INDEX 



169 



Mutual aid, a factor of evolution, 



133 

 My a arenaria, 



growth, 114 



life history, 114 

 Myriapods, 



collecting, 58 



systematic literature, 71 



Nassa obsolete, 110 

 Natural conditions of existence, 96 

 Natural environments, 26 

 Natural history, 18 



American lobster, 113 



Amia calva L., 117 



Amphithoe, 113 



honey-bee, 109 



larvae of Donaciinje, 109 



starfish, 115 



surveys, 23, 30 

 Natural preserves, 34, 38 

 Naturalist's Directory, 53 

 Nature, 



and nurture* 17 



control, 33 



Nature's foresters, 124 

 Nearctic Hemiptera-Heteroptera, 



catalogue, 71 

 Nearctic spiders, 72 

 Necturus, behavior, 121 

 Nematocerous Diptera, 



aquatic, 75 



aquatic, stages, 75 

 Nepa apiculata Uhler, death-feign- 

 ing, 118 

 Nervous system, 



integrative action, 98 



origin of, in sponges, 116 



regulatory action, 98 

 Nestling birds, food, 128 

 Nests, 



ants, 127 



collecting birds', 58 

 New Mexico, 



ecological distribution of animal 

 life in, 148 



insects, 148 



reptiles, 148 

 New York, 



insect galls, 143 



State entomologist's reports, 



74 

 Nomenclature, 



ecological, for plants, 60 



phytogeographical, 22 

 Non-ecological surveys, 31 

 Normal, 



as ideal, 27 



conditions, 27 



departure from, 98 



processes of nature, 26 

 North Carolina, oyster industry, 



112 



Notebook, aluminum, 44 

 Note slips, 37, 44 

 Note taking, 42, 45, 61 

 Noxious animals, introducing, 124 

 Numbering specimens, 50, 51 

 Numerals, 69 



Nurmijarvi Lake, fauna and vege- 

 tation, 139 



Nurture and nature, 17 

 Nutrition of Arthropods, affected 



by cave life, 101 

 Nymphs, 



dragon-fly, 76 



Mayfly, 76 



Zygoptera, keys, 76 



Oak gall flies, and oak galls, 143 



Oceanography, 21 



Odonata, 



life histories, 76 



transformations described, 72 

 (Ecology, see Ecology 

 Oligochaeta, 58 



Ontario, Entomological Society of, 

 index to thirty annual reports, 

 72 

 Optima, 98 



development, 94 



of Chsetognatha, 115 



physiological, 27 



vital, 27, 94 

 Optimum, 30, 94 



associations!, 94 



departure from, 98 



vital conditions, 99 



vital, in caves, 144 

 Orange, insects affecting the, 75 



