172 WESTERN QUARTERLY REPORTER. 



Length of body half an inch nearly. 



Male. Body brown ; abdomen beneath whitish ; eyes large, 

 prominent, approximate, separated above only by a fissure ; thighs 

 banded with reddish-brown near the middle, and at tip ; wings 

 snowy white : nervures brown, and margined with brown, more 

 particularly so at the base, middle and tip of their costal mar- 

 gins; caudal setae hardly twice the length of the body. 



Female. Body brown ; scutel yellowish, distinct ; venter 

 whitish; eyes distant; front prominently carinated : wings 

 whitish ; nervures brown, equally margined with brown ; inferior 

 wings less than half as long as the superior ; feet pale brown, a 

 reddish-brown band and tip to the thighs ; caudal setae hardly as 

 long as those of the male. 



Caught at Cincinnati, Ohio, and did not appear in any con- 

 siderable numbers. 



Genus CLOEON Leach. 



C. posticata. — Abdomen pale green, behind brown ; thorax 

 black opake ; wings white. 



Inhabits Shippingport. 



Eyes apparently four, approximate ; superior ones elevated, 

 subpedunculated; cornea subdiscoidal, slightly convex, edge 

 tinged with yellow ; inferior ones smaller, not elevated, longitudi- 

 nally oval, dark reddish-brown ; thorax deep black opake : wings 

 pure white, immaculate, inferior ones very small ; feet pure white, 

 anterior pair slightly dusky at base ; scutel elevated ; abdomen 

 pale bluish-green, hyaline, three terminal joints deep brown opake 

 above; seta two, long, pure white. 



Length of the body three-tenths of an inch ; of the setae 

 seven-tenths of an inch. [163] 



A small and delicate species. Considerable numbers of them 

 appeared on our boat, May 21st, while at Shippingport. The 

 contrast between the black and greenish colors of this insect is 

 very striking ; and the greenish portion of the abdomen is so 

 diaphanous as to exhibit the movements of the interior of the 

 body. 



Genus EPHEMERA Latr., Leach. 



E. cupida. — Body black ; wings dusky, inferiores pale, dusky 

 at tip ; thorax with three distinct longitudinal lines. 

 Inhabits Ohio river. 



