CHAP. XIX.] 
REPTILES. 
379 
and the Indian Peninsula ; and Langaha (2 sp,), confined to 
Madagascar. 
Family 13.— DIPSADIM1 (11 Genera, 45 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
N EAROTLC 
SUB-REGIONS, 
Palssarctic 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
- 2 . 3 - 
— 
- 2 
1 . 2 . 3 - 
1 . 2 . 3.4 
1 
1 
« 
iH 
The Dipsadidse, or Nocturnal Tree Snakes, are distinguished 
from the last family by their dark colours and nocturnal habits. 
They are about equally abundant in the Oriental and Neotropical 
regions, less so in the Ethiopian, while only a single species 
extends to North Australia. The following are the best known 
genera : — 
Dipsos, comprising all the Oriental species with one in Asia- 
Minor, and a few from the Moluccas, New Guinea, North Aus- 
tralia, West Africa, and Tropical America ; Thamnodyastes , 
Tropidodipsas , and several others, from Tropical America; Dipsa- 
doboa, from West Africa and Tropical America ; Leptodeira, from 
Tropical and South Africa, South America, and Mexico ; and 
Pythonodipsas, from Central Africa. 
Family 14, — SO YTALI DAS. (3 Genera, 10 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
N earcttc 
SUB-REG. ONS. 
Pal.-earctic 
Sub— regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub- regions. 
Australian 
Sub-regions. 
- 2.3 - 
It is doubtful how far the three genera which constitute this 
family form a natural assemblage. We can therefore draw no 
safe conclusions from the peculiarity of their distribution— 
Scytale and Oxyrhopits being confined to Tropical America; 
while Hologerrhum inhabits the Philippine Islandst 
