INDEX 



Acadian period, 46, 47 



Adaptations: to aquatic life, 101; to 

 light, 101 



Adder's tongue, Erythronium ameri- 

 canum 



Aftonian glacial period, 57 



Alumroot, Heuchera americana 



Amphibians, Frogs, Salamanders, 

 Toads: 



Bufo lentiginosus, toad, 102, 152, 255 



Chorophilus nigritus, spring peeper, 94 



Diemictylus viridescens, the eft, 188, 

 189 



Hyla: 



pickeringii, 165, 166, 219 

 versicolor, 165, 1 66, 219 



Plet&don cinereus, red-backed sala- 

 mander, 219 



Rana: 



catesbeiana, bullfrog, 240 

 clamata, green frog, 240 

 palustris, pickerel frog, 240, 241 

 sylvatica, 219, 220 

 virescens, leopard frog, 240 



Amphibole, 72 



Amygdaloid, 73 



Anacharis, see Flowering plants 



Anemone, A ncmonella thallictroides 



Angelica, see Flowering plants 



Animal census, 150 



Ant, carpenter, 165 



Anticline, 18 



Ant-lion: association, 150, 159, 163; 

 Myrmelion, 160 



Aphids, 165 



Aquatic insects, adaptations of, 104 



Aquatic leaf form, 102, 103 



Arachnida, Spiders, Mites: 



Argiope, the orb weaver, 188, 190 



Dendryphantes octavus, 158 



Dolomedes sexpunctatus, diving spi- 

 der, 104 



Epeira gigas, 220, 223, 225 



Hydrachna, red water mite, 94 



Limnochares aquations, water mite, 



Lycos a wrightii, burrowing spider, 99, 



154 



Neocosoma arabesca, 220, 223, 225 

 Pardosa lapidicina, 260, 261 

 Phidippus audax, 223, 225 

 Philodromus alaskensis, 158 

 Tetragnatha laboriosa, long-bodied 



spider, 270, 271 

 Theridium spirale, 159 

 Trochosa cinerea, sand-colored spider, 



152,153 

 Xysticus formosus, 158 



Arcella, 290 

 Archaeozoic, 30, 31, 41 

 Arrowhead, Sagittaria latifolia 

 Ash-elm association, 241 

 Aster blossom, spider of, 108 

 Aster, rush, Aster junceus 

 Atmosphere, beginnings, 26 



Back swimmer, see Hemiptera 



Baneberry, Actaea 



Bare-bottomed ponds, 1 79 



Basalt, 19, 75, 76 



Bat, brown, see Mammals 



Beach association, 115, 119 



Bearberry, Arctostaphylos Uva-ursi 



Bee, carpenter, 219 



Beetles, see Coleoptera 



Beggar-ticks, Bidens frondosa 



Bedstraw, Galium aparine 



Bellflower, marsh, Campanula apari- 



noides 



Bellwort, Uvularia grandiftora 

 Bender, see Crustaceae 

 Bergamot, Monarda fistidosa 

 Betelgeuse, 21 



