ILLUSTRATIONS. 



PLATKS. 



I'anc. 



Plate I . Work of the locust borer ( Cyllene robinisc) 2 



II. Work of the western pine-destroyinf^ barkbeetle in hark, ronioved 



from kilh'd tree; also faint marks on surface of wood 18 



111. Work of the western pine-destroying barkbeetle, removed from killed 



tree 18 



TEXT KICURES. 



Fic . 1 . The locust borer ( Cyllene rohiniae) : Larva 2 



2. The locust borer: Egjjs, larvee from hibernation ceils 3 



3. The locust borer: Male and female beetles 4 



4 . The locust ])orer : Pupa 5 



5. The locust borer: Hibernation or larval cells 10 



(). The locust borer: Reproductive organs of female 11 



7. The western pine-destroying barkbeetle (Dendroctoiius brevicomis) : 



Adult male and female, and details 18 



8. The western pine-destroying barkbeetle: Galleries in the inner bark.. 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 pine saywer {Monohammns lilillalor): Male and female. . . 4(i 



1'). The southern ])ine sawyer: Kgg and details 47 



1(). The southern i>ine sawyer: Larva and detiiils 47 



17. The southern pine .sawyer: Pupa 48 



18. The southern pine sawyer: Egg pit and eggs in position 51 



19. The southern i)ine sawyer: Gallery and details M 



20. The southern j)ine sawyer: Cross section of pupal cell 52 



21 . The southern ])ine sawyer: Work of larvae in bark 53 



22. The southern i)ine sawyer: Emergence holes of yonng adulU* 54 



23. Braroii ( Melanobracon) vebbi: Dorsum of second abdominal segment .. . 54 



24. liraron ( Mclanobracon) ivebbi: First four antenual joints 54 



VII 



