384 



GEOGRAPHICAL ZOOLOGY. 



[part IV. 



Family 23.— IIYDIJOPHID^. (8 Genera, 50 Species.) 



General Distribution. 



XrOTROPTCAL 



Stb-reoions. 



Nearctic 

 Sub-regions. 



Pal.earctic I Ethiopian I Oriental 



SUB-UEGI0N8. SUB-RKGIONS. SUB-REfilONS. 



3 



Australian 

 Sub-regions. 



— 4. 11.2.3.4 



1.2.3.4- 



The Hydropliidfie, or Sea Snakes, are a group of _small-sized 

 marine serpents, abundant in the Indian and Australian seas, 

 and extending as far west as Madagascar, and as far east as 

 Panama. They are very poisonous, and it is probable that many 

 species remain to be discovered. The genera are distributed as 

 follows : — 



HydropMs (37 sp.), ranging from India to Formosa and Aus- 

 tralia ; Flaturus (2 sp.), from the Bay of Bengal to New Guinea 

 and New Zealand ; Aipysurus (3 sp.), Java to New Guinea and 

 Australia; Distcira (1 sp.), unknown locality ; Acahjptus (1 sp.), 

 South-west Pacific ; Enhydrina (1 sp.), Bay of Bengal to New 

 Guinea ; Pclamis (1 sp.), Madagascar to New Guinea, New Zea- 

 land, and Panama ; Emydoccphalus (1 sp.), Australian Seas. 



Family 24.— CPtOTALIDJ^. (11 Genera, 40 Species.) 



General Distkibution. 



Keotropical I Nearctic 

 Sub-regions. Sub-reqions. 



1.2.3.4 1.2.3.4 



Pal.earctic 

 Sub-regions. 



-3.4 



Ethiopian 

 Sub-regions. 



Oriental 

 Sub- regions. 



Australian 

 Sub-regions. 



1.2.3.4' 



The Crotalidffi, or Pit Vipers, including tlie deadly Eattlesnakes, 

 form a well-marked family of fanged serpents, whose distribu- 

 tion is very interesting. They abound most in tlie Oriental 

 region, at least 5 of the genera and 20 species being found witliin 

 its limits, yet they are quite iniknovvn in the Ethiopian region 

 — a parallel case to that of the Bears and Deer. A few species 

 are peculiar to the eastern portion of the Palrearctic region, while 



