Vol. XI] VAN DYKE— PRIBILOF ISLANDS COLEOPTERA 165 



21. Hypnoidus musculus Esch. 



Esch., Entomographien (1822), p. 70. 



Esch., Thon Entom. Archiv, II (1829), p. 33. 



Mann., Bull. Mosc, XVI (1843), (Sep. p. 66). 



One specimen. Taken in numbers previously by Professor 

 Kincaid. Found also on Unalaska and Kodiak islands, the Kenai 

 Peninsula, Wrangel Island, and Queen Charlotte Islands. 



CHRYSOMELID^E 

 22. Chrysomela subsulcata Mann. 



Mann., Bull. Mosc, XXVI (1853), p. 247. 



A large series, including specimens from both St. George and 

 St. Paul islands, the latter the type locality. They show a great 

 variation in color, ranging from brilliant green, through blue, 

 bronze, to black ; also in size and in sculpture, most of the speci- 

 mens having the elytral intervals subcristate with the striae deeply 

 impressed while others show intermediate degrees of development 

 to certain small specimens which have the intervals very flat and 

 the striae hardly indicated except by the punctures. The life his- 

 tory of this interesting willow-feeding species was described by 

 Kincaid 7 . It was not found on the Aleutian Islands, even 

 after a most careful search, but it has been reported from Popof 

 Island (Harriman Exped. 1900), and Camden Bay and Collin- 

 son Point, Alaska, Arctic Coast (Canad. Arctic Exped., 1919). 

 Related but distinct species are found on the opposite Siberian 

 Coast. 



eurystethid;e (^gialitid;e) 



23. Eurystethus (^gialities) californicus Mots. 



Mots., Bull. Mosc, XVIII (1845), p. 33. 



Debilis Mann., Bull. Mosc, XXVI (1853), p. 180. 



Seidlitz, Deutsch Ent, Zeit. (1916), p. 127. 



Van Dyke, Entom. News, XXIX (Oct., 1918), p. 307. 



Nineteen specimens, several of which have a much narrower 

 and more cylindrical prothorax and generally narrower after- 

 body, including the elytra, but otherwise not different. This 

 insect, perhaps the most distinctive of the North Pacific, has 



7 Harriman Alaska Expedition, Vol. VIII, Insects, Part I (1904), p. 199. 



