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. Dendroclonus johanseni Sw. 
The drawings are by Mr. A. E. Kellett, Artist Assistant, Entomological Branch, Department 
of Ag.'i(!ulture, Ottawa. 
