Indian forest insects of economic importance Coleoptera . ers. The grubs feed at first in the bast and sapwood, eating out windinggalleries which become broader as they proceed. These galleries are tightlypacked with excreta and wood particles. Each gallery is distinct, butwhen the grubs are as numerous as in this case the galleries are liable tointerlace at times. When more than half-grown the larva bores down intothe wood (at A, fig. 200), the tunnel down into the wood being straight at firstand then gradually curving until it again becomes parallel to the long axisof the tree. A broad irreg
Indian forest insects of economic importance Coleoptera . ers. The grubs feed at first in the bast and sapwood, eating out windinggalleries which become broader as they proceed. These galleries are tightlypacked with excreta and wood particles. Each gallery is distinct, butwhen the grubs are as numerous as in this case the galleries are liable tointerlace at times. When more than half-grown the larva bores down intothe wood (at A, fig. 200), the tunnel down into the wood being straight at firstand then gradually curving until it again becomes parallel to the long axisof the tree. A broad irregular gallery is then eaten out in the wood (asshown in fig. B), which is closely packed with excreta and full-grown and ready to pupate the grub curves the gallery oncemore, eating out a narrow chamber parallel to the long axis of the tree, butdeeper in the wood (c). This chamber is at times situated below theportion B of the gallery. In this chamber, which is quite free from woodparticles and excreta, the larva changes to the pupa Fu;. 200.—Larval gallery and pupating-chamber of Xystrocera globosa, Oliv., in pyinkadu. Salween River, Tenasserim. (E. P. S.) As I have said, the insect was taken in all the stages of larva, pupa, andbeetle, though no beetles had yet left the tree so far as I was able toobserve. It is probable that the beetles appear on the wing in April, and it isperhaps possible that the insect passes through two generations in the year. Although in the tree in which it was found the insect was extremely nu-merous, I was unable to find any predaceous or parasitic insects infesting it. The larvae, when numerous, completely destroy the bast layer of thetree, and the insect must therefore be classed as a pest of some importanceso far as the pyinkadu is concerned. FAMILY CERAMBYCIDAE 291 I have also taken this beetle on the wing in Mussoorie, but in spite ofits wide distribution, as shown by Gahan, nothing appears to be knownabout its habits i
Size: 2272px × 1100px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1914
