. Insect enemies of the spruce in the Northeast : a popular account of results of special investigations, with recommendations for preventing losses . 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.
. Insect enemies of the spruce in the Northeast : a popular account of results of special investigations, with recommendations for preventing losses . 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 Work of Xyloterus bivittatus and Phlceotribuspicea hopk. m. s. PLATE XII. Work of Dendroctonus frontalis and Dendroctonus terebrans. (From drawings illustrating Bulletin 56, W. Va. Agr. Exp. Station.) a, Dendroctonus frontalis: A, adult; B, pupa; C, larva; D, adult of Dendrocto- nus terebrans; E, larva. b, Dendroctonus frontalis: A, tibia; B, tarsus; C, D, E, antennse; F. G. mouth parts. Dendroctonus terebrans: H. tibia; J. tarsus; J, K, L, M, N, antenna—all enlarged. c, Pitch tube made by Dendroctonus frontalis—natural size. d, Healing wounds, froni living pine tree, made by D. frontalis—reduced. e, Pupa cases of D. frontalis in outer pine bark. /, Dendroctonus frontalis: A. B, longitudinal section of primary galleries; C,egg in egg cavity inside of gallery—the latter enlarged: others reduced. g, Healing wounds in living tree: E. Dendroctonus frontalis; F, Dendroctonusterebrans. h, Work of Dendroctonus frontalis in pine bark is shown at A, C, D. E, F. G;work of D. terebrans i
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1901
