32 ALASKA INSECTS 



Chrysomcla subsulcata Mann, was recorded from the Pribilof 

 Islands and not elsewhere ; a single specimen was found feed- 

 ing on a dwarf willow bush high up among the hills. 



The only butterflies observed during our stay were Picris 

 napi hulda Edw. and Brenthis frigga saga Staud. The latter, 

 of which five specimens were captured, makes its home in the 

 tundra. In habits it is very shy, since it will not fly till almost 

 stepped upon, and then it flutters for a short distance close to 

 the ground, quickly hiding itself in the thick moss. This butter- 

 fly is no doubt in constant danger of being blown away from its 

 island home, and its cautious habits are the result of natural 

 selection, which has operated to eliminate the more adventurous 

 individuals. 



The list of Popof moths comprises eighteen species, including 

 an Arctian, Platarctia parthenos Harr. ; six Noctuidee : Noctua 

 c-nigrum L., Hadcna ducta Gr., Pachnobia alaskcz Thunb., 

 Ommatostola popofensis sp. nov. Smith, and Anarte lanuginosa 

 sp. nov. Smith; six Geometridae : Mcsoleuca variata Schiff., 

 Petrophora montanata Borkh., Petrophora nemorclla Hulst, 

 Tephroclystis pcrfusca Hulst, Tephroclystis misenila Grt., and 

 Rheumaptera hastata L. ; two Pyralidte : Scoparia centuriclla 

 Schiff. and Crambiis interminclhts Walk. ; one Pterophoridse : 

 Platyptilia petrodactyla Walk. ; two Tortricidas : Sciaphila 

 moeschleriana Wocke. and Sericoris bipartitana Clem. The 

 Noctuids, almost without exception, were taken upon the umbels 

 of Hcraclcum. 



The list of Hymenoptera does not include any representatives 

 of the Sphegoidea. The Apoidea includes only members of the 

 genus J3ombus, of which five species were secured B. coupert 

 Cr., B. oregonensis Cr., B. pleurah's Nyl., B. sylvicoJa Kby., 

 and B. mixtuosus sp. nov. Ashmead. Bumble-bees were observed 

 to play an important role in the fertilization of many flowering 

 plants. They were noted in the act of visiting the blossoms of 

 Geranium erianthum, Lupinus nootkatensis, Polcmonum c<zr- 

 uleum, Mimulus langsdorjfii, Pcdicularis langsdorjfii, Castil- 

 leja pallida, and Hcracleum lanatum. 



The number of saw-flies was exceptionally large, comprising 

 19 species, the gall-producing forms predominating. The list 



