The Saw-flies (Tenthredinoidea) collected by the Canadian 

 Arctic Expedition, 1913-18. 



ALEX. D. MAcGiLLivRAY 1 . 



The specimens of Tenthredinoidea collected by this Expedition were secured 

 with one exception, by the entomologist of the expedition, Mr. F. Johansen. 

 When the material obtained is compared with that described by Kincaid, the 

 entomologist of the Harriman Alaska Expedition, a striking difference is noted. 

 There was secured from southern Alaska by the Harriman Expedition repre- 

 sentatives of eight groups, families and subfamilies. The collection of the 

 Canadian Arctic Expedition contains representatives of three groups, two of 

 which are represented by single species and specimens, which were collected at 

 Nome, Alaska. One of these belongs to a group not represented in the collection 

 of the Harriman Expedition, the Siricidse. All of the specimens from the 

 northern part of the Northwest Territories belong to the subfamily Nematinse 

 of the family Tenthredinidse. This restriction is further striking in that all the 

 species belong to those genera with cleft claws. The larvae of the species of 

 certain of the genera feed only upon willow, while in others the majority of the 

 species feed upon willow. 



Some of the new species 2 described on the following pages may prove to be the 

 same as some of the species described from the European fauna. There is less 

 liability for confusion and danger from recording species from our fauna that do 

 not belong to it by giving names to these species, and this method has been 

 followed. If later studies prove any of the species to be identical with species 

 described from Siberia or Europe, it will be a simple matter to record them as 

 synonyms. The length given in the case of the larvae is for individuals supposed 

 to be mature. The statements enclosed by quotation marks are from the original 

 notes prepared by Mr. Johansen, to whom I am indebted for reading the original 

 manuscript of this paper, and for many corrections and suggestions. 



The following suggestion of Mr. Johansen will be of great value to future 

 investigators and travellers collecting and breeding saw-flies in the Arctic 

 regions: "From my notes it is evident that no saw-fly imagines are found in the 

 Arctic outside of the months of July and August (9-10 weeks), a fact that I 

 think is worth mentioning in the report, so that one understands that the speci- 

 mens collected outside this period are all larvae or pupse." 



Urocerus flavicornis Fab. 



A single female collected at Nome, Alaska, specimen No. 83F, This- 

 specimen differs from the description of Bradley in that it has the first and sixth 

 and part of the seventh segment of the abdomen and the cornus yellow or 

 brownish instead of the second, seventh, eighth, and sometimes the first more or 

 less. 



"A big woodwasp (Teredo) caught this summer 1916, in the town of Nome, 

 Alaska, was given to me here. It probably had been imported (as larva or 

 pupa) from the states with lumber, and then emerged in Nome later" Bradley 

 reports this species from Alaska and Siberia. 



Contributions from the Entomological Laboratories of the University of Illinois, No. 56. 

 2 The types of all new species described in this report are deposited in the National Collection 

 of Insects, Ottawa. 

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