192 



by H. C. Fall ; Coccinellidae, Elateridae, Chrysomelidae, and 

 Rh}Tichophora by C. W. Leng ; and Dytiscidae by J. D. Sherman, 

 Jr. " 



The forest insects were collected chiefly on the east side of the Copper 

 Mine River, North-west Territories. The trees were stunted white 

 spruce [Picea olba], examined in February at a temperature of 50 

 degrees below zero. Forest insects including bark-beetles and Ceram- 

 bycid larvae had caused extensive injury. Mr. Johansen in his field 

 notes considered that they had killed the majority of the numerous 

 dead trees in that locality, and he suggests that the injuries to the 

 most northern trees, ascribed to fires and climatic conditions, may have 

 been really caused by similar insect outbreaks. The following Scoly- 

 tids are described : — Dendroctonus johanseni, sp. n., CarpJwborus 

 andersoni, sp. n., Polygraphus rufipennis, Ky., which is usually rare 

 in pine but is commonly foimd in larch in Canada, and Pityophthorus 

 iiitidus, Sw. 



The only Cerambycids obtained in the extreme north were: — 

 CriocepJialus agre^tis, Kirby, Merium proteus, Kirby, Neodytus murica- 

 iulus, Kirby, and Xylotrechus undulatiis, Say. A new species, Gallidium 

 subopacum, is described from Yukon territory. 



Gibson (A.). The Lepidoptera collected by the Canadian Arctic 

 Expedition 1913-18, — Rept. Canad. Arctic Exped. 1913-18, 

 Ottawa, 10th January 1920, iii, : Insects Pt. I : pp. 1-58, 5 plates. 

 [Received 8th March 1920.] 



The greater part of the collection here described was made by the 

 Southern Party from 1913 to 1916, and consists chiefly of butterflies. 

 A small collection was made by the Northern Party and in addition 

 a record is given of species that have been collected in Arctic regions 

 by ofiicials of the Geological Survey of Canada. 



Strickland (E. H.). The Date on which it is safe to re-seed Fields 

 in the Prairie Provinces after they have been devastated by 

 Cutworms. — Canada Dept. Agric, Entom. Branch, Ottmva, Crop 

 Protection Leaflet 11, [n. d.], 2 pp. [Received 8th March 1920.] 



A chart and directions are given for measuring cutworms in order 

 to ascertain how long it will take for them to become full grown. 

 The importance of this lies in the fact that if they have destroyed one 

 crop, they will do an equal amount of damage to another imless they 

 have ceased to feed. If they average f inch long, fields should not be 

 sown in less than 5 weeks, if | inch 4, if 1 inch 3, if IJ inch 2, and if 1^ 

 inch (full grown) 1 week. 



The pale western cutworm [Porosagrotis orthogonia] does not leave 

 destroyed fields, but the red-backed and army cutworms [Euxoa 

 ochrogaster and E. agrestis] may sometimes do so. If it is certain 

 they have left, it is safe to re-seed at any time. 



Early sown crops suffer less than those sown late, and cutworms are 

 ahnost always worst on summer- fallowed land. Flax suffers as much 

 as grain from cutworms. Rain does not kill them, but reduces the 

 extent of their feeding. 



