1922. No. 5. ARIONIDAE OF NORWAY. 29 



Var. alba Esmark, Nyt Mag. Naturvid., vol. 27, 1882, pag. 98. White, 

 the back pale grey. 



This variety is endemic in Norwa}', where only Birgithe Esmark and 

 Z. A. HoYER have found it in scattered localities (Tonset in Østerdalen, 

 Lille Lombolen in Maalselvdalen, Tromso and the Porsanger fjord). 



Distribution. Of the five Norwegian Arions Arioii sita/iisciis has the 

 largest range, it being found all over Europe with exception of the most 

 southern and south-western parts. From the arctic ocean it is distributed 

 to the River Ebro and the Alps. It has been recorded from Montenegro 

 and Rumania. Towards the east there are no reliable statements east of 

 Ural (SiMROTH 1 90 1 1, and at least for the present the limit must be drawn 

 from that chain of mountains southwards from Orenburg via Charkow to 

 the Trans-Sylvanic Alps. 



Outside the continent the species is common in the British Isles. 

 It has been recorded from Iceland, and a specimen has been found 

 even in Greenland, though problably introduced with cabbage from Den- 

 mark (MoRCH 1868 a I. The occurrence in Madeira must be assumed to 

 be due to introduction by man, and the same cause is still more evident 

 for its appearance in New-Zealand and in some eastern states of N o r t h 

 America. 



In Norway, where it was first recorded by Joachim Friele (1853), 

 Arion siibfiisciis has the greatest distribution of the species of this genus 

 (map 2). Even if the investigations are not so detailed as might be desired, 

 yet the localities are scattered all over the countr}'. 



In accordance with the northern range of the species, it is found at a 

 considerable height above the sea. Thus I have collected large specimens 

 (up to 7 — 8 cm. in length) near Finse, 1250 m. above the level of the sea. 



„Var. ; incdius. 



Af de fundne 3 Exemplarer er de 2 af folgende Farve : 



I det Hele taget lyse, hvidagtige, med Hovedet og de 4 Folehorn kulsorte. 

 Skjoldet hvidagtig gulgrønt, i det ovre midtre Parti med fin, sortagtig Stroning. Uden- 

 for og langsmed dette morkere Parti, adskilt derfra ved en smal del af Grundfarven, 

 findes to, vistnok ei stærkt udprægede, men dog tydelige, sort- 

 agtige Sidebaand. Ryggen : Vorterne blaafioletagtig hvide med lysegron Spætning, 

 Furerne mellem Vorterne morkere blaafiolette ; langs hver Side gaar fra Skjol- 

 det en ganske svag sortagtig Streg, som taber sighenimodden 

 bagre Ende. Fodbræmmen hvid med sorte Tværlinier, der dog ikke er fuldt 

 udprægede (paa det ene Exemplar kun antydede). Foden hvid. Slimet gulagtig (gul- 

 grønt, synes mig). Længde i sammentrukket Tilstand 16 mm. 



Det 3die Exemplar ligner de 2 foregaaende, men er noget storre, og den hos de fore- 

 gaaende beskrevne Farve er morkere ; dog er de 4 Folehorns og Hovedets kulsorte Farve 

 vel udpræget fra det bagenfor liggende hvidagtige Parti af Kroppen. S i d e b a a n - 

 dene findes antydningsvis paa Skjoldet, men mangle aldeles paa 

 Ryggen. Fodbræmmen med meget tydelige sorte Tværstreger. 



Alle tre fundne sammen ved Stranden af Glamslandsvandet nær Lillesand, ^I/y 72". 



