REPORT ON FORESTS. 



219 



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

 do not lay so many eggs as the bark borers, but multiply rapidly 



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



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



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



Figure 8. Giant borers, Prionus species ; larva, pupa and adult natural size From Riley. 



