160 The Ohio Journal of Science [Vol. XXI, No. 5, 



as numerous as A. alternata. Most of them were from the 

 spring, station 13. 



Corixa verticalis Fieber. This was also a common species, 

 possibly somewhat more so than the preceding. Very few were 

 from the spring, most from the small pond, but also a few from 

 the large pond. 



Family Notonectidce. 



Notonecta variabilis Fieber. This was the only backswimmer 

 found and only a single specimen was secured in the shallow, 

 vegetationless pool, station 17. It was surprising to find it so 

 rare and other members of the family entirely missing. Since 

 they could not escape detection easil}", it is probable that no 

 other kinds were present at the time. 



But Drake found a total of six species in a number of years 

 collecting. Of the five, which I did not find, he wrote me that 

 Notonecta undidata Say, was most common when he collected. 

 N. irrorota Uhl., and N. insidata Kirby, both not uncommon, 

 and Plea stn'ola Fieber, and Bueno margaritacea Bueno rare. 



Family Nepidce. 



Ranatra americana Montd. This was the only species of 

 the family present. Just three specimens were found, in the 

 slight vegetation and debris off shore at stations 14 and 15. 

 Thorough combing around the large pond failed to disclose 

 any elsewhere than at these favorable localities. 



Famil}' Belostomatidcc. 



None of the largest members of this family were seen, but 

 Drake reported that he found a few Benaciis griseus Say. 



Belostoma (Zaitha) fluminea Say, was the only represen- 

 tative of the family found. Only four specimens were found, 

 so that this form, so generally common, was scarce here. 



Family Saldidce. 



Micranthia humilis (Say). This was the only representative 

 of the shore bugs found. It was rare, as only one specimen 

 was found. 



Drake reported the species fairly common when he collected, 

 and also reported collecting a few Saldula major (Prov.) and 

 Saldida orhiculata (Uhl). 



