INDEX 



489 



Iguana, 310, 320, 333. 



incisors, 405. 



infantile paralysis, 100. 



Infusoria, 233. 



ingestion of food, 223 (see digestion). 



injurious, insects, to field crops, 33~35 ', 

 to fruits, 39-42 ; to garden vegetables, 

 35~39! to the household, 57-61; to 

 shade trees, 42-47. 



insectivores, 421. 



insects, 7 ; and disease, 98-101 ; bene- 

 ficial, 62-72 ; classification of, 107 ; 

 food for man, 67 ; injurious, 32-61 ; 

 parasitic, 71-72; predaceous, 70-71; 

 scavenger, 67. 



intestine, of earthworm, 171; of grass- 

 hopper, 12, 14; of mussel, 147, 151 

 (see digestion). 



invertebrates, 7, 234. 



irritability, 234. 



jaguar, 429. 



jaws, of grasshopper, 13 ; of snail, 160, 



161 (see skeleton), 

 jay, 375, 389- 

 jellyfish, 7, 207. 

 jewfish, 288. 

 jigger, 125. 

 joints, 256. 



kallima butterfly, 29, 30. 



kangaroo, 421. 



katabolism, 220. 



kidney, of frog, 252; of mammal, 407; 



of mussel, 147, 151 (see excretion), 

 killdeer, 342, 353, 355, 367. 

 kingfisher, 344, 355, 368, 372. 

 kite, 370. 

 kiwi, 362, 363. 



labial palps, of mussel, 147, 150. 



labium, of grasshopper, 13. 



Laboratory, Marine Biological, 480. 



labrum, of grasshjpper, 13. 



lac, 65. 



lacteals, 406. 



lamprey, brook, 270. 



lamprey eel, 268-270. 



lark, meadow, 380; prairie horned, 342, 



354- 



larva, 20. 

 larynx, 406. 



laws, game, 464. 



leeches, 175. 



legs, of grasshopper, IO-11 ; of honeybee, 



27-29. 



lemming, 415-416. 

 lemur, 443, 444. 

 lens, 261, 408 (see eye). 

 Lepidoptera, 108. 

 Leucosolenia, 211, 212. 

 lice, biting, 54 ; body, 54, 55 ; chicken, 



54, 55 ; crab, 54, 55 ; elm-bark, 46 ; 



head, 54, 55; plant, 35, 36, 41-42; 



sucking, 54; wood, 141. 

 life, origin of, 244. 

 Limax, 161. 

 Linnasus, 67, 103, 473. 

 lion, mountain, 429. 

 liver, of frog, 247, 253 ; of mussel, 147, 



151- 



lizards, 319-322. 

 llama, 450. 



lobster, 130, 131, 142. 

 locomotion, of Ameba, 223; of crayfish, 



133; of earthworm, 168; of fish, 272; 



of grasshopper, 9-13 ; of insects, 24- 



25; of mammals, 402 ; of mussel, 146; 



of snail, 159. 

 locust, Carolina, 9, 14, 17; differential, 



21, 22; migratory, 20; red-legged, 21, 



22; Rocky Mountain, 18. 

 locust borer, 46. 

 lungs, of bird, 349; of frog, 247, 250; of 



mammals, 406; of snail, 159, 161 ; of 



spider, 113, 114. ' 

 Lymncea, 162, 163. 

 lymph, 250. 

 lymphatic system, 406. 

 lynx, 428. 



mackerel, 288, 289. 



macronucleus, 219. 



maggot, 20. 



Malacostraca, 144. 



malaria, 87-93, 227. 



Malpighian tubules, 12, 16. 



Mammalia, 7, 234. 



mammals, 398-459; aquatic, 398; ar- 

 boreal, 398 ; circulation in, 406 ; claws 

 of, 401 ; color of, 400 ; digestion in, 

 403; domesticated, 450-451; ear of, 

 409 ; egg laying of, 419-42O ; excretion 

 in, 407 ; eye of, 408 ; flesh-eating, 423- 



