INDEX 



401 



Desmognathus, color of, 250; habitat 

 of, 2<JO. 



Development, of beetle, 44; crayfish, 

 117; edentates, 333; effect of heat 

 on, 333; effect of light on, 333; of 

 egg, 115; frog's egg, 332; fly, 62; 

 general laws of, 335 ; grasshopper, 

 3-4 ; lobster, 115-117 ; Spelerpes, 261- 

 262; starfish, 193-194; Urodela,261. 



Diapheromera, 7. 



Didelphys, 323. 



Diemyctylus, 267; food of, 254; hab- 

 itat of, 254 ; life history of, 254-255. 



Digger wasp, 34, 43. 



Diplocardia, 143. 



Diplopoda, 74. 



Dipnoi, 248, 252. 



Diptera, 61,63, 72; injurious toman, 

 71; scavengers, 72; short-horned, 

 63; source of disease, 71. 



Discontinuous genera, 99-100. 



Distomum, 155. 



Divers, 60, 306. 



Division of labor in Cnidaria, 219; 

 physiological, 120. 



Dodo, extermination of, 314. 



Dogs, 328. 



Dogfish, 246. 



Dolphins, 324. 



Doryphora, 55. 



Downy woodpecker, 301. 



Dragon-fly, 9-10. 



Duckbill, 322. 



Duck-bill catfish, 247. 



Dytiscidae, 4(3, 56, 60. 



Dytiscus, 47, 138. 



E 



Eagles, 298. 

 Earwigs, 9. 

 Earthworm, 132-134; economics of. 



135; food of, 134; habits of, 132; 



regeneration of, 134; relationships 



of, 132 ; resistance of, 134. 

 Echidna, 322. 

 Echinarachnius, 201. 

 Echinoidea, 322. 

 Echinoids, 204. 

 Echiurus, 139. 



Economic importance, of beetles, 57; 

 birds, 311; decapods, 111; earth- 

 worms, 135; parasitic worms, 158; 

 protozoa, 228; slugs, 162; starfish, 

 193; smelt, 230. 



Ectopistes, 304. 



Ectoprocta, 143. 



Edentata, 323, 331. 



Edentates, discontinuity of, 323. 



Edible, birds' nests, 303; Carididae, 

 114; crabs, 108-109, 113; crayfish, 

 113; lobsters, 113. 



Eels, 253; description, distribution, 

 reproduction, 244. 



Egg, fertilization, 336 ; masses of tent 

 caterpillar, 26; nauplius, 115. 



Egrets, extermination of, 305. 



Elapidae, 277. 



Elaps, 277. 



Elateridae, 51, 61. 



Elephants, 327. 



Endoprocta, 143. 



Enemies of lobster, 102. 



English sparrow, 281; food of, 282; 

 spread of, in America, 281-282. 



Engraver beetles, 61. 



Ensis, 182. 



Entomophaga, 43. 



Eutomostraca, 97, 125. 



Eolis, 171. 



Ephemeridae, 10. 



Epiera, 80; web, 87. 



Erycinidae, 190. 



Euglena, 225-226, 229. 



Euglycera, 146, 159. 



Eunicidae, 159. 



Eupagurus, 106. 



Eupomatis, 235. 



Eutamia, 276. 



Even-toed ungulates, 326. 



Exotic species, increase of, 283. 



Extinct birds, 313. 



Eyestalks of decapods, 121. 



Falcons, 298. 

 Fasciolariidae, 175, 177. 

 Felis, 328. 

 Fiddler crabs, 110, 123. 



