THE CANADIAN ENTOMOLOGIST. 15 



ARCTIC SIRICOIDEA AND TENTHREDINOTDEA. 



BV W. HAGUE HARRINGTON, F. R. S. C., OTTAWA. 



The knowledge of our Arctic insect fauna is of so fragmentary a 

 character that any contribution thereto is of special interest and value to 

 Canadian entomologists. I am indebted to Dr. Hans Kiaer, of the 

 Museum of Tromso, Norway, for a copy of an exceedingly valuable 

 catalogue entitled " Die Arktischen Tenthrediniden,"* an examination of 

 which emphasizes this fact. His introduction points out that in Canada 

 little is known of the forms occurring north of St. Martin's Falls, Lat. 51'^, 

 whereas in Norway species are recorded from as far north as Lat. 70°. 

 Of 228 species enumerated (including 12 of Siricoidea) Arctic Scandinavia 

 furnishes 132, Nova Zemlya 18, Spitzbergen 6, Iceland 3, Greenland 2, 

 Hudson's Bay region 59, Alaska 8, and Arctic Siberia 11. There is but 

 one species common to Europe and America, and only 11 species in all 

 occur in any two of the above regions, showing that the circumpolar 

 fauna is not so cosmopolitan as is frequently supposed, although 

 undoubtedly some forms now listed as distinct species may prove to be 

 synonyms. Rhogogastcra viridis, Linn., is the sole link between the old 

 and new worlds. Slrex bizo7iatus, Steph., and .5*. caiidatjis, Cress., are 

 found in Hudson's Bay territory and in Alaska ; Cimbex /emorata, Zett, 

 TricJiiosoma luconim, Linn., and Nematjis iiii/iaris, Pan/., in Arctic 

 Scandinavia and Siberia; IV. arcticus, Holmgr., and N'. frigiJus, Boh., 

 in Nova Zemlya and Spitzbergen ; N. coiidjuius, Ruthe, and Emphytus 

 pallidipes, Spin., in Arctic Norway and Iceland, and N. obscuripes, 

 Holmgr., in Arctic Norway and Nova Zemlya. The percentage of 

 Nematids to other forms is very large in the boreal and arctic faunas, 

 and, apparently, increasingly so northward concurrently with changes in 

 the flora. From the Hudson's Bay region this group is as yet not nearly 



"Fauna Arctica. Eine Zusammenslellung der arkti.schen Tierformen, mit 

 besonderer Berucksichtigung des Spitzbergen-Gebietes aiif Grand der Ergebnisse der 

 Deutschen Expedition in das Nordlicher Eisnieer im Jahre, 189S. Band II., Lieferung 

 3, 1902. 



