The relationship between the palaearctic and nearctic faunas 



233 



(From Rosenberg, Faglari Sverige.) 



FIG. 28. Breeding area of the Gannet, Mortis (Sula) bassaniis L., about 1940. Size 

 of dots in four categories, indicating colonies of less than 100 pairs, 100-1,000 pairs, 

 1,000 to 10,000 pairs, and more than 10,000 pairs, respectively. 

 (After Fisher & Vevers, 1943.) 



C. Less pronounced Amphiatlantic species, lacking in Asia (as far as known) but 

 Transamerican. 



Lepidoptera 



Anarta leucocycla Stdgr. W 

 A. melanopa Thunb. 



Araneae 



Cbibiona norvegica E. Str. W 

 C. trivialis C. L. Koch 

 Dictyna annultpes Blackw. W 



Diplocentria bidentata Em. 

 Gnaphosa or lies Chamb. W 

 Islandiana alata Em. W 

 Leptyphantes complicatiis Em. 

 Pardosa saltuaria L. Koch 

 Pocadicnemis piimila Blackw. 

 Thanatus striatus C. L. Koch 



Other Arthropods may belong here but the absence of records from Asiatic 

 Russia is possibly due to insufficient knowledge. Instances zrt:—Cidaria ruberata 

 Frr. and Eupithecia gelidata Moeschl. (Lepidoptera), Aeschna subarctica Walk. 

 (Odonata). 



Doubtful cases 



In the above lists (A-C) of more or less pronounced Amphiatlantic animals a few 

 species have been omitted which were regarded as primary Amphiatlantic by 



