92 THE STUDY OF INSECTS. 



plate-like gills on the end of the abdomen (Fig. 99). Figure 

 100 represents one of these gills enlarged. When the nymph 

 get its growth it crawls out of the water and rests on some 

 grass-blade or reed ; then the skin splits down the back and 

 the Dragon-fly comes forth, while the old skin, perfect in 

 form, still clings to its resting-place like a ghost until some 

 inquiring wind blows it away (Fig. 101). 



