502 

 Index 



Notiphila, 465, 470 

 key to species: 470 

 atrisetis, 470 

 erythrocera, 4 70 

 loewi, 4 70 

 macrochaeta, 470 

 occidentalis, 470 

 olivacea, 470 

 pulchifrons, 470 

 sicca, 470 

 Notiphilinae, 464, 469 

 Notomicrus, 297, 324, 325 

 Notonecta, 185, 186, 197, 291 

 key to species, 198 

 badia, 198 

 borealis, 198 

 hoffmanni, 198 

 indica, 198 

 kirbyi, 198 

 maculata, 198 

 ochrothroe, 198 

 shooterii, 198 

 spinosa, 199 

 undulata, 198 

 unifasciata, 189, 198 

 unifasciata andersoni, 198 

 Notonectidae, 182, 185, 186, 187, 196 

 key to genera: adults, 198; nymphs, 

 198 

 Notonectoidea, 197 

 Notophilini, 465, 470 

 Nyctiophylax, 249 

 Nymphula, 271, 275, 277 

 iccusalis, 291 

 gurgitalis, 282 

 obliterans, 282 

 occidentalis, 282 

 Nymphuliella, 274, 277 

 Nymphulinae, 271, 274 

 key to genera: adults, 274; male gen- 

 italia, 275; female genitalia, 275; 

 larvae, 277; genera and species: 

 superficial characters, 277; male 

 genitalia, 280; female genitalia, 

 282; larvae, 282 

 Nymphulini, 274 

 Nymphulites, 274 



Occidentalia, 291 



comptulatalis, 291 

 Ocellovelia, 184 

 Ochrotrichia, 254, 255 



lometo, 255 



mono, 255 



trapoiza, 255 

 Ochteridae, 183, 185, 186, 187, 210 

 Ochterus, 211 



banksi, 211 



barberi, 211 

 Ochthebius, 330, 332 

 key to species: adults, 333 



bruesi, 331 



costipennis, 333 



cribicollis, 333 



discretus, 333 



fossatus, 333 



holmbergi, 333 



interruptus, 333 



laevipennis, 333 



lineatus, 333 



martini, 333 



punticollis, 333 



rectus, 332, 333 



sculptus, 333 



vandykei, 297, 332, 333 

 Ochthera, 465, 471 



key to species: adults, 471 



cuprilineata, 471 



mantis, 471 



melanderi, 471 



pilimana, 471 

 Octogomphus, 114, 115 



specularis, 115 

 Ocydrominae, 457 

 Odonata, 72, 106 

 head and thorax, 106 

 wing venation, 107 

 oviposition, 107 

 naiads, 108 

 copulation, 108 

 collecting methods, 109 

 key to families: adults, 109; nymphs, 

 109 

 Odontella, 76 

 Odontoceridae, 242, 243, 263 



key to genera: adults, 263 

 Odontomyia, 442 

 Oecetis, 264, 265 



avara, 265 



disjuncta, 265 



inconspicua, 265 



ochracea, 265 

 Oedenops, 465 



nuda, 470 

 Oemopteryx, 171 

 Oidematops 

 Oligochaetus, 449 

 Oligoneuria, 105 

 Oligoneuriinae, 89, 105 

 Oligophlebodes, 259, 261 



sierra, 261 

 Oligoplectrum 268 



echo, 268 

 Oligostigma, 274, 277 

 Oligostigmoides, 274, 277 

 Oligostomis, 256, 257 

 Omicrus, 339 

 Omisus, 409 

 Omophronidae, 297, 298 

 Onychiuridae, 75, 76 



key to genera: 76 

 Onychiurus, 76 

 key to species: 76 



armatus, 76 



cocklei, 76 



fimetarius, 76 

 Onychylis, 370 



nigrirostris, 370 

 Oosternum, 339 

 Ophiogomphus, 114, 115 

 key to species: males, 115; females, 

 115; naiads, 115 



bison, 115 



montanus, 115 



morrisoni, 115 



morrisoni nevadensis, 115 



occidentalis, 115 



occidentalis californicus, 115 



phaleratus, 115 



sequoiarum, 115 



severus, 115 

 Oplonaeschna, 119, 120, 121 

 Optioservus, 358, 360, 362 

 key to species: adults, 363 



canus, 363 



divergens, 363 



quadrimaculatus, 363 



seriatus, 363 

 Ora, 352, 353 



Orders of aquatic insects, key to, 71 

 Ordobrevia, 358, 360, 361 



nubifera, 361 

 Orectochilinae, 329 



Orectogyrus, 294 



specularis, 294 

 Oreodytes, 307, 310, 313 

 key to species: adults, 319 



abbreviatus, 319 



bisulcatus, 319 



obesus, 319 



picturatus, 319 



semiclarus, 319 



subrotundus, 319 

 Oreogyrinus, 329 

 Oreothalia, 457 

 Ormosia, 379, 381 



burneyensis (et seq.) 383 



cornuta 



heptacantha 



legata 



leptorhabda 



manicata 



modica 



pernodosa 



profunda 



sequoiarum 



stylifer 



taeniocera 



tahoensis 



tricornis 

 Oroperla, 173 

 Oropsyche, 251 

 Orthemis, 124, 126, 133 



ferruginea, 133 

 Orthopodomyia, 391, 392 



californica, 395 

 Orthoptera, 71, 72, 154 

 Orthorrhapha, 375, 376 

 Orthotrichia, 254 

 Osmoregulation, 6 

 Osmylidae, 234 

 Osobenus, 174 

 Ostrocerca, 165, 167 

 Oxycera, 439, 440 

 Oxyelophila, 271, 275, 277 

 Oxyethira, 254, 255 



pallida, 255 



Pachydiplax, 124, 126, 129 



longipennis, 129 

 Pachydrus, 309 

 Pachygastrinae, 439 

 Paleagapetus, 243, 246 



nearcticus, 246 

 Paleodictyoptera, 3 

 Paleoptera, 3 

 Palmacorixa, 191 

 Palpicornia, 334 

 Palpomyia, 426, 428, 435 

 key to species: females, male gen- 

 italia, 436 



aldrichi, 436 



armatipes, 436 



essigi, 436 



flavipes, 436 



kernensis, 436 



linsleyi, 436 



nigripes, 436 



trifasciata, 436 

 Paltothemis, 125, 135 



lineatipes, 135 



russata, 135 

 Pangonia, 446 



dives, 446 

 Pangoniinae, 444 

 Pangoniini, 444 

 Pantala, 125, 126, 136 

 key to species: adults, naiads, 136 



flavescens, 136 



