Calamistrum, 73. California trap-door spider, 49. Care of young, 104. Cave spiders, 113. Ciniflonidæ, 72. Classification of spiders, 11, 23. Claws, 14. Cobwebs, 54. Cocoons, 98. Colors of spiders, 17, 19. Concealment of spiders, 70. Copulation, 94. Crab spiders, 29. Cribellum, 72. Curled webs, 72. Darwin on flying spiders, 83. Dictyna, spinning of, 73; regular webs of, 74. Distribution of spiders, 113. Doleschall, experiments on poison of spiders, 34. Dolomedes, nest for young, 53. Dorsal groove, 17. Drassidiæ, 26. Eggs, laying, 98; growth of, 105. Embryo spiders, 105. Epeiridæ, 31. Epigynum, 92. Erigone, heads of male, 88. Eyes, 17. Feet, 14. Flying of spiders, 79. Food of trap-door spiders, 50. Growth of spiders, 86. Habitats of spiders, 113. Hatching, 107. Heads of male spiders, 88. Heart, 21. Hoisting captured insects, 60. Holes, 44. House spiders, 114. Intestine, 21. Jumping spiders, 28. Laying eggs, 98. Legs, 14. Linyphia communis, web of, 58. Linyphia marmorata, web of, 58. Lycosa, flying of, 81. Lycosidæ, 27. Mandibles, 33. Maxillæ, 15. Moggridge, on poison of spiders, 36; on trap-door spiders, 46. Moulting, 110. Mouth, 59. Mygalidæ, 23. Nephila, web of, 66. Nervous system, 22. Nests, 52. Noise by a spider, 16. Œsophagus, 19. Palpi, 14. Palpal organs, 89. Parasitic spider, 58. Parasites of spiders, 104. Pholcus, habit of, when frightened, 61. Poison of spiders, 34. Poison-glands, 23. Regular web of Dictyna, 74. Repair of webs, 67. Reproduction, 94. Reproductive organs, 22. Round webs, 61. Running spiders, 27. Saunders, S. S., on digging of trap-door spiders, 50. Sexes of spiders, 86. Shooting of threads, 79. Six-eyed spiders, 25. Shaking web when frightened, 70. Spines, 14. Spinnerets, 39, 41. Spinning-glands, 40. Spinning-tubes, 40. Spots on top of abdomen, 17. Stomach, 21. Sucking-stomach, 19. Tame spiders, 37. Tarantula, 36. Theridion, web of, 60. Theridiidæ, 30. Thomisidæ, 29. Thorax, 12. Thread, 38, 42. Tracheæ, 17. Trap-door nests, 44. Triangle spider, 75. Tubes, 52. Tying up insects, 43. Use of spider’s web, 70. Water spider, 53. Wilder, on moulting of spiders, 110; Triangle spider, 75; use of spider’s silk, 70. Winter habits of spiders, 113. Young spiders, 107; escape from cocoon, 103. Zilla, web of, 65. _Electrotyped by C. J. Peters & Son, Boston, Mass._ Transcriber’s Notes: