16 ALASKA INSECTS 



The Apoidea were represented almost exclusively by mem- 

 bers of the genus Bombus (B. calif or nicus Smith and B. 

 alaskcnsis sp. nov. Ashmead). These, together with Psithyrus 

 insular is (Smith), occurred at the blossoms of the salmon-berry. 

 A solitary female specimen of Andrena frigida Smith was 

 swept from the catkin of a willow, and thus furnished a com- 

 panion in the collection for the male of the same species taken 

 a few days previously at the Muir Glacier. 



Of the Ichneumonoidea, a rather small series was secured, 

 comprising only 17 species; but of these only five were pre- 

 viously known, the remaining twelve having been described as 

 new by Mr. Ashmead. One of them was made the type of a 

 new genus (Dallatorrea). 



The Tenthredinoidea seem to thrive in these northern regions 

 better than their higher relatives, since sixteen species were ob- 

 tained by sweeping among the shrubbery. The family Lydidae 

 was represented by three species Itycorsia marginiventris 

 Cr., Cephaleia nigropectus Cr., and Bactroceros sitkensis sp. 

 nov. Kincaid ; the Selandriidas by Erythraspides ashmeadii sp. 

 nov. Kincaid and Pcecilostomidea maculata Nort. ; the Nematidae 

 by Pachynematus ocreatus Hgtn., Pristiphora lena sp. nov., 

 and Pteronus rivularis sp. nov. Kincaid ; the Tenthredinidae by 

 Dolerus sericeus Say and seven species of Tenthredo: T.fer- 

 rugineipes Cr., Z! varipicta Nort., T. evansii Hgtn., T. lineata 

 Prov., T. nigricollis Kby., T. erythromera Prov., and T. mela- 

 nosoma Hgtn. These large and beautiful saw-flies form a most 

 conspicuous feature of the insect fauna. 



Of the Neuropteroids eight species were encountered, mostly 

 forms known to exist in other regions of America, the only ex- 

 ception being a caddice-fly described by Mr. Banks as Limne- 

 philus harrimani. 



The Hemiptera, as was the case at most points, were 

 poorly represented. Of Heteroptera only three were seen 

 Irbisia sericans Stal., Scolopostethus thompsoni Reuter, and 

 Corisa prceusta Fieber. The Homoptera were more nu- 

 merous, seven species of leaf-hoppers comprising the list, but 

 all of these were previously known from other sections of 

 America. 



