AQUATIC INSECTS 

 blant stem 



Fig. 2 1 8. — Larva of Donacia palmata with its head 

 thrust into air space in a Hly stem, breathing air 

 though three feet under water (after MacGilHvray) . 



its body, buoying it up, and at the same time furnishing it with 

 a breathing supply sufficient for it until it reaches the surface 

 of the water. 



as 



Fig. 219. — Galerucella nymphcBa: i, larva; 2, adult;' 

 3» eggs. 



Galerucella nymphaea. — This genus also lives mostly upon 

 water-lilies but its whole life is spent above the surface of the 

 water. The adults (Fig, 219) have indistinctly striped wing- 

 covers; the females lay small clusters of shining yellow eggs 

 on the upper surfaces of yellow pond-lily pads. The larvae 

 (Fig. 219J, a little more than a quarter of an inch long, are 

 black with fine whitish lines and spots. They feed on the 

 leaf tissues until they are fullgrown and then pupate, often 

 upon the same leaf. 



281 



