r ( 





X 



r --> 



3. 131. Development of a dragon-fly (Leucorhinia glacialis Hagen) 



/, two nymphs on the bottom of the pond ; 2, the empty nymphal skin left clinging to a 

 branch after transformation ; j, the adult female ; 4,5, back and side views of the adult male 



(After Xeedham) 



FIG. 



101 



