INDEX. 



Page. 



Abundance of species 189, 191 



AlChs gryllus 224 



iSSschna brevistyla 213, 221 



califomica 223 



constricta 190,205,213,233,251 



cyanea 224 



multicolor 223 



Agrion (Colopteryx) mactilatum 256 



pulchellum 260 



AJgse as enemies of nymphs 211 



Amphiagrion saucimn 259 



Anax Junius 187,190,204,205,213,233,251 



Anomalagrion hastatum 233 



Anopheles 220 



Ants as enemies of images 224 



Argia apicalis 215,256 



Argia moesta putrida 215, 256 



Argiope 224 



Bees eaten by imagos 215 



Belostoma 210 



Birds as enemies of imagos 222 



Birds as enemies of nymphs 211 



Calopteryx 256 



Celithemis elisa 253 



epontna 190,214,227,253 



Ceratopogon 207 



Choice of locality 1 90 



Choice of species 232 



Concealment 189 



Cor dulegaster maculatus 205 



Cordulia 233 



Corixa i94>202,204 



Crex grass 187,188 



Cypris 204,208 



Cypris inequivala 207 



Diet, benefits 204 



claims of injuries 204 



general character 202 



specific differences 202 



Diplax 238 



Distance traveled 191 



Diving beetles as enemies of nymphs 210 



Dromogomphus spoliatus 213,215 



Drosera binata 225 



Dytiscus larvae 202,204,210 



Economic relations 200, 218 



Enallagma antennatum 215, 227, 257 



calverti 257 



civile 215,233,257 



ebriiun 257 



geminatum 257 



hageni 214,225,227,233,244,257 



signatum 227,245,258 



Enemies of imagos 222 



Page. 



Enemies of nymphs 209 



Epiaeschna heros 233 



Epicordulia princeps 188, 190, 233, 243, 252 



Erythemis simpUcicolIis 190, 214, 223, 233, 241, 254 



Erythrodiplax berenice 233, 238 



Evidence from exuviae 230 



Evidence from feeding nymphs artificially to fish 230 



Evidence from fish bait 225 



Evidence from stomach contents 226 



Flies 220,224 



Food, amoimt consumed 206 



Food of imagos, ^schnids 213 



Damselfly 214 



Gomphids 212 



Libellulids 213 



Pantela flavescens 217,218 



Food of nymphs, Fairport, Iowa 201 



Hawaii 207 



Ithaca, N. Y 208 



Frogs as enemies of imagos 224 



Fungi as enemies of nymphs 211 



General conclusions 246 



Gizzard teeth 196, 199 



Gomphus amnicola 250 



extemus 236,250 



fraternus 212 



graslinellus 236,248 



notatus 250 



plagiatus 188,249 



submedianus 248,250 



vastus 213,250 



Hemiptera as enemies of nymphs 210 



Hetasrina americana 258 



Hyallella 208 



Hybrid nymph 240 



Hydra fusca as enemy of nymphs 210 



Imago 193 



Imagos as enemies of imagos 224 



Imagos as fish food 231 



Internal parasites 225 



Ischnura (Nehalennia) posita 259 



verticalis 189,215,227,233,258 



testes eurinus 258 



rectangularis 233,258 



uncatus 259 



unguiculatus 258 



vigilax 215 



Leucorrhinia intacta 190, 213, 225, 242, 253 



Libellula auripennis 238 



luctuosa 187, 190, 191, 214, 222, 233, 237, 239, 254 



pulchella 187,190,192,233,240,255 



semif asciata : . . . . 233 



Life history 192 



Lophonotus 225 



