KELLICOTT. 29 



Pterostigma of both sexes yellowish brown. 

 Posterior border of the prothorax in d entire, in ? 

 with five small lobes. 



The superior abdominal appendages of the male 

 are as long as 10; somewhat thicker at base then ex- 

 cavated within, curved inward at apex, which ends in 

 a sharp point ; in profile it is slightly narrow at base, 

 and apically decurved. The inferiors are shorter in 

 profile, wedge shape, from above broadened within at 

 the end, making the outline securiform. The append- 

 ages of the female are slender, pale; the valves are 

 short and narrow, also pale. 



NEHALENIA, Hagen. 



This genus consists of few and elegant species, 

 perhaps none of the family are more beautiful. Three 

 are known within the limits of the United States ; two 

 of these occur abundantU^ in Ohio. 



The two species differ as follows : 



Metallic green and blue irene. 



Bronze, black and yellow posita. 



Nehalennia irene, Hagen. 



Length : of abdomen S" 20, ? 21 ; of hind wing c? 

 13, ? 15. 



Metallic green marked with yellow or yellowish 

 white as follo^vs ; post clypeus, gense, borders of the 

 labrum, labium, underside of head, sides of thorax 

 posteriorly, under sides of abdomen, and narrow inter- 

 rupted basal rings on 3-6. An apical spot on 8 the 

 dorsum of 9 and 10 blue. The legs are whitish ^vith 

 black lines ; tarsi ringed. Pterostigma pale yellow. 



The female differs from the above in having the yel- 

 low a little deeper, and that on the sides of thorax, and 



