INTRODUCTION 



mostly Diptera, and among them were the following — Syr- 

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

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

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

 ar a transfuga Walk. ; Scatophagidae : Scatophaga islandica 

 Becker, Cordylura vittipcs Loew, Cordylura prceusta Loew : 

 Phoridae : Trineura atcrrima (Fabr.) ; Anthomyidte : Hycto- 

 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- 

 chodidce, Pericoma bipunctala 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 ; Bibionidae : Bibio variabilis 

 Loew, Dilophus serraticollis Walk. ; Syrphidae : Syrphus gla- 

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

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

 herbage three species of Tipulidae were netted — Tn'cyfi/wna 

 diaphana Doane, Dicranota argentea Doane, and Tijmla tene- 

 brosa sp. nov. Coq. 



Resting among the foliage of the willow bushes were several 

 saw-flies, including Dolerus scriceus Say and Tcnlhredo vari- 

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

 the bumble-bees Bomb us melanopygus Nyl. and Psithyrus 

 insular is (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, Picris napi bryonia Ochs., as well 

 as two moths, Pctrophora borealis Hulst and Phoxopteris kin- 

 caidiana sp. nov. Fernald. 



