149, pDIPsSADOBOA. 81 
The descriptions of the two following Snakes are insufficient, and 
as the dentition does not appear to have been examined, it is even 
doubtful whether they belong to the genus Dipsadomorphus as here 
defined :— 
Diesas BERTHOLDI, Jan, Elenco, p. 103 (1863), and Icon, Gén. 38, 
pl. v. fig. 3 (1871). 
Rostral broader than deep; internasals shorter than the pre- 
frontals; frontal once and one fourth as long as broad, a little 
longer than its distance from the end of the snout, shorter than the 
parietals ; loreal as long as deep; one preocular, not reaching the 
frontal ; three postoculars; temporals 242; eight upper labials, 
fourth and fifth entering the eye; five lower labials in contact with 
the anterior chin-shields. Body strongly compressed. Scales in 
15 rows, vertebrals enlarged. Above with dark spots forming 
interrupted cross-bands; two dark lines running along the belly 
and tail. 
Habitat unknown.—Prof. Ehlers informs me the specimen is no 
longer to be found in the Gottingen Museum. 
Drpsas onnata, Macleay, Proc. Linn. Soc. N.S. W. (2) iii, 1888, 
p. 416. 
Head broad, flat, rounded at the muzzle, and very suddenly con- 
tracted behind into a very narrow neck. Body elongate, compressed, 
and tapering to a very long fine tail, Loreal nearly square; a 
large preocular ; two small postoculars; nine upper labials. Scales 
in 15 rows. Ventrals 277 ; anal entire; subcaudals 120. Yellowish- - 
white, closely barred with black. 
Total length 610 millim.; tail 230. 
King’s Sound, N.W. Australia. 
149. DIPSADOBOA. 
' Dipsadoboa, part., Giinth. Cat. Col. Sn. p. 182 (1858), 
Heterurus, part., Jan, Elenco sist. Ofid. p. 103 (1863), 
Anoplodipsas, Peters, Mon, Berl. Ac. 1869, p. 442. 
Maxillary teeth 16 to 18, followed, after a short interspace, by a 
pair of enlarged grooved fangs situated below the posterior border 
of the eye; anterior mandibular teeth feebly enlarged. Head 
distinct from neck ; eye rather large, with vertically elliptic pupil ; 
nasals concave. Body compressed ; scales smooth, with apical pits, 
disposed slightly obliquely, in 17 rows, the vertebral row enlarged ; 
ventrals rounded. ‘Tail moderate ; subcaudals single. 
West Africa. 
1. Dipsadoboa unicolor. 
_ Dipsadoboa unicolor, Giinth, Cat. p. 183 (1858), and Zool. Rec, 1872, 
p. 75 
VOL. III. G 
