Vol. XI] VAN DYKE— PRIBILOF ISLANDS COLEOPTERA 159 



Colorado, through the Cascades and Sierra Nevada Mountains 

 to Lake Tahoe, and along the lowlands of the West Coast as far 

 south as middle Washington. In the old world, it extends from 

 the Scandinavian Peninsula and Scotland eastward across north- 

 ern Europe and Siberia to Bering Strait. It varies considerably, 

 and as a result, a great number of varieties and so-called species 

 have been erected at its expense. Very large series, however, 

 from many localities, show that they all grade one into the other. 



4. Pterostichus hyperboreus Mann. 



Mann., Bull. Mosc, XXVI (1853), p. 127. 



Menetr., Kafer Russl., p. 54. 



A large series, mostly from St. George Island, though with 

 a few from St. Paul, and containing typical as well as atypical 

 examples. The typical have the area within the hind angles of 

 the pronotum convex and impunctate ; in the atypical, the same 

 area is more or less flattened and irregularly punctured. All de- 

 grees of variation are observable. The series shows that this 

 species, like all of the others of the subgenus Cryobius, is ex- 

 ceedingly variable. The color ranges from a metallic green 

 through violet and bronze to black, the last found generally in 

 the older and more rubbed individuals. In its limited sense, this 

 species is restricted to the Pribilof Islands, but it is, in reality, 

 little more than a geographic race or subspecies of P. ventri- 

 cosus Esch. of Unalaska; the same is true of the more widely 

 distributed mainland form, P. vindicatus Mann. 



5. Pterostichus hudsonicus Lee. 



Le Conte, Proc. Acad. Nat. Sci. Phila. (1873), p. 315. 



A good series with representatives from both St. George and 

 St. Paul islands. This variable species is not found on the Aleu- 

 tian Islands, but ranges, on the mainland, from the Seward Penin- 

 sula, Alaska, to Labrador, Mt. Washington, N. H.. and Lake 

 Superior. 



