106 SOME INSECTS INJURIOUS TO FORESTS. 



Page. 



Dendroctonus hrevicomis, combating, first recommendations 27-28 



methods 27-30 



damage, extent 19 



death of pine resulting therefrom 18 



distribution 19 



early history 20-21 



first generation 23-24 



habits 25-27, 29 



hibernation 23 



insect enemies 27 



life history 23-25, 29 



losses, extent 19 



prevention, possibilities 19 



natural enemies 27 



observations by A. D. Hopkins, 1899-1904 21-22 



H. E. Burke, 1904 22-23 



J. L. Webb, 1905 23-27 



])ublications, list 30 



remedies, summary 29-30 



second generation 24-25 



summary of habits 29-30 



life history 29-30 



remedies 29-30 



engelmanni causes death of Engelmann spruce 59 



frontalis causes death of pine and spruce 58 



monticolse causes death of sugar pine, silver pine, western yellow 



pine, and lodgepole pine 59 



piceaperda causes death of spruce 58-59 



control, successful, example 75 



ponderosx causes death of western yellow pine 59 



control, successful, examples 76-78 



pseudotsugx causes death of Douglas fir 59 



terebrans, injuries to wood of living pines 62 



valens, injuries to wood of living pines 62 



Dipterous larva in mines of Cyllene robinise 35 



Diseases in control of forest insects 86 



Douglas fir beetle. (See Dendroctonus pseudotsugse.) 



Elaterid enemy of Cyllene robinise 8 



Elm, injuries to wood of living trees by Corthylus columbianus 61 



Entomology, forest. (See Forest entomology.) 



Eupsalis minuta, injuries to wood of living oak trees 60 



Felling infested trees to control barkbeetles 74 



trees at proper month or season to prevent injury from insects that infest 



crude forest products 80 



to prevent injury from insects that infest dying and dead wood. . 79 

 Fir beetle, Douglas. (See Dendroctonus pseudotsugse.) 



Douglas, killed by Dendroctonus pseudotsugse 59 



pulpwood, injuries by insects _. 65 



Fire-killed timber injured by insects 68 



Fire not recommended against Southern pine sawyer 54 



Fires, forest, and forest insects, interrelations 67-69 



as agency in destroying forest insects 68-69 



losses therefrom 67 



publications relating thereto 101 



