CONTENTS. 



Page, 



Introd notion 57 



Insect tleiirejations in North Americiin forests 57 



Charat'tf r and extent of depredations 57 



Insei'ts cause the death of trees 58 



The southern pine beetle ". 58 



The eastern spruce beetle 58 



The Engelniann spnice beetle 59 



The Black H ills beetle 59 



The mountain pine beetle and the western pine V)eetle ... 59 



The Douglas fir beetle 59 



The hick(jry barkbeetle 60 



The larch worm 60 



Insect injuries to the wood of living trees 60 



The oak timber worm 60 



The chestnut timber worm 60 



Carpenter worms 61 



Ambrosia beetles 61 



The locust borer 61 



Turpentine beetles and turpentine borers 61 



The white pine weevil 62 



Insect injuries to the wood of dying and dead trees 62 



Coniferous trees 63 



Sawyers 63 



Ambrosia beetles 63 



Pinhole borers in cypress 63 



I lard wood trees 64 



Round-headed borers, timber worms, and ambrosia beetles.. 64 



Insect injuries to f(jrest products 64 



Crude products 64 



liountl-headed borers, timber worms, and ambrosia lieetles.. 64 



Manufactured unseasoned jiroducts 65 



Ambrosia l>eetles and other Avoo<l borers.. . 65 



Seasoned products in yards and storehouses 66 



Powder-post beetles 66 



Finished products 66 



Ctilized pr< )ducts 66 



Pow<ler-jx)st beetles, white ants, and other wood-lxjring in- 



sect« ^ 



Insects in their relation to the reduction of future supplies of timber 67 



I nterrehiti(jns of forest insects and forest fires 67 



Losses from forest insects 67 



Insect-killed timber as fuel for fires. 68 



Fire-killetl timber injuriHi by insects 68 



V 



