WATER SPIDER. 



Ill 



tually pass, in many respects (notably in their having 

 scales on their wings) resemble butterflies and moths. 

 The larvae of another insect, belonging to the 

 Ephemera, is usually very abundant in ponds. It is 

 shown in its natural size at b, Fig. 67, as well as 



Fig. 67. 



Fig. 68. 



Water Spider (Argyoncta 

 aquatica). 



Larvae of Ephemera'. 



enlarged, to indicate the breathing leaflets along the 

 sides of the body. 



Nor should we forget the exceedingly interesting 

 water spider, .not only because its habits depart so 

 extremely from those of its kind, but also on account 

 of its prettiness and intelligence. This species (Ar- 

 gyoneta aquatica) is not uncommon. In the water it 

 looks as if its body were covered with a film of 

 quicksilver. This is in reality a film of air which it 



