54 The Ottawa Naturalist. [June 



nomenclature of several species. Until the revision is published 

 it seems best not to make use here of the new names proposed, 

 so that most of the species listed belov/ are indicated onlv by 

 letters, the names by which thev are commonly known being 

 also given. These letters are the same as those used by William- 

 son in his paper "A collecting trip north of Sault Ste. Marie, 

 Ontario," (Ohio Naturalist, VII, pp. 130-148, 1907). 



Several other species besides those listed will almost cer- 

 tainly be found to inhabit the Ottaw^a district. 



2 5. Aeshna constricta. Say. 



Ottawa, July 26th, 1900, 1 female (Fletcher); 1 female 

 (Harrington). 



Anal triangle of inale 3-celled; superior appendages of male 

 with a prominent ventral spine near the tip ; no black line across 

 the face: first lateral thoracic band rather broad, its anterior 

 margin sinuate, not bordered with black; abdomen of male with 

 large blue spots; appendages of female, 7 mm. long, 2 mm. broad. 



A fairly common species in southern Ontario, but apparently 

 does not properly belong to the Boreal Zone. 



26. Aeshna Z. 



Ottawa, August 17th, 1907, 1 female (Fletcher); Hull, 

 beaver meadow, September 14th, 1907, 1 male (Letourneau). 



Closely allied to Ae. constricla and widely quoted under the 

 latter name, but distinct structurally as well as in coloration. 



Anal triangle of male 3-celled; appendages of male as in 

 constricta, no black line across the face; lateral thoracic stripes 

 narrower, straight, more or less distinctly bordered with black; 

 spots of male abdomen mostly small and greenish; appendages 

 of female 6-7 mm. long, 1-1.2 mm. broad. 



A very common species of wide range, frequenting small 

 streams and pools in the vicinity of woods. 



27. Aeshna Y. 



Ottawa, Julv 8th, 1899, 1 male (Gibson); 1 male, 1 female 

 (Harrington);' Hull, July 17th, 1907 1 male (Gibson). 



Anal triangle of male 2-celled; superior appendages of male 

 with a dorsal carina which bears a few denticles near the apex, 

 the latter acute and bent downwards; no black line across the 

 face; first lateral thoracic band green or bkie, strongly sinuate 

 in front and widened below; appendages of female about 5 mm. 

 long, 1 mm. broad. 



An abundant species in the Boreal and Transition Zones, 

 appearing early in July and common about lakes and slow 

 streams. It has been hitherto recorded as Ae. clepsydra. Say. 



