THE CANADIAN ENTOMOLOGIST 191 



C. Lateral spiries on segments 4-9; mentum of 

 labium 5.5-5.75 mm. long, barely reaching base 

 of hind coxae*; mental setae 7 or 8, hind femora 

 6 mm.; outer wing-pad 6.5 mm eurinus. 



CC. Lateral spines on segments 5-9 (4-9 in one speci- 

 men of disjunctus) , mental setae usually 5-6, but 

 often 7; hind femora less than 6 mm. long; outer 

 wing-pad 5.5 mm. long or less. 

 D. Mentum of labium more than 4 mm. long, 

 reaching generally to apex of hind coxae 

 or beyond; ovipositor extending beyond 

 apical margin of segment 10. 

 E. Mentum of labium 4.3-5.1 mm. long, 

 reaching apex of hind coxae or 

 slightly beyond; ovipositor 3-3.5 

 mm., extending beyond basal joint 



gills uncatus. 



EE. Mentum of labium 4.75-5.5 mm., 

 reaching beyond apex of hind coxae, 

 often to apex of trochanters, ovi- 

 positor 2 mm. long, extending very 

 little beyond apical margin of seg- 

 ment 10 disjunctus. 



DD. Mentum of labium 3.7-4 mm. long, reach- 

 ing generally to about the middle of the 

 hind coxae; ovipositor just reaching api- 

 cal margin of segment 10.. .rectangidaris. 

 AA. Lateral spines present on abdominal segments 2- or 3-9; 

 labium reaching barely to bases of hind coxae or not so 

 far vigilax. 



Lestes congener Hagen. 



Both sexes of this species were reared at the Dominion Biolo- 

 gical Station at Departure Bay, near Nanaimo, Vancouver Island. 

 The nymphs were obtained from Lonely Lake, a large pond a few 

 miles from the Station in the depths of a rocky, coniferous forest. 

 Two species of Lestes occurred near here, L. disjunctus and L. con- 

 This character is doubtless somewhat variable as in other species. 



