——— 
1. HAPLOPELTURA. 439 
Facial bones slightly movable ; prefrontal not in contact with 
nasal ; ectopterygoid (transpalatine) present ; pterygoid short, not 
extending to quadrate or mandible; supratemporal rudimentary ; 
maxillary horizontal, parallel with or converging posteriorly towards 
the palatine. Mandible without coronoid bone. Solid teeth in Woth 
jaws. 
The hypapophyses disappear in the anterior third of the dorsal 
vertebral column. 
These Snakes, which inhabit South-eastern Asia and Central 
and South America, may be readily distinguished from the 
Colubride, without an examination of the skull, by the absence 
of a mental groove, the mouth being susceptible of but slight 
expansion, and by the free termination of the pterygoid bones, which 
do not diverge behind, as may be seen on the back of the palate 
when the mouth is fully open. 
Synopsis of the Genera. 
I. Body more or less compressed. 
A. Maxillary very short, with 5 or 6 teeth. 
Subcaudals single .............. 1. Haplopeltura, p. 439. 
Subcaudals in two rows ........ 2. Amblycephalus, p. 440. 
B. Maxillary rather short, turned inwards, with 11 to 18 teeth. 
Pterygoids toothed ............ 3. Leptognathus, p. 446. 
Pterygoids toothless ............ 4, Dipsas, p. 460. 
II. Body cylindrical ..........%. 5. Pseudopareas, p. 462. 
1. HAPLOPELTURA. 
Dipsas, part., Schleg. Phys. Serp. ii. p. 257 (1837). 
Aplopeltura, . Dum. § Bibr. Mém. Ac. Se. xxiii. 1853, p. 463, and 
Erp. Gén. vii. p. 444 (1854). 
Amblycephalus, Giinth. Cat. Col. Sn. p. 184 (1858); Jan, Elenco 
sist. Ofid. p. 100 (1863) ; Giinth. Rept. Brit. Ind. p. 825 (1864). 
Maxillary bone very short, deep, with five subequal teeth; 
maxillary and mandibular teeth decreasing in size posteriorly. 
Head distinct from neck; eye large, with vertical pupil; nasal 
entire. Body strongly compressed; scales smooth, without pits, 
oblique, in 13 rows, vertebral row strongly enlarged ; ventrals 
rounded. ‘Tail moderate ; subcaudals single. 
Pinang, Malay Archipelago. 
1. Haplopeltura boa. 
Amblycephalus boa, Bote, Isis, 1828, p. 1034; Giinth. Cat. p. 184 
(1858), and Rept. Brit. Ind. p. 325 (1864) ; ’ Jan, Icon. Gén. 37, 
pl. iii. ina 2 (1870) ; Modighani, Ann. Mus. Genova, (2) Vii. 1889, 
120 
Pp. 
