16 ALASKA INSECTS 



The Apoidea were represented almost exclusively by mem- 

 bers of the genus Bombus (B. californicus Smith and B. 

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

 insularis (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 (Dal/alorrca). 



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 Lydidas 

 was represented by three species Itycorsia marginiventris 

 Cr., Ce-phalcia nigropcctus Cr., and Bactroceros sitkensis sp. 

 nov. Kincaid ; the Selandriida? by Erythraspidcs ashmeadii sp. 

 nov. Kincaid and Pixcilostomidea maculata Nort. ; the Nematidas 

 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- 

 rugtneipes Cr., T. 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 Herniptera, as was the case at most points, were 

 poorly represented. Of Heteroptera only three were seen 

 Irbisia sericans Stal., Scolopostcthus thompsoni Reuter, and 

 Corisa pr<zusta 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. 



