Index 



Abedus, 185, 186, 203, 206 

 key to species: 206 



brachonyx, 206 



dilatatus, 205, 206 



hungerfordi, 205, 206 



immaculatus, 205, 206 



indentatus, 206 



macronyx, 206 



mayri, 205, 206 



signoreti, 205 

 Ablabesmyia, 413 

 Acalyptratae , 3 74 

 Acanthogyna, 124 

 Acentropus, 274, 275 

 Achorutes, 76 

 key to species: 77 



armatus, 77, 78 



viaticus, 77 

 Acanthocnema, 478, 479 

 Acilius, 307, 312, 313 



semisulcatus abbreviatus, 322 



semisulcatus simplex, 322 

 Acneus, 365, 366 

 key to species: adults, 366 



oregonensis, 366 



quadrimaculatus, 366 

 \croneuria, 160, 163, 180 

 key to subgenera and species: 180 



californica, 180 



delta, 180 



georgiana, 180 



obscura, 180 



pacifica, 180 



pumila, 180 



ruralis, 163, 180 



theodora, 180 



xanthenes, 180 

 Acroneurinae, 159, 180 

 Acrydiidae, 154 



Adaptations of aquatic insects, 5 

 Ademon, 290 



niger, 291 

 Adephaga, 293, 297, 298 

 Adoxomyia, 439 

 key to species: adults, 441 



appressa appressa, 441 



argentata, 441 



claripennis, 441 



lata, 441 



rustica, 44 1 

 Adoxomyiinae, 439, 440 

 Aedes, 391, 392 

 key to species: females, 395; male 

 genitalia, 396; larvae, 397 



bicristatus, 396, 397 



cataphylla, 396, 397 



cinereus, 396, 397 



communis, 396, 397, 398 



dorsalis, 396, 397, 398 



fitchii, 396, 397 



flavescens, 396, 397 



hexodontus, 396, 397 



increpitus, 396, 397 



nigromaculis, 396, 397 



pullatus, 396, 397 



squamiger, 396, 397 



sticticus, 396, 397 



taeniorhynchus, 396, 397 



varipalpis, 396, 397 



ventrovittis, 396, 397 



vexans, 396, 397 

 Aegialomyia, 445 

 Aepophilidae, 183 

 Aepophilus, 225 

 Aepopsis, 300 

 Aepus, 300 

 Aeschna, 120, 121 

 key to species: males, 122; females, 

 123; naiads, 123 



arida, 122 



californica, 122, 123 



canadensis, 122 



clepsydra, 122 



constricta, 122, 123 



dugesii, 122 



interrupta, 122, 123 



interrupta interna, 122 



interrupta nevadensis, 122 



manni, 122 



multicolor, 122, 123 



palmata, 122, 123 



subarctica, 122 



umbrosa 122, 123 



umbrosa occidentalis, 123 



umbrosa umbrosa, 123 



verticalis, 122, 123 



walkeri, 122, 123 

 Aeschnidae, 107, 109, 110, 119 

 key to genera; adults, 119; naiads, 

 120 

 Agabetes, 311 

 Agabetini, 311 

 Agabini, 310 



Agabinus, 307, 308, 310, 313 

 key to species: 321 



bifarius, 308 



glabrellus, 321 



sculpture 11 us, 321 

 Agabus, 307, 310, 313 

 key to species: adults, 319 



ancillus, 321 



approximatus, 321 



austini, 320 



bjorkmanaej 319 



brevicollis, 320 



confertus, 320 



discors, 320 



disintegratus, 317, 320 



griseipennis, 321 



hoppingi, 321 



ilybiiformis, 320 



lineellus, 319 



lugens, 320 



lutosus, 32 1 



morosus, 32 1 



oblituatus, 321 



obsoletus, 321 



•pandurus, 320 



regularis, 320 



seriatus intersectus, 320 



smithi, 321 



strigulosus, 320 



tristis, 320 



vandykei, 320 



walsinghami, 320 

 Agapetus, 243, 246 

 key to species: males, 246 



arcita, 246 



celatus, 247 



malleatus, 247 



marlo, 247 



orosus, 247 



taho, 247 

 Agathon, 389 



canadensis, 389 



doanei, 389 

 Agkistrocerus, 44 5 

 Agraylea, 254, 255 



multipunctata, 255 



saltesea, 255 

 Agriidae, 136 

 Agrion, 136, 137 



key to species: males, females, 

 naiads, 137 



aequabile californicum, 137 



maculatum, 137 

 Agrionidae, 109, 111, 136, 142 

 key to genera: adults, 136; naiads, 

 137 

 Agriotypidae, 289 



armatus, 289 



gracilis, 289 

 Agrypnia, 256, 257 



glacialis, 257 



vestita, 257 

 Alderflies, 229 

 Aleocharinae, 347 

 Allocapnia, 159, 161 



vivipara, 156 

 Allonarcys, 172, 173 

 Alloperla, 159, 162, 177 



489 



