PEOTECTIVK DEVICES 



FIG. 37. Larva of caddis-fly in case of sticks con- 

 structed by itself as protection against its enemies. 

 When disturbed, it draws itself up within the house 

 of sticks, mud and pebbles. 



FIG. 36. Elder cane, showing 

 top view of holes drilled by tree- 

 cricket, a protective receptacle 

 for her eggs. At left, part of 

 cane split to show eggs In posi- 

 tion. 



FIG. 38. Larva of Interrogation butterfly (Grapta interrogationis) about to pu- 

 pate, showing protective many-barbed spines. From a photograph. Enlarged. 



4 



