32 ALASKA INSECTS 



Chrysomela 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 Pieris 

 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, Platarclia -parthenos Harr. ; six Noctuidae : Noctua 

 c-nigrum L., Hadena ducta Gr., Pachnobia alasktz Thunb., 

 Ommatostola popofensis sp. nov. Smith, and Anarte lanuginosa 

 sp. nov. Smith; six Geometridas : Mesoleuca variata Schiff., 

 Petrophora montanata Borkh., Petrophora nemorella Hulst, 

 Tephroclystis perfusca Hulst, Tephroclystis misertila Grt., and 

 Rheumaptera hastata L. ; two Pyralidae : Scoparia centuriella 

 Schiff. and Crambus interminellus Walk. ; one Pterophoridae : 

 Platyptilia petrodactyla Walk. ; two Tortricidae : Sciaphila 

 moeschleriana Wocke. and Sericoris bipartitana Clem. The 

 Noctuids, almost without exception, were taken upon the umbels 

 of Heracleum. 



The list of Hymenoptera does not include any representatives 

 of the Sphegoidea. The Apoidea includes only members of the 

 genus Bombus, of which five species were secured B. coupen 

 Cr., B. oregonensis Cr., B. pleuralis Nyl., B. sylvicola 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, Polemonum car- 

 uleum, Mimulus langsdorffi, Pedicularis langsdorffii, Castil- 

 leja pallida, and Heracleum lanatum. 



The number of saw-flies was exceptionally large, comprising 

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



