Kl'HV-WASI' AND MASON-WASP 



The Mason-wasp builds temporary towers to exchuie enemies from Iter nest. In spite of tliis preca\ition. the Riibv- 



vvasp succeeds in iiettin;^ access to some of the cells and introducinfi lier e.i;i;s. Iler jirubs destroy those of the 



mason, sometimes eating! the etin before it hatches, and tlien consiimint; tlie food that was stored for the inason-i^nib's 



consinnption. Ttie Mason-wasp is shown above, and the Rnl)y-wasps below, .Ml considerably enlarged. 



