INTRODUCTION II 



mostly Diptera, and among them were the following Syr- 

 phidse : Melanostoma mellinum (L.)> Syrphus contumax O. S., 

 Syrphus glacialis (Johnson), Helophilus dychei Will., and 

 Eristalis tenax; Empidas : Rhamphomyia setosa Coq., Hil- 

 ara transfuga Walk. ; Scatophagidae : Scatophaga islandica 

 Becker, Cordylura vittipes Loew, Cordylura prausta Loew ; 

 Phoridas : Trineura aterrima (Fabr.) ; Anthomyidte : Hyeto- 

 desia brunneinervis (Stein), Homalomyia Jlavivaria sp. nov. 

 Coq., and Phorbia biciliata sp. nov. Coq. Resting upon the 

 under surfaces of the leaves of the same plant, but never appear- 

 ing on the flowers, were vast numbers of a species of Psy- 

 chodidas, Pericoma bipunctata Kin., originally described from 

 Washington and California. 



The willows also were well supplied with visitors, among 

 which may be mentioned the following Mycetophilidae : 

 Bolelina grcenlandica Staeger ; Bibionidse : Bibio variabilis 

 Loew, Dilophus scrralicollis Walk. ; Syrphid^ : Syrphus gla- 

 cialis (Johnson), Melanostoma mellinum (L.) ; Empidae : Rham- 

 phomyia albopilosa sp. nov. Coq. In sweeping among the 

 herbage three species of Tipulidas were netted Tricyphona 

 diaphana Doane, Dicranota argentea Doane, and Tipula tene- 

 brosa sp. nov. Coq. 



Resting among the foliage of the willow bushes were several 

 saw-flies, including Dolerus sericeus Say and Tenthredo vari- 

 picta Nort., while at the blossoms of the same plant occurred 

 the bumble-bees Bombus melanopygus Nyl. and Psithyrus 

 insularis (Smith). 



On the afternoon of June 10 an effort was made to climb one 

 of the high hills to the left of the glacier, where the steep slope 

 rises to the height of about two thousand feet. For some dis- 

 tance the hillside was dotted with clumps of alders and dwarf 

 willows. At the blossoms of the latter bumble-bees were com- 

 mon, and here also was taken a single male specimen of Andrena 

 frigida Smith, noteworthy as the first of the solitary bees to be 

 discovered in Alaska. On the same slope were found the first 

 butterflies of the Expedition, Pieris napi bryonice Ochs., as well 

 as two moths, Petrophora borealis Hulst and Phoxoptcris kin- 

 caidiana sp. nov. Fernald. 



