. Insect enemies of the spruce in the Northeast : a popular account of results of special investigations, with recommendations for preventing losses . Galleries of Polygraphus rufipennis, showing different Stages. PLATE of Tetropium cinnamopterum. Surface of the wood of a peeled and felled spruce., showing mines made by thespruce Tetr opium—natural size. Jul. 28, New Series, Div. of Entomology, U. S. Dept. of Agriculture. Plate Mines of Tetropium cinnamopterum. PLATE XL Work of Xyloterus bivittatus, and Phloeotribus picea Mopk. MS. a, Work of the wood-mining beetle, Xyloterus byvit
. Insect enemies of the spruce in the Northeast : a popular account of results of special investigations, with recommendations for preventing losses . Galleries of Polygraphus rufipennis, showing different Stages. PLATE of Tetropium cinnamopterum. Surface of the wood of a peeled and felled spruce., showing mines made by thespruce Tetr opium—natural size. Jul. 28, New Series, Div. of Entomology, U. S. Dept. of Agriculture. Plate Mines of Tetropium cinnamopterum. PLATE XL Work of Xyloterus bivittatus, and Phloeotribus picea Mopk. MS. a, Work of the wood-mining beetle, Xyloterus byvittatus, in the sapwood of spruce—natural size. b, Fungus {Polyporus volvatus) growing from mines of Xyloterus bivittatus on the surface of the wood after the bark had been removed—natural size. c, Work of Phloeotribus pieea Hopk. MS. in spruce. 70 Bui. 28, New Series, Div. of Entomology, U. S. Dept. of Agriculture. Plate XI.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1901
