ENEMIES AND TIIKIR INFLUENCE. 



413 



Fio. 349. Section view of curved burrow of Stotliis ostuta, showing double trapdoor entrance. 

 Fi(i. 350. The globular burrow, with trapdoor of Stotbis cenobita. (Section view.) Fio. 361. 

 Front view of trapdoor. (Natural size.) 



