504 



The Ohio Naturalist. 



[Vol. XV, No. 7, 



As the n^^mph emerges, the chorion is split longitudinally, the 

 rupture extending a little over one-half of its length to well over 

 the larger end. About fifty days after hatching the adult stage 

 is reached, five ecdyses having taken place. So far as our obser- 

 vations have gone, it seems to be distinctly a lacustrine species, 

 and found almost entirely in the apterous fonn. They are very 

 active little creatures and congregate in immense numbers near 

 the shore in sheltered places. They are predaceous. Their food 



Fig. 1. 9 Limnogonus hesione Kirk. 

 (From drawing by J. D. Smith.) 



consists of small insects that fall into the water. In case there 

 there are no living victims, they do not disdain food that has been 

 dead for some time, and are often seen feeding on decaying in- 

 sects. (Id. by Mr. J. R. de la Torre Bueno.) 



Metrobates hesperius Uhler. 



Immense numbers, taken at Berea, at Olmsted Falls, and at 

 Columbus by the junior writer. 



Mesovelia mulsanti F, B. White. 



One nymph, taken at Sandusky by the senior writer. 



