1908] Dragonflies of the Ottawa District 21 



though elsewhere in Canada it is known only from Algonquin 

 Park. 



The violet color of the males distinguishes them from all 

 our other Agrionidae, and the species is further distinguished 

 from A. puirida by the smaller size and shorter pterostigma, 

 which surmounts but one cell, that of putriJa covering H cells 

 or more. 



In habitat violacea resembles the species of Lestes, Enal- 

 lagma, etc., rather than our other Argias, being found about the 

 marshy borders of slow streams and lakes. 



Genus Chromagrion, Needham. 



9. Chromagrion conditum (Hagen), Needham. Fig. F. 



Ottawa, 2 males (Harrington); Hull, June 6th, 1903, 1 

 male (Harrington); July 17th, 1907, 1 male (Letourneau). 



This pretty damsel-fly can be recognized by the form of 

 the male appendages and the coloration. The thorax is light 

 blue wnth more or less ^^ellow on the sides and below, and has a 

 broad irregular mid-dorsal black band, but no lateral bands. 

 The abdomen is, for the most part, black, w:ith interrupted blue 

 basal rings, v.^hile segments 8 and 9 are almost entirelv blue. 



It is a somewhat longer and more slender insect than 

 Argia violacea v/hich it otherwise resembles in size. It does not 

 appear to be very common, although sometimes numerous 

 locally. 



Genus Nehalennia, Selys. 



10. Nehalennia irene (Hagen), Selys. 



Ottawa, 1 male, 1 female (Fletcher); June 3rd, 1903, 1 

 female (Harrington). 



A very sm^all delicate metallic-green species, with a blue- 

 tipped abdomen and narrow yellow or blue interrupted basal 

 rings on segments 3-6. The only other species in our fauna with 

 which it might be confused is A'', gracilis, whicl; we took last 

 summer in sphagnum logs at Go Home, Georgian Bay, Ont. 

 The tVv'O species are extremely similar in appearance, but in 

 gracilis the last two segments of the male are entirely blue; 

 in ireiie there is some bronze-green on the sides. The third 

 margin of the prothorax of the female is bilobed in gracilis, 

 trilobed in irene. 



N . i'-ene is generally abundant v/here it occurs, but on 

 account of its small size, green color and lov/ flight, it is usually 

 overlooked l)y the genr-rrl collector. 



11. Amphiagrion saucium (Burns), Selys. 

 Ottawa, June 20th, 1894, 3 males, 3 females (Fletcher). 



