ENEMIES AND THEIR INFLUENCE. 



413 



FIG. 350. 



FIG. 349. 



FIG. 351. 



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

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

 Front view of trapdoor. (Natural size.) 



