376 
GEOGRAPHICAL ZOOLOGY, 
[part IV, 
Lytorkynckus, EhamnopMs, Herpetetkiops and Qrayia, are Ethio- 
pian ; JRkineckis is peculiar to Europe ; Megablabes to Celebes, and 
Styporkynchus to Gilolo ; Cyclophis, is found in the Oriental re- 
gion, Japan, and North America ; Spilotes, in the Nearctic and 
Neotropical regions ; Xenelapkis in the Oriental, Ethiopian, and 
Palaearctic regions ; Pkilodryas, Heterodon and Herpetodryas in 
America and Madagascar, the latter genus being also found in 
China. 
Family 8. — HOMALOPSIDA5. (24 Genera, 50 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
Nearctic 
S UB-REGIQNS. 
Pal.-earctic 
SUB-ItEGIOm 
Ethiopian I 
SUB-RLGIONS. 
Orii ntal 
SUB-RIGIONS. 
Australian 
S UB-REGION3, 
1 — 3 — 
3 - 
— 2 . 3.4 
- 2 
1 . 2 . 3.4 
1.2 
The Homalopsidse, or Fresli-water Snakes, have been separated 
from the Hy dr idle by Dr. Gunther, and they include some groups 
which have been usually classed with the Natricime. They 
are especially characteristic of the Oriental region, where consi- 
derably more than half the genera and species are found ; next 
comes the Neotropical region which has 6 species ; while none 
of the other regions have more than 4 or 5. It is to be observed 
that the Ethiopian species occur in West Africa only, and mostly 
constitute peculiar geneia, so that in this family the separation 
of the Ethiopian and Oriental regions is very well marked. The 
best characterised genera of the family are the following : — 
Cantoria (10 sp.), ranging from Europe to Japan, the Philip- 
pines, and Timor, with one species in Guinea ; Hypsirh ina (6 
sp.), Bengal, China, and Borneo ; Fordonia (3 sp.), Pangoon to 
Borneo and Timor; Homalopsis (2 sp,), Cambodja to Java; 
Cerberus (2 sp.), Ceylon and Siam, the Malay Islands, New 
Guinea, and North Australia ; Herpeton (1 sp.), Siam; Ferania 
(1 sp.), Bengal to Penang ; Fythonopsis (1 sp.), Borneo ; Myron 
(2 sp.), India and North Australia ; Homalopkis (1 sp.), Borneo ; 
Hipistes (1 sp.), Penang; Xenodermus (1 sp.), Java; Neustero- 
pkis and Limnopkis , with one species each, are peculiar to West 
