CONTENTS. 



Page. 



Character and extent of injury 381 



Knowledge necessary to prevention of losses 382 



Distinctive character of insect injuries 382 



Ambrosia or timber beetles 383 



Round-headed borers 385 



Flat-headed borers 386 



Timber worms 386 



Powder post borers 387 



White ants, or termites 389 



Black ants 390 



Carpenter bees 390 



Nut weevils and their allies 390 



Drug beetles 391 



Conditions favorable for insect injury 391 



Crude products 391 



Unseasoned products in the rough 395 



Seasoned products in the rough -. 396 



Finished or utilized products 396 



ILLUSTRATIONS. 



FIG. 43. Work of ambrosia beetles in tulip or yellow poplar wood 383 



44. Work of ambrosia beetle, Xyleborus celsm, in hickory wood 384 



45. Work of ambrosia beetles in oak 384 



46. Work of round-headed and flat-headed borers in pine 385 



47. Work of timber worms in oak 386 



48. Work of powder post beetle, Sinoxylon basilare, in hickory poles 387 



49. Work of powder post beetle, Sinoxylon basilare, in hickory pole 387 



50. Work of powder post beetle, Lyctus striatus, in hickory handles and 



spokes 388 



51. Work of powder post beetle, Xyletinm paltatm, in old pine flooring. . 388 



52. Work of white ant, or termite, Termes flampes, in sound and dry red- 



oak molding from door casing 389 



53. Work of carpenter bee, Xylocopa orpifex, in redwood lumber from 



San Jose, Cal ..... 390 



54. Work of round-headed borer, Callidium antennatum, in white-pine 



bucket staves from New Hampshire 



55. Work of hemlock tan-bark destroyer, Dinoderus substriatus 397 



66. Work of rounded-headed borer, Phymatodes variabilis, in oak tan bark . 398 



ii 



