Vol. XII VAN DYKE— PRIBILOF ISLANDS COLEOPTERA 161 



alaska, and Akutan of the Aleutian Islands, on Kodiak, and the 

 Alaska Peninsula, and extends across the continent and as far 

 south on the Atlantic Coast as New Jersey, down the Rocky 

 Mountains to New Mexico, and along the Pacific Coast as far 

 as middle California. 



DYTISCID^ 



10. Agabus hypomelas Mann. 



Mann., Bull. Mosc, XVI (1843), p. 221 (Sep. p. 97). 



Var. irregularis Mann., Bull. Mosc, XXVI (1853), p. 72. 



Twelve specimens, including some from both St. George and 

 St. Paul islands. It is found also on Unalaska Island, Alaska 

 Peninsula, Kodiak Island, Kenai Peninsula, Sitka, and Vancouver 

 Island. The specimens from the Pribilofs are slightly darker 

 than those seen from Unalaska. 



11. Laccophilus decipiens Lee. 



Lee. Anns. Lye. Nat. Hist. N. Y., V (1851), p. 205. 



Truncatus Mann., Bull. Mosc, XXVI (1853), p. 68. 



Calif omicus Mots., Bull. Mosc, XXXII (1859), II, p. 172. 



This species is listed from St. George Island as well as the 

 Kenai Peninsula, on the authority of Mannerheim, but it has 

 not been found farther north than British Columbia in recent 

 years. It is a common species in both Oregon and California. 

 T would questionably admit of its being Alaskan until verified. 



silphid;e 



12. Lyrosoma opacum Mann. 



Mann., Bull. Mosc, XXVI (1853), p. 175. 



Sahib. J., Vega Exped. (1885), p. 66. 



Numerous specimens from both St. George and St. Paul 

 islands. It is a widely distributed species in Bering Sea, being 

 found on Bogoslof, Atka, Unalaska, and Bering islands ; it is also 

 found on Afognak Island. It lives in the rotting kelp and is at 

 times completely submerged by the tides. 



