ROEBUCK : VARIATION IN LEHMANNIA ARBORUM. 279 



Var. pal lens Less. & Poll. 



' Animal pallescens, dorso zonula pallida^ et usque ad Yz 

 longitudinis carinato ; clypco pallido zo?iis obscuris subobso- 

 letis: (Less. & Poll., 1882). 



Found at an elevation of 1653 metres [=5423 feet] 

 on the Alpe di Devero, valle d'Antigorio, Piedmont. 

 (Less. & Poll, 1882). 



/ Var. ruplcola Less. & Poll. 



' Animal minor, nigricans ; zonula pallida dorsali 

 obsoleta vel nulla, carina subtilissijna ad ^ dorsi producta, 

 clypeo subunicolore vel omnino nigro.' (Less. & Poll., 1882). 



Found in the Piedmontese Alps, especially in the 

 elevated regions. This variety ascends to nearly 2500 

 metres [=8200 feet] at the Col d'OUen, Gressoney slope, 

 and of all the Italian slugs is the one that reaches the 

 greatest elevations. (Less. & Poll., 1882). 



The Rev. H. W. Lett sent me in the middle of October, 

 1884, some slugs which he had taken at Newcastle, county 

 Down, Ireland. Among them was an individual of Li)?iax 

 arborufu, which was black-brown in colour, with the shield 

 nearly unicolorous and with the pale dorsal line practically 

 obsolete, and which agreed with Lessona & PoUonera's 

 description of var. rupicola in every character but that of the 

 keel, which was of the normal length or equal to about one- 

 third the length of the back. 



It may be as well to mention here that the counties from 

 which I have had the opportunity of seeing specimens oiLehmati- 

 nia arborum are as follows : — 



I, Cornwall West ; 11, Hants South ; 12, Hants North ; 13, 

 Sussex West ; 18, Essex South ; 20, Hertford ; 23, Oxford ; 

 27, Norfolk East (shell only); 33, Gloucester East ; 34, Glouces- 

 ter West ; 37, Worcester ; 38, Warwick ; 48, Merioneth ; 49, 

 Carnarvon; 50, Denbigh ; 56, Notts ; 57, Derby; 62, York 



