18 E Canadian Arctic Expedition, 1913-18 



Genus Galerucella Crotch. 



Galerucella decora Say. 



Langton bay (Franklin bay), Northwest Territories, 1910-11, V. StefSnsson 

 and R. M. Anderson, collectors; Nos. 1700 to 1704 and 1698 to 1699. 



Genus Haltica Geoff. 



Haltica bitnarginata Say. 



Langton bay, Northwest Territories, V. Stefansson and R. M. Anderson, 

 coUectors, 1910-11; No. 1631. 



Family DYTISCIDAE. 



By J. D. Sherman, Jr. 



Genus Hydroporus Clairv. 



Hydroporus humeralis Aube. 



Teller, Alaska, August, 1913, two specimens; Konganevik, Camden bay, 

 Alaska, June, 1914, three specimens; Demarcation point, Alaska, May, 1914, 

 five specimens; Bernard harbour. Northwest Territories, June, July, six speci- 

 mens. All collected by F. Johansen. A common, variable, Pacific coast species. 



Hydroporus tartaricus Lee. 



Collinson point, Alaska, September, 1913, seven specimens; Demarcation 

 point, Alaska, May, 1914, five specimens; Bernard harbour, Northwest Terri- 

 tories, May to August, five specimens; all collected by F. Johansen. 



Hydroporus sp. (Perhaps tristis Payk.) 



Bernard harbour. Northwest Territories, May, July, F. Johansen; two 

 specimens. 



Genus Coelambus Thorn. 



Coelambus unguicularis Cr. 



Bernard harbour. Northwest Territories, June, F. Johansen, collector; four 

 specimens. 



Genus Ilybius Er. 



Ilybius angustior Gyll. 



Teller, Alaska, August 1913, F. Johansen, collector; two specimens. Ex- 

 tremely common in Labrador. 



