148. pIPsADOMORPHUS. 59 
ees leucocephalus, Giinth. Cat. p. 168 (1858). 
Oxyr pene leucocephalus, Jan, Elenco, p. 92 (1863), and Icon. Gén, 
365, pl. iii. fig. 3 (1870). : 
Rostral broader than deep, just visible from above ; internasals 
much shorter than the prefrontals; frontal a little longer than 
broad, as long as its distance from the end of the snout, a little 
shorter than the parietals ; loreal longer than deep; one preocular, 
in contact with or narrowly separated from the frontal ; two post- 
oculars; temporals 2+3; eight upper labials, fourth and fifth 
entering the eye; four lower labials in contact with the anterior 
chin-shields, which are as long as or a little longer than the posterior. 
Seales in 19 rows. Ventrals 228-258; anal entire; subcaudals 
110-125. Yellowish or pale brown above, with dark brown cross- 
bars, which may be broken in the middle and alternate; head 
white ; neck blackish brown; uniform whitish beneath. 
Total length 1080 millim.; tail 250. 
Guianas, Brazil, Bolivia. 
a. 2 (V. 228; C. 116). Berbice. 
b. Yg. (V. 248; C. 112). Berbice. Lady Essex [P.}]. 
e-d. f (V. 245; C. 124) & hgr. Demerara Falls. 
(V. 248; C. 110). 
e. od (V. 247; C. 125). Para. 
f. 2 (V. 258; C. 118). Brazil. Lord Stuart [P.]. 
g- & (V. 237; C.?). Brazil. 
148. DIPSADOMORPHUS. 
Hurria, part., Daud. Rept. v. p. 275 (1803). 
Boiga, part., Fitzing. N. Class. Rept. p. 29 (1826). 
Dipsas, part., Bote, Isis, 1827, p. 548; Schleg. Phys. Serp. ii. p. 257 
(1837) ; Giinth. Cat. Col. Sn. p. 169 (1858) ; Jan, Elenco sist. Ofid. 
p. 103 (1863) ; Giinth. Rept. Brit. Ind. p. 307 (1864). 
Dipsadomorphus, Fitzing. in Tschudi, Faun. Per., Herp. p. 55 (1845). 
Opetiodon, Dum. §& Bib. Mém, Ac, Se, xxiii. 1853, p, 494, and Erp. 
Gén. vii. p. 905 (1854). 
Triglyphodon, Dum. § Bibr. Ul. cc. pp. 507, 1069. 
Toxicodryas, Hallow. Proc. Ac. Philad. 1857, p. 60. 
Dipsadomorphus, part., Ginth. Cat. p. 174. 
Boiga, Cope, Proc. Ac. Philad, 1860, p. 264. 
Pappophis, Macleay, Proc. Linn. Soc, N.S. W. ii. 1877, p. 39. 
Dipsas, Bouleng. Faun. Ind., Rept. p. 357 (1890). 
Liophallus, Cope, Proc, Ac. ‘Philad. 1894, p.'427 (1895). °° 
Maxillary teeth 10 to 14, subequal in size, followed by two or 
three enlarged, grooved fangs ; anterior mandibular teeth longest. 
Head very distinct from neck; eye moderate or large, with 
vertically elliptic pupil ; posterior nasal more.or less deeply concave. 
Body. more or less compressed ; scales smooth, more or less oblique, 
with apical pits, in 17 to 31 rows, the vertebral row more or less 
enlarged; ventrals obtusely angulate laterally. Tail moderate or 
long ; subcaudals in two rows. 
Tropical Africa, Southern Asia, Papuasia, Australia, 
