Indian forest insects of economic importance Coleoptera . the centre to the limits of its habitat. Another pointabout the distribution of some of these genera, which is known to bethe case in other parts of the world, is that one or more appear to beconfined to a particular species of tree. There are, , three speciesof Scolytus known in the Western Himalaya (5. nntjor, S. minor, andS. deodar a), and they all infest the deodar. I have never yet taken the genus from any other tree in theHimalaya, nor have I found it at allin the plains. And \ et in Europe thegenus is confined to broad-leaved
Indian forest insects of economic importance Coleoptera . the centre to the limits of its habitat. Another pointabout the distribution of some of these genera, which is known to bethe case in other parts of the world, is that one or more appear to beconfined to a particular species of tree. There are, , three speciesof Scolytus known in the Western Himalaya (5. nntjor, S. minor, andS. deodar a), and they all infest the deodar. I have never yet taken the genus from any other tree in theHimalaya, nor have I found it at allin the plains. And \ et in Europe thegenus is confined to broad-leaved tree- \\e must look to America lor analo-goiis instances of its infesting com!There is a / Wv^n//>//;rs (!. W it is true, \\lneh will also infest the de. idar, 4.—Polygraphi« major, Steb. X 16. but only wlit-n it is unabl* sufficiency of its own real host, the blue pine. The important genus Fomicus, on the other to infest the deodar. One species (T. n/>blue pine (often in company with Ioly^niplins />/;//) and spruce ibut not. INDIAN FOREST INSECTS thr silver fir); whilst a second confines itself to the long-leaved pine (Pinus la] ;.t tli. lower elevation at which this latter tree family oi wood-borers, the Platypodidae, closely allied to the Scoly-tidae, has a similar distribution, one species being confined to the deodar, a„,<! to thr spruce and blue pine, whilst a third restricts its attacks to the 1 o n g -1 e a v e dp i n e, whosewood it fre-quently so rid-dles with shot-holes as torender it use-less as bark-borers of thesilver fir are,on the otherhand, totallydissimilar tothose of theother conifersgrowing eitherwith it, as doesthe spruce, orin its vicinity(deodar andblue pine). Thecurious genusScolytoplatypus(p. 604) infeststhe wood ofthistree; whilst thegen us Xyle-bonis infeststhe branches(p. 582); a spe-cies of Dryo-coetes infeststhe bast andsapwood of thespruce (p. 549). Some of the true scolytid wood-borers and thos
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1914
