266 CLASS xv. 



HydropMs DAUD., Enhydris MERR. Scales carinate with 

 a tubercle in the middle, hexagonal. In the keel of abdomen a 

 row of larger scales biturberculate, sometimes irregular and di- 

 vided throughout. 



Sp. Hydrophis doliatus, Disteira dollata LAC. Ann. du Mus. IV. PL 57, fig. 2 ; 

 Hydrophis gracilis SCHL., Hydrophis fasciatus GUERIN, Iconogr., Rept. 

 PL 25, fig. i, RUSSELL Serp. i. PL 44, CANTOR 1. 1. PL 56. Hydrophis 

 striatus SCHLEG. Faun. Japon., Serp. PL 7, &C. 1 



Acalyptus DUM. BIBR. Head scaly posteriorly, with occipital 

 scute none. Scales imbricate. 



Sp. Acalyptus superciliosus DUM., BIBR. ; from PisROx's Voyage, considered 

 by SCHLEGEL as a variety of Hydrophis palamidoides. 



Pelamys DAUD. Abdomen and tail covered below with small 

 hexagonal scales, tuberculate in the middle. Abdomen compressed 

 below, with acute margin between two rows of scales. 



Sp. Pelamys bicolor DAUD., Hydrophis Pelamis SCHLEG., RUSSELL Serp. i. 

 PL 41, VOSMAER Beschrijv'mg van de bruinrug-platstaart-slang , 1774, Cuv. 

 R. Ani., ed. ill., Rept. PL 36 bis, fig. i ; in the Indian Sea and South 

 Pacific ; the most common species of this family. 



tf Innocuous serpents. 



A. With last 'tooth of upper jaw larger than the rest, sulcated. 



Family VIII. Asineophes s. Glyphodontes (Opisthoglyptes 

 DUM. and BIBR.) Head scutate. Subcaudal scutes almost always 

 in pairs. 



Dipsas LAUR. Head flat above, broader than trunk, triangular, 

 obtuse anteriorly. Eyes large. Body compressed. Tail acumi- 

 nate, long. Mostly a row of larger hexangular scales in the keel 

 of back. 



Sub-genera: Telescopus WAGL., DUM., BIBE., Rhinobothryum 

 WAGL., DUM., BIBR., Himantodes DUM., BIBR., Triglyphodon DUM., 

 BIBR, (Cephalophis FITZ.), Anholodon DUM., BIBR., Heterurus DUM., 

 BIBR. 



Sp. Dipsas Nattereri SCHLEG., (Di-yophylax), Coluber Nattereri MIKAN., MAX. 

 Pr. v. WIED, All., Liefer, xiv.; Dipaa* Cynodon Cuv., Opetiodon Cyno- 



1 Hydrophis palamidoides SCHLEG. belongs to this genus, and not to Pelamys. 

 Here also is to be placed Hydrophis schizopholis SCHMIDT; Abhand. herausgegeben von 

 dem naturwissensch. Verein in Hamburg, I. 1846, Taf. xv. (afterwards raised into a new 

 genus by FISCHER 1. 1. p. 37, under the name of Astrotia). 





