4G0 MK. W. B. ALEXANDER ON THE 



Introduced Mammals. 



Stokes found great numbers of rats on Kat Island, but it is not clear 

 whether these were Ratlus (Epimys) fuscipes or R. rattus or R. norvegicus. 

 If they were from the latter they were presumably the result of one of the 

 numerous shipwrecks which occurred on the islands from 1629 onwards. 

 Bats are stated also to have occurred on Pelsart Island, but we did not meet 

 with them on either of these islands. Babbits also were formerly found on 

 Pelsart Island, though there is no evidence as to how they got there. 



Unfortunately, the domestic cat has been introduced. We saw an 

 individual on Hat Island and the tracks of one on Pelsart Island, and this 

 probably accounts for the disappearance of the rodents, as well as the larger 

 lizards, on these groups. It is to be hoped that they will not reach the 

 Wallaby Group. 



REPTILIA. 



Ophidia. B o i d m. 



Python spilotes variegatus (Gray). Carpet-Snake. Plentiful on West 

 Wallaby Island. The largest individual we met with was about 7 ft. in 

 length. 



Colubrid x. 



Denisomia CORONATA (Schleg.). Crowned Whip-Snake. The British 

 Museum has a specimen obtained by Gilbert. A small grey snake seen by 

 me on East Wallaby Island, but unfortunately not captured, was probably of 

 this species. 



Rhynchelaps bertholdi (Jan). Ringed Snake. Mr. Lipfert obtained 

 a specimen of this species on West Wallaby Island in 1895. A large example 

 obtained by the guano-workers was forwarded to Prof. Dakin in 1915, and 

 is now in the W.A. Museum. 



Lacertiiia. Geckonid2e. 



Gymnodactylus miliusii (Bory). Flat-tailed Gecko. Frequent on West 

 Wallaby Island ; also found on Pigeon Island. 



Heteronota bynoei (Gray). The types of this species, in the British 

 Museum, were obtained on Houtman's Abrolhos. 



Phyllodactylus marmoratus (Gray). The types, in the British Museum, 

 are from the Abrolhos. 



Phyllodactylus ocellatus (Gray). The types of P. lilineatus, Gray, 

 regarded by Boulenger as a synonym of this species, were obtained on the 

 Abrolhos. 



