62 



NATURE STUDY 



for running. Note the long filaments projecting backward from 

 the posterior tip of the body. Those of the young May-flies are 

 usually three in number and fringed with hairs. They aid in the 

 locomotion of the insect. Those of the stone-fly are usually two 

 in number, and their use is not known. Some kinds of young 

 May-flies live in ponds. 



I have been careful to speak of these insects always as young 

 stone- flies and young May-flies. For they are stone-flies and 

 May-flies in their immature, or so-called nymphal condition. The 



adult stone-flies 

 (fig. 34) and 

 May-flies (fig. 

 35) are winged 

 insects which 

 live in the air, 

 and have a very 

 different appear- 

 ance and very 

 different habits 

 from the young. 

 It is possible 

 that you may 

 be fortunate 

 enough to obtain 

 some of the 

 winged adults 

 from the young 



34. A stone fly. which you carry 



into the school room aquaria. If you can find some young May- 

 flies in a pond, so that you can keep them alive in the permanent 

 quiet water aquarium, your chances for seeing the issuance are 

 very ranch better. There is a certain kind of May-fly whose 

 young I have found abundant in watering troughs in September 



