LIST OF ILLUSTRATIONS 



FIG. PAGE 



1 . Diagram of an insect . . .• 16 



2. Diagram of internal parts of an insect 16 



3. Diagram of insect's heart 17 



4. Mouth parts of a biting insect 17 



5. Diagram showing tracheal system of an insect 18 



6. Abdomen of locust, showing spiracles 18 



7. Head of bee, showing compound eyes, ocelh, and antennae . ... 19 



8. Metamorphosis of the house fly 19 



9. Diagram of segments of arthropod, showing leg muscles, etc 19 



10. Eggs and larvae, of Culex mosquito 24 



11. Pupa, of Culex and Anopheles mosquitoes 26 



12. Culex pungens, male and female 27 



13. Anopheles quadrimaculatus, male and female 28 



14. Position of Anopheles and Culex at rest 28 



15. Breathing position of larva, of Anopheles and Culex 29 



16. Eggs of Anophelfes • 30 



17. The Southern b|tf alo gnat 32 



18. Larva of Southern buffalo gnat 33 



19. Pupa of Southern buffalo gnat 33 



20. The black horsefly 36 



21. The green-head fly 36 



22. The stable or stinging fly 39 



23. The horn fly 42 



24. Tsetse fly 44 



25. The "sheep tick." 47 



26. The screw worm fly 51 



27. Metamorphosis of the flesh fly 52 



28. Horse botfly, showing eggs, larva, and adult 54 



29. Ox botfly, Hypoderma hneata, 58 



30. Ox botfly, Hypoderma bovis 59 



31. Eggs of Hypoderma lineata 59 



32. Larval stages of Hypoderma hneata 61 



33. The sheep botfly, showing larva, pupa, and adult 63 



34. The dog flea, anterior portion of body 66 



35. The human flea, anterior portion of body 66 



36. The dog flea, showing development and mouth-parts 67 



37. Larva of flea 68 



38. Sucking louse of horse, Hsematopinus asini 73 



