4, DIPSAS. 461 
a suborbital lamina, widening behind; teeth 13 or 14, subequal ; 
mandibular teeth, anterior longest, gradually decreasing in length ;. 
pterygoids toothless. Head distinct from neck; eye large, with 
vertical pupil; nasal entire. Body strongly compressed; scales 
smooth, without pits, oblique, in 13 rows, vertebral row enlarged ; 
ventrals rounded. ‘Tail long; subcaudals in two rows. 
South America. 
Skull of Dipsas bucephala. 
1, Dipsas bucephala. 
Seba, Thes. i. pl. xliii. fig. 4 (1734). 
Dipsas indica, Laur. Syn. Rept. p. 90 (1768). 
Coluber bucephalus, Shaw, Zool. iii. p. 422, pl. cix. (1802). 
Bungarus bucephalus, Oppel, Ann. Mus. xvi. 1810, p. 392. 
Dipsas bucephala, Schinz, Cuv. Thierr. ii. p. 117 (1822) ; Schleg. Phys. 
Serp. ii. p. 281, pl. xi. figs. 16-18 (1837). 
Dipsadomorus indicus, Dum. § Bibr. vii. p. 470, pl. Ixvii. (1854). 
Leptognathus indicus, Giinth. Cat. p. 180 (1858). 
Dipsadomorus bucephalus, Jan, Elenco, p. 99 (1863), and Icon. Gén. 
37, pl. ii. fig. 1 (1870). 
Leptognathus bucephalus, Cope, Proc. Ac. Philad. 1868, p. 107. 
