20. A spraying table showing what poisons are used, when and for what plants and insects. 21. The principal beneficial insects and the ways in which they are beneficial. Special Topics Much of the information called for by the topics below may be obtained from United States and state government bulletins. Most of these may be obtained free from the Department of Agriculture and from various state agricultural colleges, while others may be obtained by purchase at a nominal price. _Orthoptera._ 1. Locust migrations and their cause. 2. The locust plagues of the "great plains." 3. Crickets and their "songs." _Hemiptera._ 4. The fight against the orange scale of California. 5. History of the introduction and spread of the San José scale bug and the efforts to find a natural enemy. How people fight the pest. 6. Aphids. 7. Relations of ants and aphids. 8. Phylloxera and its work. 9. The methods of fighting the chinch bug. 10. Scale bugs. 11. Cochineal bug and the lacs. _Coleoptera._ 12. The carrion beetle and its peculiar habits. 13. Fireflies. 14. Egyptian scarabs. 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 exterminating 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 preventing plagues of flies. 23. The tsetse fly. 24. Sleeping sickness. 25. The house fly and typhoid. 26. Parasitic larvæ 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. SOME COMMON BUTTERFLIES--A Reference Table and Key =============================================================================== GROUP |COMMON NAME |WING |BROODS |FOOD PLANTS OF |HAUNTS OF THE | |EXPANSE | |CATERPILLAR |BUTTERFLY | |IN INCHES| | | |CHARACTERISTIC COLORS, MARKINGS, ETC. ------------------------------------------------------------------------------- Milkweed Butterflies