STREAMCRAFT 



Certain of these larval forms of aquatic insects 

 or their natural (shed skins) or artificial cases 

 are often seen attached to the stones along the 

 stream. 



The chief part of an insect's life is spent in 

 the intermediate or sub-imago state, the brief 



Stone-fly (male, aquatic larva, and female) 



existence in the perfect state serving mainly for 

 propagation. Many pass out of existence be- 

 fore their eggs are hatched. The sexes are dis- 

 tinct in all, and marked differences may be 

 exhibited in males and females of the same 

 species, in size, color, and form. All are very 

 fond of heat and display their greatest activity 

 only in warm weather. The metamorphoses or 

 transformations of insects are wonder- and ad- 

 miration-inspiring phenomena. "A worm in- 

 88 



