PLATE XL 



W(»'A- (\f Xiiloterus hiinttdtns, and Phld'otribii.s picea iopk. MS. 



a, Work of the wood-mining beetle, Xyloternn hivittdtns. in the sapwood of 



spruce — natural size. 



b, Fungus {PoJyporufi volvatus) growing from mine!* of Xyloterux hivittatvs on 



the surface of the wood after the bark had been removed — natural size. 



c, Work of Phlceotribus 23icea Hopk. MS. in spruce. 



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