The relationship between the palaearctic and nearctic faunas 



261 



Q. fuliginosus Gr 



Q. fulvicoUis Steph 



Q. nitipennis Steph 



Q. umbrinus Er 



Sipalia circellaris Gr 



Stenus brunnipes Steph. . . . 



S. canaliciilatus Gyll 



S. carbonarius Gyll 



S. clavicornis Scop 



S. coarcticollis Epp 



S. impressus Germ 



S. nanus Steph. (coll.). . . . 



S. nitidiusculus Steph 



Tachinus corticinus Gr. . . . 



T. riifipes DeG 



Tachyporus atriceps Steph. 



Pselaphidae 



Bythinus puncticoUis Denny 

 {validus Aube) 



Cantharidae 



Malthodes mysticus Kies. . . 



M. pumilus Breb 



{atomus Thorns.) 



Elateridae 



Hypnoidus riparius F 



Helodidae 



Helodes mimita L 



Byrrhidae 



Byrrhus fasciatus Forst. . . . 



Cytilus sericeus Forst 



Simplocaria tessellata Lee*. . 

 5*. semistriata F 



Crytophagidae 



Caenoscelis ? cryptophaga Reitt.' 



(b) 

 (b) 

 b 

 b 

 b 

 b 

 m 

 b 

 m 

 b 

 m 

 m 

 b 

 b 



( + ) 



+ 



+ 



+ 



( + ) 



( + ) 



+ 



( + ) 



including "types" from Greenland (Mus. Copenh.) and Brown's specimens from Baffin 

 Island (Mus. Ottawa), and of dicksoni Makl. from arctic Siberia, 1 1 localities, between the 

 mouth of River Yenisei and St. Lawrence Bay in the Bering Strait (Swed. Riksmus.), has 

 convinced me that they all belong to one species. The differences from brevilingue mentioned 



