REPORT ON FORESTS. 



219 



beetle itself arc driven, and in these the larvae develop. They 

 do not lay so nian\- eggs as the bark borers, bnt multipl}' rapidly 



Figure 7. — Round-headed apple borer : «, puncture in which egg is laid ; b, same in section ; e, hole 



from which beetle has emerged ; /, same in section ; g\ pupa in place. 



From Div. Ent., U. S. Dept. Agl. 



Figure 8. — Giant borers, /'r/^wwi species; larva, pupa and adult natural size From Riley. 



