479 



Males 



a. Dorsum of the thorax and usually the abdomen metallic green. 



b. Inferiors more than half the length of the superiors, but never 

 longer than the superiors, 

 c. Inferiors long and slender ; stigma usually surmounting three 



cells vigilax. 



cc. Inferiors broad and flat; stigma usually surmounting less than 



three cells uncatus. 



bb. Inferiors either longer than superiors or less than half their length, 

 c. Inferiors less than half the length of the superiors ; wings flaves- 



cent eurinus. 



cc. Inferiors longer than superiors; wings not flavescent. .inaequalis. 

 aa. Dorsum of the thorax and abdomen black or dark brown. 



b. Inferiors shorter than half the length of the superiors ; metepimera 



with black spots near the latero-ventral carina congener. 



bb. Inferiors more than half the length of the superiors ; metepimera 

 without black spots near the latero-ventral carina, 

 c. Inferiors sigmoid, the apical two-thirds curved in an opposite 



direction to the superiors unguiculatus. 



cc. Inferiors not sigmoid, the apical two-thirds not curved in an 

 opposite direction to the superiors. 



d. Metapleural suture covered with a sooty black stripe 



disjunctiis. 



dd. Metapleural suture not covered with a sooty black stripe. 



e. Basal tooth of the mesal margin of the superior appendages 



longer than the tooth of the distal third forcipatus. 



ee. Basal tooth of the mesal margin of the superior appendages 

 shorter than the tooth of the distal third rectangularis. 



Lestes congener Hagen 



Nymph. — Color, pale brown or greenish. 



Head twice as broad as long, the caudo-lateral angles not project- 

 ing strongly and provided with few setae ; antennae long and slender ; 

 labium with the median lobe comparatively broad at the base, one- 

 third as broad as the expanded portion and about as long as the latter; 

 mental setae six and sometimes a small seventh on each side, lateral 

 setae four or five, three or four of which are located on the distal seg- 

 ment ; inner, mesal lobe of the proximal segment of the palpus as 

 broad as the fork-like process between it and the distal segment of the 

 palpus ; labium, when folded, extending caudad between the metacoxae. 



