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 grows. 

 A 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 d 

 p i n e, whose 

 wood it fre- 

 quently so rid- 

 dles with shot- 

 holes as to 

 render it use- 

 less as timber. 

 The bark- 

 borers of the 

 silver fir are, 

 on the other 

 hand, totally 

 dissimilar to 

 those of the 

 other conifers 

 growing either 

 with it, as does 

 the spruce, or 

 in its vicinity 

 (deodar and 

 blue pine). The 

 curious genus 

 Scolytoplatypus 

 (p. 604) infests 

 the wood ofthis 

 tree; whilst the 

 gen us Xyle- 

 bonis infests 

 the branches 

 (p. 582); a spe- 

 cies of Dryo- 

 coetes infests 

 the bast and 

 sapwood of the 

 spruce (p. 549). 



Some of the true scolytid wood-borers and those of the Cossonidae 

 have not this restricted distribution so far as their host-trees are concerned, 

 for species of Hylnstcs and Khyncliolus infest equally the spruce, deodar, 

 and blue pine. A genus of weevils, the well-known Cryptorhynchus, infests 



'in. v -K.^ and l;irv;il galleries of Tomicus longifolia, Steb., 

 in inner hark of J'IHHX longifolia. North-West Himalaya. 



