176 SCHWARZ [5 2 8] 



Agabus semipunctatus Kirby. 



Popof Island, July 16, i specimen. 

 Agabus scapularis Mannerheim. 



Popof Island, July 5, 9, 10 and 16, 24 specimens. 

 Agabus lecontei Crotch. 



Kukak Bay, July I, 2 specimens; Popof Island, July 10, 2 

 specimens. 



Rhantus binotatus Harris. 



Fox Point, July 2, i specimen; Sitka, June 16, i specimen. Both 

 specimens are females, and the determination is therefore not quite re- 

 liable. 



Rhantus bistriatus Bergst. 



Popof Island, July 13, i specimen. A single female but no doubt 

 belonging to this species. Has not been reported before from Alaska. 



Dytiscus dauricus Gebler. 



Popof Island, July n, a single female specimen with sulcate elytra. 



Family GYRINIDJE. 

 Gyrinus picipes Aub. 



Yakutat, July 21, 5 specimens; Kukak Bay, July i, i specimen. 



Family HYDROPHILIDJE. 

 Helophorus auricollis Eschscholtz. 



Popof Island, July 12, I specimen. Hitherto reported only from 

 Unalaska. 



Helophorus inquinatus Mannerheim. 



Kukak Bay, July i, 5 specimens. 

 Cercyon fimbriatus Mannerheim. 



Kukak Bay, July 5, 3 specimens (black form). 

 Cercyon fulvipennis Mannerheim. 



Farragut Bay, June 5, i specimen. 

 Cercyon lugubris Paykull. 



Sitka, June 16, i specimen. This has not been recorded before 

 from Alaska but there is no doubt that Cybocephalus ? unicolor Mots., 

 described from the same locality (Bull. Moscou, 1845, vol. IV, p. 

 364) is to be referred to this cosmopolitan species. 



