54 BARBOUR: ZOOGEOGRAPHY. 



Guinea, one found in British New Guinea and Timor, and also in Queensland. 

 The only other member of the genus has been found on the islands of Timor, 

 Savu, and Samao. 



Enygrus is another genus which originated here, and we find two species 

 on the island. 



Acrochordus, Chersydrus, and Fordonia are three monotypic genera, all of 

 the same class, which range widely, probably owing to their semi-aquatic habits, 

 as they are frequently found in estuarine regions where the water is strongly 

 saline. 



Three forms of Natrix occur, — one peculiar, another found also in Australia, 

 and the third occurring on the Papuan islands of Waigiu and the Aru group. 

 The genus so prominent on the Sunda Islands here reaches almost the limit of 

 its range. 



The monotypic Brachyorrhus albus (Linn6) occurs in New Guinea, in the 

 Moluccas, and on Timor. 



Stegonotus, also Papuan, has two local species, and two others which occur 

 on the Moluccas as well. 



Dendrelaphis, a Malayan genus, has two peculiar species here; while 

 Enhydris, a similar genus, has one autogenous form. 



Dendrophis, also Malayan, has two pecuhar species; one form ranges 

 through the Moluccas, as well as through the Solomons, Bismarck Islands, and 

 Queensland, and a fourth form is confined to New Guinea and the Bismarck 

 Archipelago near by. 



Boiga irregularis (Bechs.) is the single representative of the genus in this 

 area, but the species has a wide range from Celebes eastward. 



The other genera found, nine in number, are all of elapine affinities, and are 

 probably closely associated with the similar forms which predominate so very 

 strongly in AustraUa. Some of these genera, such as Pseudelaps, with one 

 species; Apisthocalamus, with two species; Toxicocalamus, with one species; 

 Pseudapisthocalamus, with one species, are pecuhar to New Guinea. Micro- 

 pechis has one species each in New Guinea and the Solomon Islands. Glyphodon 

 and Acanthophis are two monotypic genera which occur both in Australia and in 

 Papua. It should be noted, however, that G. tristis Gthr. occurs only in south- 

 eastern New Guinea. 



Of the important and very characteristic Australian genus, Pseudechis, 

 one species occurs in southeastern New Guinea and in Queensland, while another 

 is confined to the same region in Papua. 



