ENEMIES AND THEIR INFLUENCE. 



413 



Pig. 349. 



Fig. 351. 



Fig. 349. Section view of curved burrow of Stothis astuta, showing double trapdoor entrance. 

 Fk;. 350. The globular burrow, with trapdoor of Stothis cenobita. (Section view.) Fig. 351. 

 Front view of trapdoor. (Natural size.) 



