164 CONTENTS 



17. The maple terrapin scale 299 



18. The tulip tree lecanium 301 



19. The magnolia scale 302 



20. The European elm scale 303 



21. The burr oak kermes 305 



22. The pit-making oak scale 306 



23. The common red spider or spider mite 308 



24. Plant lice 310 



25. The pine bark aphid 310 



26. The cockscomb elm gall 311 



27. The catalpa midge 312 



28. The sycamore lace bug .- 314 



XII. Boring insects 316 



1. The locust borer 316 



2. The locust twig-borer 317 



3. The poplar borer 318 



4. The poplar and willow borer 319 



5. The hickory bark beetle 320 



6. The pigeon tremex 321 



7. The maple borer 322 



8. The white pine weevil 323 



9. The bronze birch borer 326 



10. The maple and oak twig pruner 327 



11. The carpenter worm 329 



XIII. Illustrations 332 



XIV. Literature referred to 473 



XV. Index 475 



