50 The Ottawa Naturalist. [June 



(jenus LscnxuRA Charpcntier. 



This geiiu-^ is distinguished from Enallagma by the char- 

 acters given under the latter. 



Of the three specie? reported from eastern Canada, two are 

 found at Ottawa. 



15. Ischnqra posita (Hagen), Needham. 



Ottawa, 3 males. .3 females (pruinose) (Harrington, Taylor, 

 Fletcher). 



This little dragonfly may be known by its bronze-black 

 color, and the interrupted antehumeral thoracic band, in the 

 form of an !. The abdomen of the male is black with narrow 

 yellow basal rings on most of the segments'. The female is paler 

 and the antehumeral stripe not always interrupted. 



This is the first notice of its occurrence in Ontario, although 

 it has been reported from Quebec and is common in many parts 

 of the United States. 



16. IscHNURA VERTiCALis (Say), Selys. 



Ottawa, 3 orange females (Harrington, Ta\dor) ; Mer Bleue, 

 June 1st, 1903, 1 male (Gibson); Hull, July 13th, 1907, ] male, 

 1 black female, 3 pruinose females (Gibson); July 17th, 1907, 

 1 pruinose female, 1 orange female (Letourneau). 



A widely distributed and very common species, flying from 

 spring until autumn. 



The thorax of the male is yellowish -green, striped with 

 black, the abdomen black with pale blue interrupted basal 

 rings, and segments 8 "and 9 azure blue with a black stripe on 

 each side. A bifurcated process on the apical dorsal margin 

 of segment 10, together with the venational characters given, 

 will serve to distinguish it from certain sj^ecies of Enallapna. 

 which bear a slight resemblance to it in coloration. 



The female appears in two color varieties, the 'black female,' 

 colored like the male when young, and the 'orange female,' in 

 which the ground color is reddish-orange banded with bronze- 

 black. Both forms become pruinose when old, appearing then 

 as though covered with a dull bluish dust. The orange female 

 is the conmaoner form in the spring, the black in the summer. 

 The latter seems to become pruinose very soon after m.aturitv. 



Appendix to the Zygoptera. 



17. Lestes Forcipatus Rambur. 

 2 males (Maclaughlin). 



These are the first Canadian specimens I have seen, although 

 it has been recorded from Grimsby. Ont., and various parts of 

 British Columbia. 



