STUDIES OF INSECTS 43 



15. The curculio and methods of fighting it. 



16. The weevils and their work. 



17. History of the Colorado potato beetle. 



18. Lady-bird beetles, their habits and use in extermi- 

 nating harmful pests. 



Diptera. 19. The investigations in Cuba of the cause 

 of yellow fever. 



20. The fight against yellow fever in New Orleans. 



21. Methods of preventing plagues of mosquitoes. 



22. How flies are carriers of disease. Methods of pre- 

 venting plagues of flies. 



23. The tsetse fly. 



24. Sleeping sickness. 



25. The house fly and typhoid. 



26. Parasitic larvae of flies. 



Lepidoptera. 27. The silkworm and the silk industry. 



28. Story of the gypsy moth. 



29. Life history of the clothes moth. 



30. Harmful butterflies. 



31. The tussock moth and its history. 



32. Blastophaga and fig culture. 



33. The codling moth and its work. 



34. Cutworms. 



35. The brown-tail moth. 



Hymenoptera. 36. The honeybee and honey making. 



37. Gall and gall insects. 



38. The habits of the digger wasp. 



39. The homes of ants. Habits of ants. 



40. Slavery among ants. 



41. Agricultural ants. 



42. Homes of bees. 



43. Ichneumon flies and their beneficial habit. 



44. Evidences of intelligence among ants. 



