INDEX 



409 



Scolopendrella, 78. 



Scolopendridae, 78. 



Scolytidae, 53, 61. 



Screech owl, 298, 299. 



Sculpin, 236, 252. 



Scutigera, 75, 78. 



Scutigeridae, 78. 



Scyphozoa, 214, 220. 



Sea-cows, 324. 



Sea-crayfish, 113. 



Sea-cucumbers, 204. 



Sea-lilies, 203. 



Sea-lions, 329. 



Sea-mats, 218. 



Sea-mouse, 148. 



Sea-spiders, 107. 



Sea-squirts, 218. 



Sea-urchins, 204 ; food and habitat of, 



199-200. 



Sea-walnuts, 219. 

 Seal, 328, 329. 

 Searcher, 46. 



Sedentary polychaeta, 148. 

 Selachians, 246. 

 Selachii, 252. 

 Semelidse, 189. 

 Serpent stars, 203; description and 



habitat of, 199. 

 Serpula, 151, 159; tube, 151. 

 Serpulidae, 159. 

 Sertularia, 210. 

 Sexton beetles, 48. 

 Sexual dimorphism of spiders, 92. 

 Shad, 253; range, 243-244. 

 Sharks, 252. 



Sharp-shinned hawk, 298. 

 Sheep, 326. 

 Sheep-tick, 70. 

 Sheep scab, 94. 

 Shipworms, 188. 

 Short-horned diptera, 64. 

 Short-horned grasshoppers, 51. 

 Short-winged beetles, 47. 

 Shrews, food of, 327. 

 Shrike, 289. 

 Shrimps, 104, 124; value of catch, 



111. 



Sididae, 131. 

 Silk-worms, 42. 



Silpha, 48. 



Silphidse, 48, 60. 



Silversides, 236, 252. 



Simia, 330. 



Simuliidae, 67. 



Simulium, 67. 



Siphonophora, 212-213, 220. 



Siphonata, 178. 



Siren, 255, 256. 



Sirenia, 331. 



Sirenidfe, 255, 266. 



Sitta, 287. 



Sittidae, 316. 



Skunks, 328. 



Sloths, 323; two-toed, 324. 



Slugs, 132, 160, 162 ; apparent absence 



of shell in, 162; economics of, 162; 



food of, 161-162; habitat of, 161; 



species of, 162. 

 Smelt, 230, 253 ; artificial propagation 



of, 231 ; economic importance of, 230; 



habitat of, 230; range of Atlantic 



form of, 230-231; value of Atlantic 



fishery, 231. 

 Snapping beetles, 51. 

 Snapping turtles, 275. 

 Snipes, habitat of, 305. 

 Snout beetles, 61. 

 Snow-bird, 285. 

 Snowy owl, 299. 

 Social bees, 31. 

 Social life of ants, 36. 

 Soft-shelled clams, 189. 

 Solaster, 197-198. 

 Solemyidae, 189. 

 Solenidae, 182, 188. 

 Song-sparrow, 285. 

 Song-thrush, 285. 

 Sow-bug, 112. 

 Spanish fly, 58. 

 Sparrow-hawk, 299. 

 Speckled tortoise, 276. 

 Spelerpes, color of, 259; development 



of, 261-262 ; habitat of, 260. 

 Sphex, 82. 

 Sphingidae, 22, 41. 

 Sphinx moth, 23. 

 Spiders, 80, 92 ; ballooning habits of, 



83-84; classification of, 85; food of, 



