CONTENTS. 



Page. 



Forest insect depredations 341 



Roundheaded borers 341 



Economic importance 342 



Character of work 342 



Life history and habits 342 



Seasonal history 344 



The western larch bark-borer 344 



The southern pine sawyer 346 



The locust borer 347 



The painted hickory borer 349 



The black-horned pine-borer 350 



The cedar-tree borer 351 



The western cedar bark-borer 352 



The banded ash borer 353 



The red-headed clytus 354 



The oak pruner 355 



The hickory twig-girdler 356 



Summary . 357 



Main Lib, 



ILLUSTRATIONS. 



PLATE. 



Page. 



PLATE XXIII. Work of the black-horned pine-borer (Callidium antennatum] . 348 



TEXT FIGURES. 



FIG. 19. Work of the western larch bark-borer (Tetropium velutinum) 343 



20. Work of the western larch bark-borer ( Tetropium velutinum) 345 



21. Work of the southern pine sawyer (Monohammus titillator) 346 



22. Work of the locust borer ( Cyllene robinise) 347 



23. Work of the painted hickory borer ( Cyllene caryse) 349 



24. Work of the cedar- tree borer ( Hylotrupes ligneus) 351 



25. Work of the western cedar bark-borer (Hylotrupes amethystinus) 352 



26. Work of the banded ash borer ( Neodytus caprxa) 353 



27. Work of the red-headed clytus (Neodytus erythrocephalus) 354 



28. Work of the oak pruner ( Elaphidion villosum) 355 



29. Work of the hickory twig-girdler ( Oncideres cingulata} 356 



ii 



