230 



THE CANADIAN ENTOMOLOGIST 



reflections, a brownish creamy spot on each side. Vertex and 

 occiput almost black, rear of head black. See PI. XIII, fig. 9. 



Prothorax hidden by the heavy, white pile on the rear of the 

 head and on the mesothorax. 



Mesothorax and metathorax metallic green with coppery re- 

 flections on the lower end of the mesepisternum and the infraepis- 

 terna. Coxae and all legs black. A suggestion of creamy along 

 the alar edge of the mesepisternum. An obscure, narrowly ellip- 

 tical, yellow spot on the posterior edge of the mesepimeron above 

 the metathoracic spiracle. Entire thorax covered with long, 

 creamy pile. Wings hyaline. Pterostigmata pale brown. 



Fig. 10. — Somatochlora sefttentrionalis. 



1. Appendages of male, Somer (Coll.), Labrador, M. C. Z. 



2. Appendages of male, Grand Lake, Nfd., Williamson. 



3. Appendages of male, Winthern (Coll.), Labrador, M.C.Z. 



4. Appendages of male, Hudson's Bay, Carnegie Mus. 



Abdomen with segments 1-3 and 10 black with metallic green 

 reflections, segments 4-9 pure black except the intersegmental 

 membranes 2-3 and 9-10, and the triangular yellow spot on the 

 lower anterior edge of segment 3. 



Structure. — This is a short, heavy species. Occiput large, 

 reaching half way to the vertex. Lateral keel on segments 4-8. 



