24 E Canadian Arctic Expedition, 1913-18 



EXPLANATION OF PLATE IL 



Plate 1. Bark-beetles. 



Fig. 1. Carphoborus'andersoni Sw. 



Fig. 2. Polygraphus rufipennis Ky. 



Fig. 3. Pityophthorus nitidus Sw. 



Fig. 4. Pityophthorus nitidus Sw., declivity of elytra. 



Fig. 5. Pityophthorus nitidus Sw. 



Fig. 6. Dendroctonus jphanseni 8vf. 



The drawings are by Mr. A. E. Kellett, Artist Assistant, Entomological Branch, Department 

 of Agriculture, Ottawa. 



