567 



DARK-BLUE IIYDRUS. 



Hydrus Atrocoerulcus. II. atroccendcus, abdomine jlcnescentc, 



linea media ccerulea. 

 Dark-blue Hydrus, with yellowish abdomen marked by a 



middle line of blue. 



Mutta Pain. Russ. Ind. Serp. p. 35. pi. 30. 

 Hydras Enydris. Schneid. Amph. Fasch. 1. p. 245. 



LENGTH one foot eight inches : colour a very 

 dark changeable blue ; abdomen yellowish white, 

 with a dark blueish line along the middle : head 

 small, and covered with large scales : fore part of 

 the body slender ; circumference of the trunk, in 

 the thickest part, about two inches and a quarter : 

 tail short, small, taper, and compressed. This 

 snake, which is described by Dr. Russel, was taken 

 in an Indian lake called Ankapilty, in one of the 

 traps employed for catching eels : it appeared to 

 be harmless; having in the upper jaw a marginal 

 and two palatal rows of small reflex teeth. 



CINEREOUS HYDRUS. 



Hydrus Cinereus. H. cinereus t rostro subtruncato, abdomine sub- 



jlavescente. 

 Ash-coloured Hydrus, with subtruncated snout, and abdomen 



tinged with yellow. 



Hydrus Ilynchops. Schneid. Am ph. 1. p. 246*. 

 Karoo Bokadam. Russ, Ind. Serp. p. 23. pi. 17. 



LENGTH near three feet and a half: thickness 

 near the head about three inches : middle of the 



