112 FLOATING FLIES 



creatures, that limit their flying to short, un- 

 certain excursions along the stream or pond 

 shore, and spend long hours of resting in the 

 close foliage of the bank. . . They probably 

 do not live long." 



Of the stone flies Prof. Kellogg writes as 

 follows : 



" On the under side of the same stones 

 in the brook * riffles ' where the May fly 

 nymphs may be found, one can almost cer- 

 tainly find the very similar nymphs of the stone 

 flies, an order of insects called Plecoptera. 

 More flattened and usually darker, or tiger- 

 striped with black and white, the stone fly 

 nymphs live side by side with the young May 

 flies. But they are only to be certainly dis- 

 tinguished from them by careful examina- 

 tion. . . The feet of the stone flies have two 

 claws, while those of the young May flies have 

 but one. The stone fly nymph has a pair of 

 large compound eyes, as well as three small 

 simple eyes, strong jaws for biting and chew- 

 ing (perhaps for chewing her nearest neigh- 

 bors, the soft-bodied smaller May fly nymphs), 

 and two slender backward-projecting processes 

 on the tip of the abdomen. The legs are 

 usually fringed with hairs, which makes them 

 good swimming as well as running organs. 



