ILLl STkATlOXS 



I'l.ATKS. 



Page. 



Plate 1 . Work nl" the locust bortT [Cyllcnc ruhixiu ) 2 



II. Work of the western pine-destroyin<^ barkbeetle in bark, removed 



from killed tree; also faint marks on surface of wood 18 



III. Wi irk of the western pine-destroying barkbeetle, removed from killed 



tree 18 



TE.XT FIGURES. 



Fig . 1 . The locu.^t borer ( Cyllcne robiniA) : Larva 2 



2. The locust borer: Eggs, larvae from hibernal ion (ells 3 



3. The locust borer: Male and female beetles 4 



4. The locust borer: Pupa 5 



5. The locust borer: Hibernation or larval cells 10 



6. The locust borer: Reproductive organs of female 11 



7. The western pine-destroying barkbeetle (Dcndroctonus brericomis): 



Adult male and female and details 18 



8. The western pine-destroying barkbeetle: Galleries in the inner liark.. 19 



9. The western pine-destroying barkbeetle: Larva 20 



10. The western pine-destroying barkbeetle: Pupa 22 



11. The western pine-destroying barkbeetle: Pitch tubes on bark of tree. . 25 



12. The western pine-destroying barkbeetle: Hibernating or transforma- 



tion cell, exit burrow, exit holes, pitch tubes 26 



13. The effect of the storm of April 24. 1908 44 



14. The -southern jiine sawyer ( MonohummuH tidllator): Male and female. . 46 



l-i. The southern j)ine .sawyer: Kgg and details 47 



Hi. The sf)uthern ])ine sawyer: Larva and details 47 



17. The southern jiine .sawyer: Pupa 48 



18. The southern pine sawyer: Egg pit and eg<j^ in position 'A 



19. The southern i)ine sawyer: CJallery and details 52 



20. The southern pine sawyer: ( "ro-ss section of pu])al cell 52 



21 . The southern pine sawyer: Work of larvte in bark 53 



22. The southern jniie sawyer: Emergence holes of young adults 54 



23. Bnicon { Mfl(inohmron) vcbbi: Dorsum of second abdominal segment.. 54 



24. Braion ( Melanohraron) nrhbi: First four antennal joints 51 



i:kK.\T.\ 



Page 57, line 10, for priialr and /tiib/ii- read jin'iul,. nhih . and iinlinnnl. 

 Page .59, line 19 from bottom, for lUiidmrtroiniM read IhndrarlunuH. 

 Page ()l. line 13 from iMiltom, for n>hin;t read rfibini:» . 



