HORN EXPEDITION SUMMARY. 191 



i.slancl^s, Varanm occurs in tlic MoUucciis, Ccleljes, New (JuiiiPa, Polyncsin-, Africa 

 and South Asia, Lvi^^osoma { = Ly,Q,oionin ■{■ Hiiiitlia -^ E)iioa ■\- SiapJios -V Rliodoiia of 

 various authoi's) occurs in Australia, East Indies, Cliina, Tropical and Soutli 

 Africa, Ablepliarus in Soutli and West Asia, Soutli-cast Europe, Tropical and 

 South Africa. 



A second series occur less widely distriliuted, but in such parts that they may 

 be regarded as having entered the continent from the north. These are — Ccraiiio- 

 dai'tvliis f(Hind in Arabia and Pei-sia ; Tlucadncfyliis in the East Indies, GcJiyra in 

 (he islands of the Indiai^ and Pacific Oceans and on the west coast of Mexico, 

 Lepidodactylus in the East Indies and Polynesia, Gonyocephalus in the East Indies 

 etc., Nicol)ar, and Andaman Islands, Physignatluis in Polynesia, Siam and Cochin 

 China, Tiliqiia in Australasia and the Indo-Malayan Islands. Lastly, of exotic 

 genera theie remains Ebenavia^ previously known only from Madagascar and 

 clos(>ly allied to Phyliodactylus, from which it dilTers in the absence of claws on 

 the digits. At the present day Phyllodactylu;;, as a moditicatioii of which 

 Elienavia may be regarded, occurs in Western Australia,, and it is at any late 

 possil)le that the Central Austi'alian Ebenavia and the Madagascar forms are 

 independent modifications of a widely-spread type. 



All the species of the genera are endemic in the Australian regions except 

 Ahlephariis hottloiiii^ which is " irregularly distributed over the bolter pai'ts of 

 both hemi.si)heres."— (Brit. Mus. Cat., Vol. IV., p. 34G). 



The endemic genera may l)e divided into thi-ee main groups : — 



1. A northern and north eastern group (<)r if not confined to tins aiea most 

 largely represented therein) represente<l by Rliyncddiirn, I/c/crc/io/d, {Edi/i(7, 

 Cli/aiiiydosai/rits, IFciiiisphccriodon. 



2. A western, central and southern group, represented by Diplodaciyliis, 

 Ncphriiriis, Ainpliiholiinis, Midoili, Tyi)ipa)ioci\\plis, OphidiO(\phaI/n, Chclosauria. 



3. A scries of widely-spread genei'a repres(>ntcd by Pygnpi/s, Dcbna, Lia/is, 

 Ei^cniia, Trachysaiirus. 



Amongst the first of the groups it is noticealjle tliat there has been a certain 

 amount of passage from the north across the north-west and so to the west and 

 vice versa, whilst certain genera, such as A/zipIiiiic/iirits, are in the main charac- 

 teristic of one region, though they have certain species, such as in that genus A. 

 barbaius^ widely distributed over the continent. 



