26 ALASKA INSECTS 



lugubris Staud. being the most abundant. Several specimens 

 of this moth were captured with the pollinia of Habenaria cling- 

 ing to their heads. The remaining moths were three Pyralidae, 

 two Tortricidae, and a representative of the Sesiidae, Sesia culici- 

 formis L. 



The collection of Hymenoptera contained an interesting series. 

 There were three species of bumble-bees Bombus frigidus 

 Smith, B. sitkensis Nyl., and B. juxtus Cr. The Vespoidea 

 were better represented than at any other locality visited by the 

 Expedition, examples of three families being taken, as follows 

 Pompilidse : Arachnophila se-ptentrionalis sp. nov. Kincaid 

 (at umbels of Heracleum) ; Vespidas : Vespa marginata Kirby ; 

 Eumenidae : Odynerus albophaleratus Sauss. (also at flowers of 

 Hcracleum) . The Sphecoidea were represented by a Crabronid, 

 Thyreopus vicinus (Cr.), taken at the same blossoms. 



The Tenthredinoidea included seventeen species, of which 

 two-thirds were new. The list comprises representatives of the 

 genera Fenusa; Paraselandria ; Pachynematus (two species); 

 Pristiphora (three species); Pontania (two species); Dolerus; 

 Emphytus; Trichiosoma {T. triangulutri) ; and Tenthredo (five 

 species T. ferrugineipes Cr., T. varipicta Nort., T. nigri- 

 collis Kirby, T. erythromera Prov., and T. dissimulans sp. nov. 

 Kincaid). 



The list of parasitic Hymenoptera as determined by Mr. 

 Ashmead comprises 21 species, of which 15 were new, includ- 

 ing a new genus (Harrimaniella). 



Of Diptera 68 species were captured. As usual the Empidas 

 and Syrphidae were well represented, the former by 9, the latter 

 by 14 species. In these families the more interesting captures 

 were Empis poplitea sp. nov. Coq., Hilara aurata sp. nov. 

 Coq., Hilara quadrivittata Meigen (a European species not 

 previously recorded from America), Chilosia pulchripes Loew, 

 Platychirus tenebrosus sp. nov. Coq., Syrphus torvus O. S., 

 Syrphus geniculata Macq., and Volucella facialis Will. 



Perhaps the most striking feature in the Diptera collected at 

 this point was the surprising number of Dolichopodidae, nine 

 species in all, including two not found at any of the other 

 stations Dolichopus lobatus Loew and Porphyrops consobrinus 



