THE NORTH AMERICAN SPIDER FAUNA 261 



Aulacocyba subitanea Cam- 

 bridge 



Caledonia evansi Cambridge 

 Tiso aestivus L. Koch 

 Centromerus silvaticus Black- 

 wall 



(syn. Microneta quinque- 

 dentata Emerton) 

 Macrargus multesimus Cam- 

 bridge 



(syn. Microneta discolor 

 Emerton) 



Typhochraestus borealis Jack- 

 son 



Cornicidaria karpinski Cam- 

 bridge 



Walckenaera vigilax Black- 

 wall 



Gonatmm rubens Blackwall 

 Erigone dentipalpis Wider 

 Erigone atra Blackwall 

 Erigone arctica White 

 Erigone tirolensis L. Koch 

 Erigone psychrophila Thorell 



Erigone sibirica Kulczynski 

 Erigone longipalpis Sundevall 

 Diplocentria bidentata Em- 

 erton 

 Coryphaeolana holmgreni 



Thorell 

 Coryphaeolana lapidicola 



Soerensen 



Coryphaeolana thulensis Jack- 

 son 



Maso sundevalli Westring 

 Hilaira frigida Thorell 

 Hilaira glacialis Thorell 

 Zornella cidtrigera Koch 

 Oreonetides vaginatus Tho- 

 rell 



Rhaebothorax morulus Cam- 

 bridge 



hlandiana alata Emerton 

 Trichopterna mengei Simon 

 (syn. Pelecopsis excavatum 

 Emerton) 



Microcentria rectangulata 

 Emerton 



Missing from this list are the following species, which, long re- 

 garded as the same in the two regions, must be excluded from the 

 list since the original records were based on misidentifications: 

 Amaurobius claustrarius Hahn, Loxosceles rufescens Dufour, Cal- 

 lilepis nocturna Linnaeus, Crustulina guttata Wider, Episinus trun- 

 catus Latreille, Pityohyphantes phrygianus Clerck, Linyphia 

 clathrata Sundevall, Theridiosoma gentmoswn L. Koch, Aranea 

 angulata Linnaeus, and Arctosa cinerea Fabricius. 



This exclusion does not rule out the real possibility that these 

 species may be listed legitimately when new evidence is available. 

 No authentic specimen of Aranea angulata has ever been taken in 

 the United States or Canada, and all previous records refer to one 

 or several related species. Many years ago Emerton recorded Ara- 

 nea quadrata from New England, but withdrew the record when 

 it was found that his specimens were in reality trifolium. Several 

 seemingly authentic specimens of the former have now been found 



