THE CANA.DIA.N ENTOMOLOGIST. 451 



10. Ae. Nevadensis. — -A series of eight males from Reno, Nevada, 

 are the only specimens seen. 



'I'lie characters by which Ae. interna, lineata and Nevadensis are 

 separated are so slight that it is by no means improbable that intermediate 

 forms may be found. The first two named forms, however, are certainly 

 characteristic of different geographical provinces, and although a consider- 

 able series of both has been examined, no intergrades have been seen. 

 There seems to be no constant character for the separation of the females. 



11. Ae. eremita {'''Ae. X," Williamson). — A very distinct species 

 belonging to the wooded parts of ihe Boreal Zone from Labrador, New- 

 foundland and the White Mountains to the Hudson's Bay Slope, Great Slave 

 Lake and Alaska, thence southward in the Rocky Mountains to Wyoming. 



It occasionally wanders into the Transition Zone. 



12. Ae. clepsydra. — Upper Austral and Transition Zones, from New 

 England to Ontario and Indiana. 



13. Ae. Canadensis ('^Ae. K," Williamson). — Next to Ae. umbrosa this 

 is the commonest Aeshna in collections, and is generally known as Ae. 

 clepsydra. It is an abundant species in the Canadian division of the 

 Boreal Zone, and is also common in the Transition Zone, from New 

 England and the Maritime Provinces to Manitoba. Typical examples 

 from Washington Territory have also been examined, and its range is 

 therefore probably continuous from Atlantic to Pacific. 



14. Ae. verticalis. — Very closely allied to Ae. Canadensis, but 

 undoubtedly distinct. It inhabits the Transition and Upper Austral Zones 

 east of the Mississippi. 



15. Ae. tiiberculifera. — A somewhat rare species, very distinct from 

 any of the others. It has been taken in some numbers in the New 

 England States, especially in southern Maine, and a few specimens from 

 Ontario and Wisconsin have also been examined. 



16. Ae. juncea. — A circumpolar species found in America in the sub- 

 arctic forest bell, from Newfoundland to Alaska and south to the Wnite 

 Mountains, northern Ontario and in the Rocky Mountains to southern 

 Colorado. 



17. Ae. subarctica. — Boreal Z)ne, from Anticosti and Nova Scotia to 

 Isle Royale, Mich., and the north shore of Lake Superior. 



18. Ae. sitchensis. — Boreal Zone, from Newfoundland, thrjugh 

 Quebec, northern Ontario, northern Michigan and Minnesota to Alaska. 



19. Ae. septe?iirionalis. — Hudsonian division of the Boreal Zone, from 

 Labrador, Newfoundland and the WHiite Mountains to Great Slave Lake. 



