KELLICOTT. 15 



4. No postocular spots Erythromma. 



Two postocular spots Nehalennia. 



5. The tenth segment of the male a little prolonged above, the 

 process bifid ; pterostigmas on fore and hind wings of male of 



different color 6. 



The tenth segment of male without the superior bifid process 

 (Except in exsulans and fischeri). Pterostigmas on wings of 

 male similar Enallagma. 



6. No postocular spots Amphiagron. 



Two postocular spots 7. 



7. Pterostigma remote from the costa in the male Anomalagrion. 



Pterostigma normal in position in the male Ischnura. 



LESTES, Leach. 



In W. F. Kirby's Catalogue of the odonates of the 

 world, thirteen species of Lestes are ascribed to the 

 Nearctic region ; of these, eight have been taken in the 

 state and there is, at least, one more that is very likely 

 a resident, Viz: L. urina as it has been taken in Illinois 

 and Pennsylvania 



Our species belong to three groups, separated by 

 the relative length of the inferior and superior ab- 

 dominal appendages of the males : 



1. Inferior pair shorter than half the length of the superiors, 



congener, (eurina). 



2. The same more than half, but no longer than the superiors : 



( 1 ) Inferior appendages of the male sigmoid unguiculata, 



(2) Same straight, abruptly widened apically uncata. 



( 3 ) Same not widened apically disjuncta. 



(4) Same gradually and slightly widened, a little larger than dis- 

 juncta, two teeth on the inside of the superiors, basal one 



larger, (equal in disjuncta) forcipata. 



(5) Same long, bent downward apically, abomen of the male very 

 long rectangularis. 



(6) Same long, very slender not dilated apically vigilax. 



3. The same longer than the superiors apex turned inward, 



inaequalis. 



Lestes congener, Hagen. 



Length: of hind wing, c? 18-22 mm., 9 22 mm. ; of 

 abdomen d" 27-31 mm., 9 28 mm. 



The general color of both sexes is blackish bronze. 

 The labrum, anteclypeus, genas, under side of the head, 



