62 



NATURE STUDY 



for running. Note the long filaments projecting backward from 

 the posterior tip of the body. Those of the young May-fiies 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 3^011 ng 

 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 

 which you carry 



into the schoolroom 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 mnch better. There is a certain kind of May-fly whose 

 young I have found abundant in watering troughs in September 



Fig 31. .\ Stone 



