79 



Belostoma americana Leidy. Columbus. Abundant 



and widely distributed. 

 Benacus griseus Say. Columbus. Abundant and 



■widely distributed. 



NEPIDAE. 



Nepa apiculta Uhl. Columbus. 

 Ranatra fusca Pal Beauv. Columbus. 

 Ranatra 4—dentata Stal. Columbus. Our most 

 common form, ranges south and west. 



NOTONECTIDAE. 



Notonecta undulata Say. Wauseon. Abundant over 

 large part of U. S. Columbus. Common. 



Notonecta irrorata Uhl, Columbus. 



Plea striola Fieb. Columbus. Abundant and widely 

 distributed in U. S. 



CORISIDAE. 



Corisa alternata Say. Columbus. Very abundant aud 

 of wide range. 



Corisa harrisii Uhl. "Ohio." Common. Widely dis- 

 tributed. 



