498 

 Index 



Hydatophylax (cont.) 



hesperus, 263 

 Hydradephaga, 305 

 Hydraena, 295, 331, 332 

 pennsylvanica, 332 

 vandykei, 332, 333 

 Hydraenidae, 295, 297, 299, 326, 330 

 key to genera: adults, 332; larvae, 

 332 

 Hydraeninae, 326, 332 

 Hydraeomyces, 294 

 Hydrellia, 291, 465, 469 

 key to species: adults, 469 

 cruralis, 291 

 griseola hypoleuca, 469 

 griseola obscuriceps, 469 

 griseola scapularis, 291, 469 

 nasturtii, 469 

 proclinata, 469 

 tibialis, 469 

 williamsi, 469 

 Hydrellini, 465, 469 

 Hydrinini, 465 



Hydrobaeninae, 408, 410, 411, 417 

 Hydrobaenus, 408, 410, 411, 412, 417 

 Hydrobiinae, 338 

 Hydrobius, 295, 336, 338, 340, 341 



fuscipes, 34 1, 344 

 Ilydrocampinae, 274 

 Hydrocanthus, 325, 326 

 iricolor, 326 

 similator, 326 

 Hydrochara, 295, 336, 338, 340, 341 

 key to species: adults, 343 

 lineata, 343 

 rickseckeri, 343 

 Hydrochasma, 465 

 key to species: adults, 468 

 capax, 468 

 leucoprocta, 468 

 Hydrochinae, 337 

 Hydrochus, 297, 334, 337, 339 

 key to species: adults, 342 

 squamifer, 342 

 vagus, 342 

 variolatus, 342 

 Hydrometra, 218 

 key to species: 219 

 lillianis, 218, 219 

 martini, 218, 219 

 Hydrometridae, 182, 185, 187, 218 

 Hydromyza, 479 



confluens, 479 

 Hydronomi, 370 

 Hydroperla, 175 



Hydrophilidae, 293, 298, 299, 326, 334 

 key to genera: adults, 337; larvae, 

 339; pupae, 341 

 Hydrophilinae, 338 

 Hydrophiloidea, 299, 331 

 Hydrophilomyces, 295 

 Hydrophilus, 294, 335, 338, 340, 341 

 key to species: adults, 343 

 insularis, 343 

 triangularis, 296, 337, 343 

 Hydrophoria, 479 

 arctica, 481 

 divisa, 481 

 seticauda, 481 

 Hydrophorinae, 453 

 Hydrophorus, 449, 451, 453 

 key to species: adults, 453 

 agalma, 453 

 alter, 453 

 argentatus, 453 

 breviseta, 454 

 canescens, 453 



flavipennis, 453 



gratiosus, 453 



innotatus, 454 



magdalenae, 454 



pacificus, 454 



phiiombreus, 454 



phoca, 454 



praecox, 454 



plumbeus, 453 



sodalis, 454 

 Hydrophyleta, 290, 291 

 Hydropionea, 271 

 Hydroporinae, 306, 312 

 Hydroporini, 309 

 Hydroporus, 307, 308, 310, 313 

 key to species: adults, 317 



axillaris, 317 



barbarae, 317 



barbarensis, 317 



belfragei, 317 



bidessoides, 3 17 



fortis, 317 



funestus, 317 



hardyi, 317 



hirtellus, 318 



latebrosus, 317 



mannerheimi, 317 



occidentalis, 317 



palliatus, 317 



pervicinus, 3 18 



rossi, 3 17 



subpubescens, 317 



tademus, 3 17 



terminalis, 3 17 



vilis, 317 

 Hydropsyche, 237, 250, 251, 253 

 key to species: males, 253 



californica, 253 



cockerelli, 253 



occidentalis, 253 



oslari, 253 



philo, 253 

 Hydropsychidae, 237, 242, 250 

 key to genera: adults, 250; larvae, 

 251 

 Hydroptila, 254, 255 



acoma, 256 



argosa, 256 



rono, 256 



xera, 256 

 Hydroptilidae, 237, 241, 242, 253 

 key to genera: adults, 253; larvae, 

 254 

 Hydropyrus, 466, 472 



hians, 472 

 Hydroscapha, 346 



natans, 346, 347 

 Hydroscaphidae, 295, 297, 299, 346 

 Hydroscaphinae, 346 

 Hydrotrupes, 307, 310, 313 



palpalis, 308, 321 

 Hydrous, 335 

 Hydrovatini, 309 

 Hydrovatus, 307, 309, 313 



brevipes, 315 

 Hygrobiidae, 305 

 Hygroceleuthus, 449 

 Hygrotus, 307, 308, 310 

 key to species: adults, 316 



art us, 316 



collatus, 3 16 



curvipes, 3 16 



fraternus, 316, 317 



hydropic us, 316 



impressopunctatus, 316 



infuscatus, 316 



intermedius, 3 16 



lineellus, 316 



lutescens, 316 



masculinus, 316 



medialis, 316 



nigrescens, 316 



obscureplagiatus, 316, 317 



pedalis, 316 



sayi, 316 



sharpi, 316 



tumidiventris, 316 

 Hymeroptera, 71, 72, 289 



key to genera: adults, 289 

 Hyperodes, 370 

 Hyphydrini, 309 

 Hypoc harass us, 449, 451, 454 



pruinosus, 454 

 Hypogastruridae, 76 



key to genera: 76 

 Hyponeura, 142, 143 



lugens, 143 



Ichneumonidae, 290, 291 

 Ichneumonoidea, 289, 291 

 Illaphanus, 300 

 Ilybius, 307, 310, 313 

 key to species: adults, 321 

 fraterculus, 321 

 fuliginosus, 294 

 quadrimaculatus, 321 

 Ilythea, 465 

 key to species: adults, 469 

 caniceps, 469 

 flaviceps, 469 

 spilota, 469 

 Ilytheini, 465, 469 

 Indicators, pH, 66 

 Insect anatomy, 68 

 external, 68 

 internal, 69 

 Insect classification, 71 

 invaria group, 94, 95 

 key to species: adults, 98, nym 

 98 

 inermis, 98 

 infrequens, 98 

 mollitia, 98 

 Ioscytus, 225 

 key to species, 225 

 franciscanus, 225, 226 

 nasti, 225, 226 

 politus, 225 

 variety flavicosta, 225 

 Iron, 85, 87 

 key to species: adult males, 

 nymphs, 88 

 albertae, 88 

 dulciana, 88 

 lagunitas, 88 

 longimanus, 88 

 sancta-gabriel, 88 

 Ironodes, 85, 88 

 key to species: adult males, 

 nymphs, 88 

 californicus, 88 

 geminatus, 88 

 lepidus, 88 

 nitidus, 88 

 Ironopsis, 85, 88 



grand is, 88 

 Ischnura, 142, 149 

 key to species: males, females, 

 naiads, 151 

 barberi, 150, 151 

 cervula, 150, 151 

 defixum, 150 

 demorsa, 150, 151 





phs, 



150; 



