224 



Ocypete, 159. 



Odynerus, 207. 



fficauthue, 216. 



Oil beetle, 188. 



Ouion fly, 19. 



Ophioueurus, embryology of, 165. 



Orchesella, 143. 



Ornithomyia, 84. 



Orthoptei'ous larvae, 175. 



Osmia, 27. 



Otiorhynchus, 199. 



Ovipositor of Cicada, 185. 



Palpus, vi. Origin of, 174. 



Paugus, 191. 



Panorpa, 171. 209. 



Paper wasp, 207. 



Papilio Asterias, 200. 



Papirius, 142. 



Parasite of insect eggs, 164. 



Parsnip butterfly, 200. 



Parthenogenesis, 108. 



Pasteur on the sills vronn disease, 



63. 

 Pauropus, 149, 154, 158, 171. 

 Peach borer, 206. 

 Pear slug, 207. 

 Pea weevil, 188. 

 Peck, W. D., on the habits of Stylops 



and Xenos, 45, 46. 

 Pelopaius, 207. 

 Peutastonia, 148, 160. 

 Peripatus, 161. 

 Perla, 154. 

 Phora, 40. 

 Phymata, 211. 

 Phytocoris, 211. 

 Pickle worm, 57. 

 Pieris, 55, 197, 207. 



Pieris brassier, egg parasite of, 165 

 Pine plant louse, 220. 

 Pine weevil, 188, 199. 

 Piophila, 83. 

 Pirates, 210. 

 Pissodes strobi, 188. 

 Plan of structure, 186. 

 Plant louse, 220. 

 Platygaster, embryology of, 161. 

 Plum weevil, 194. 

 Podura, 183, 135, 144, 153, 154, 159, 170. 



Catch of, 139. Spring of, 137. 

 Podurids, the ancestors of the true 



insects, 157. 

 Poisonous insects, 214. 

 Polynema, embryology of, 164. 

 Poplar tree insects, 92. 

 Potato insects, 63. 

 Prelarval stage of ichneumons, 108. 

 Primitive band, 163, 166. 

 Primitive insects, 175. 

 Prionus, 93. 

 Procris, 60. 

 Protoleptus, 172, 174. 

 Pseudoneuroptera, 178. 

 Ptinus fur, 200. 

 Putnam, F. W., on habits of the bees, 



19, 26. 

 Pyrrharctia, 207. 



Kanatra, 210, 

 Rat-tailed fly, 76. 

 Reduvius, 210. 

 Reproduction, virgin, 168. 

 Respiration of insects, 171. 

 Retardation, theory of evolution by, 



167. 

 Rose beetle, 206. 

 Rose saw fly, 196. 

 Rose slug, 207. 

 Rotatoria, ancestors of Crustacea, 169. 



Salpa, 168. 



Saperda, 91, 208. 



Sarcoptes, l25. 



Saw fly, 196, 207. 



Saw of saw fly, 185. 



Schiodte on the mouth-parts of the 

 louse, 96. 



Scolopocryptops, 149. 



Scorpion, fossil, 158. 



Scudder on fossil insects of New 

 Brunswick and Illinois, 158. 



Seira, 143. 



Selandria, 207. 



Selandria rosae, 196. 



September, insects of, 216. 



Sesia, 194. 



Seventeen year locust, 212. 



Sexes, origin of, 152. 



Sheep tick, 85. 



Shrimp, 155. 



Siebold, T. von, on the ears of grass- 

 hoppers, xiv. 



Siebold on parthenogenesis, 168. 



Silk worm, 51. 



Silver witches, 128. 



Simulium, 73. 



Sitaris, 44. 



Smith, F., on stingless bees, 18. On 

 parasitic bees, 37. 



Smynthurus, 142. 



Species, origin of, 152. 



Sphinx, 194, 197, 200, 207. 



Spider, 1.55. 



Spider fly, 85. 



Spindle worm, 215. 



Spinneret of caterpillars, 183; of spi- 

 ders", 185. 



Spring, insects of, 187. 



Spring of Podura, 185. 



Spring tail, 127. 



Squash beetle, 194. 



Sciuasli bug, 204. 



Sting of bee, 185. 



Sting, origin of, 165. 



Stylops, 21, 45, 1.52, 179, 188. 



Sucker of insects, 183. 



Sugar mite, 124. 



Swarming of ants, 217. 



Syllis, 170. 



Sji-phus, 75. 



Tabanus, 74. 

 Tachiua, 39, 189. 

 Tailor bee, 26. 

 Tardigrade, 150, 160. 

 Teleas, embryology of, 166. 



