularly keehul, 28 rows on the neck. Ventrals 258, and more than 

 twice as broad as the adjoining scales. Body brownish-yellow above, indistinctly 

 banded. Belly and sides white. Tail black behind. 



H. CRAssieoi.Lis, Anderson. 



Neck and body of nearly eijual girth. Scales almost smootli, in 34 rows round 

 the neck. Scales feebly bitubercular posteriorly. Ventrals twice the size of the 

 adjoining scales, and smooth. Two pairs of prteanal shields, the outer very large. 

 Colour olive-yellow above, yellowish below. 62 broad black bands across the back, 

 coming to a point on the sides, and indistinctly produced below, where tliey expand 

 into a large blackish s])ot. Tail with six black rings and its terminal third black. 



Body 49'3 ; tail 4-o=-53'G inches. 



Hugli River. 



H. viPEKi.vA, Schmidt. 



Head and body moderate. The third upper labial does not enter the orbit. Scales 

 keeled, 29 rows round the neck. Ventrals 237, anteriorly six times as broad as the 

 adjoining scales, diminishing to the breadth of a single scale towards the vent. 31 to 

 38 rhombic black spots along the back, sometimes confluent in fi'ont. 



H. ANOMALA, Schmidt. 



Head short, thick, obtuse ; body stout. Scales hexagonal, with a strong white 

 keel. Ventrals bicarinate, and as large as the adjoining scales. Trunk with 20 or 27 

 large rhombic bluish-grey transverse spots. 



Enhydrina, Gray. 



Differs from Ili/dinjihis oidy in having a deep longitudinal notch in front of the 

 lower jaw. llostral shield very small ; lobuliform, its point fitting into a cavity in the 

 lower jaw. 



E. liAr.AKADVKX, Boic. 

 E. Bengalensis, Gray. 



Head short, and all its shields granular. Scales hexagonal or suboval, carinated 

 in the centre, and contiguous rather than imbricate, in 38 to 44 rows round the neck. 

 Back with rhombic bauds, wliich disappear with age. 



21 



