18 The Ottawa Naturalist. [April 



northward at least 30 miles beyond the Soo. The male is easily 

 known by its deep brown or black wrings, those of the female 

 being lighter brown, each with a white spot on the costal margin 

 near the tip. 



2. Calopteryx .??quabilis, Say. 



Ottawa, Hull, 2 males, 2 females (Gibson, Letourneau, 

 Harrington, Young). 



Length of body male, 50 mm., female, 52 mm. 



Length of hind wing . . " 32 mm., '" 36 mm. 



Width of hind wing. . . " 9 mm., " 10 mm. 



As seen from the measurements this is a larger insect than 

 C. maculata, and has relatively narrower wings. In the male 

 these are clear with the apical fifth or less of the front pair, and 

 about three-fifths of the hind pair black or dark brown, the 

 depth of color as in the preceding species deepening and becom- 

 ing better defined with age. In the female the whole wing is 

 more or less stiffused with Ijrown, the apical portion only faintly 

 deeper than the rest, except in old specimens where the contrast 

 may be fairly well marked. 



While often found in company with the preceding species, 

 cequahilis prefers the larger streams, and is considerably warier 

 and swifter of flight than its congener. 



Genus Lestes, Leach. 



The members of this genus are easily recognized in life by their 

 habit of resting with the wings half spread. The genus is separated 

 from the remaining genera of Agrionidae by the position of 

 the median sector, which arises nearer the arculus than the 

 nodus (Fig. A). The superior appendages of the male form a pair 

 of curved forceps, toothed along the inner margin, and these 

 together with the inferior pair offer the best characters for the 

 separation of the different species. These are mostty dark 

 bronze-green or brown forms, the males having the last two 

 joints of the abdomen and the space between the wings covered 

 with a bluish w^hite dust. The females of the different species 

 are not readily separated, but can generally be recognized in 

 the field by their associating with males of their own species. 



3. Lestes congener, Hagen. Fig. B. 



Hull, September 14th, 1907, 1 male (Letourneau). 



This is rather smaller than the other species of Lestes 

 belonging to our fauna, and is somewhat local in its occurrence. 

 It was common in Algonquin Park in 1903-04, and I have taken 

 it at Nepigon and in Niagara Glen. 



Its appendages resemble those of L. eurimis, which probably 

 also inhabits Ontario, in that the inferior pair is not more than 



