430 Prof. C. Chilton on the Distribution of 



yet been recorded from tlie Cliatliams or any of the outlying 

 islands of New Zealand. 



From the notes given above it appears that Porcellio 

 scaler thrives best in the colder temperate regions of both 

 North and South Hemispheres, and becomes less abundant 

 as the warmer climates are reached. 



Dollfiis, in his " Isopodes terrestras du 'Challenger'^'*, 

 when recording tliis species from the islands of Juan Fernandez 

 and Tristan d'Acunha, has already drawn attention to the 

 fact that it is found in several widely remote localities in the 

 cold temperate regions of the south as well as the north, 

 although not found in the intermediate warmer regions, and 

 considers that its abundance excludes the idea of artificial 

 transport. I think, however, that the additional localities 

 now given are sufKcient to show that it has reached these 

 places in the south by accidental introduction, as already 

 explained. 



Porcellio Icevis, Latr. 



Porcellio Ifsvis, Budde-Lund, Isopoda Terrestria, p. 138. 

 Porcellio Icevis, Q. O. Sars, Crustacea of Norway, ii. p. 181. 

 Porcellio obtiisifrons, Haswell, Cat. Australian Crust, p. 280. 



Budde-Lund says of this species that it is without doubt 

 the most widely spread of all the Oniscidas, so that it seems 

 to be almost cosmopolitan. He does not record it, however, 

 from Australia, although it had been recorded from Sydney 

 under the name of Porcellio obtusifrons (a species that 

 Budde-Lund appears to have overlooked) by Haswellin 1882. 

 I have had specimens from Sydney for many years com- 

 pletely agreeing with HaswelPs description, and have no 

 doubt that they should be referred to P. Icevis. Besides 

 these I have specimens sent me by Mr. Sayce labelled 

 " From Garden," presumably from Melbourne, and in 1891 

 Mr. George Gordon sent me numerous specimens from 

 Geraldton, in Western Australia, most of them being slightly 

 larger than those from other localitie.'^. It is also to be found 

 in Norfolk Island and in New Caledonia, where, judging by 

 the number of specimens sent me by Monsieur V. Bouge, it 

 appears particularly abundant. Among these were several 

 albino or partially albino forms similar to those of which 

 Budde-Lund speaks as being found in Southern Europe. 



Jt is interesting to note that the species does not appear to 

 have yet reached New Zealand ; there is no record of its ever 



* Extr. Bulletin yociet^ d'Etudes scient. de Paris, xii^ Auneo, 1>90, 



