Adult characters of spiders, xi. Agalena nævia, 93. Agalenidæ, 91. Age of spiders, xv. Agrœca pratensis, 11. Air-sacs, x. Air-tubes, x. Amaurobius americana, 215. ferox, 215. sylvestris, 213. Anatomy of spiders, viii-xi. Anyphæna calcarata, 13. incerta, 12. rubra, 13. saltabunda, 14. Argiope, 194. cocoons of, 197, 200. riparia, 194. transversa, 198. webs of, 192, 194, 196, 199. Argyrodes, 123. fictilium, 126. nephilæ, 125. trigonum, 124. Argyroepeira hortorum, 191. Ariadne bicolor, 123. Asagena americana, 122. Attidæ, 41. Attus palustris, 42. Bathyphantes, see under Linyphia, 143, 145. Bites of spiders, viii. Breathing holes, x. Cælotes, see under Tegenaria, 99. Calamistrum, 205. Catalogue of American spiders, viii. Cephalothorax, viii. Ceratinalla fissiceps, 152. lætabilis, 151. Ceratinopsis interpres, 153. Chiracanthium viride, 21. Ciniflonidæ, 205. Claws, x. Clubiona, 15. canadensis, 17. crassipalpis, 16. excepta, 19. ornata, 18. rubra, 18. tibialis, 16. Cobwebs, xvi. Cocoons, xiv. Colors, xi. Coriarachne depressa, 34. versicolor, 34. Cornicularia directa, 152. Coxa, the first joint of the leg, viii. Crab spiders, see Thomisidæ, 24. Cribellata, 205. Cribellum, 205. Cyclosa conica, 183. Cyrba tæniola, 63. Daddy longlegs, see Pholcus, 128. Dendryphantes, 53, 54. æstivalis, 54. militaris, 53. Dew on cobwebs, 107, 108. Dictyna, 206-211. cruciata, 210. frondea, 210. volucripes, 211. volupis, 209. Diplostyla, see under Linyphia, 147. concolor = Linyphia concolor, 147. nigrina = Linyphia nigrina, 147. Dolomedes sexpunctatus, 85. tenebrosus, 87. Dorsal groove, viii. Drapetisca socialis = Linyphia socialis, 145. Drassidæ, 1. Drassus saccatus, 6. Dysdera interrita, 22. Dysderidæ, a family of spiders with six eyes, 22. Ebo latithorax, 37. Eggs of spiders, xiv. Epeira, 160-180. angulata, 164. caudata or conica, see Cyclosa, 183. cinerea, 165. corticaria, 165. directa, see Larinia directa, 182. displicata, 172. domiciliorum, see trivittata, 167. gibberosa, 175, 176. globosa, 173. insularis, 169. labyrinthea, 174. marmorea, see insularis, 169. nordmanni, 163. parvula, 179. patagiata, 160, 161. placida, 176. pratensis, 167. sclopetaria, 160, 161. scutulata, 178. silvatica, 164. stellata, 179. strix, 160, 161. thaddeus, 170. triaranea, see globosa, 173, 174. trifolium, 171, 172. trivittata, 166. verrucosa, 181. Epeiridæ, 154. Epiblemum scenicum, 60. Epigynum, xi. Erigone, 148. autumnalis, 151. dentigera, 149. longipalpis, 149. Ero thoracica, 132. Euryopis funebris, 127. Eyes of spiders, ix. Feet, x. Femur, viii. Filistata hibernalis, 220. Flat webs, 134; see Agalenidæ, 91; Linyphia, 100. Flower spiders, see Misumena, 25.