491 

 Index 



lindsleyi, 467 

 Assipala, 444 

 Asyndetus, 449 

 Atherix, 376, 443 



variegata, 443 

 Athripsodes, 264, 265 



annulicornis, 265 



tarsipunctatus, 265 



trans vers us, 265 

 Athyroglossa, 466 

 key to species: adults, 466 



glabra, 466 



glaphyropus, 467 



melanderi, 467 

 Atissa, 464 

 key to species: adults, 467 



litoralis, 467 



pygmaea, 467 

 Atissini, 464, 467 

 Atoperla, 160, 163 

 Atopsyche, 243 

 Atractelmis, 358, 361 



wawona, 361 

 Atrichopogon, 424, 425, 427, 428 

 keys to species: adults, male gen- 

 italia, 429 



arcticus, 429, 430 



fusculus, 429, 430 



levis, 429, 430 



minutus, 429, 430 



occidentalis, 429, 430 



transversus, 429, 430 



websteri, 429, 430 

 Attaneuria, 180 

 attenuata group, 94 

 Atylotus, 445 



incisuralis, 448 

 Autoicomyces, 294 

 Axysta, 466 



Backswimmers, 196 



Baetidae, 82, 88; wing venation, 83; 

 nymph, 83 

 key to subfamilies: adults, 88, nvmphs, 

 89 

 Baetinae, 89, 99 

 key to genera: adult males, 99; 

 nymphs, 101 

 Baetis, 99, 101 

 key to species: adult males, 101 



adonis, 102, 104 



alius, 102, 104 



bicaudatus, 102, 104 



devinctus, 102, 104 



diablus, 102, 104 



insignificans, 102, 104 



intercalaris, 102 



intermedius, 104 



leechi, 101, 104 



moffatti, 102 



palisadi, 102, 104 



piscatorius, 104 



sulfurosus, 102, 104 



thermophilos, 102, 104 



tricaudatus, 102, 104 

 Baetisca, 105 



obesa, 105 

 Baetiscinae, 89, 105 

 Baetodes, 89, 99, 100 

 Bagous, 369, 370 

 key to species: adults, 371 



americanus, 370 



californicus, 371 



chandleri, 370 



longirostris, 370 



restrictus, 371 



tingi, 371 

 Banksiola, 256 



crotchi 257 

 Baraeidae, 237, 242, 243 

 Basiaeschna, 120, 121 

 Bathythrix, 327 



gyrini, 327 



pimplae, 327 

 Batrachomatus, 309 

 Beach flies, 475 

 Beloneuria, 180 

 Belonia, 125, 126, 133 



saturata, 133 

 Belostoma, 185, 186, 203, 206 

 key to species: 206 



apache, 206 



bakeri, 206 



boscii, 206 



flumineum, 205 



fusciventre, 206 



minor, 206 

 Belostomatidae, 182, 185, 186, 187, 

 203 

 key to genera: adults, 206; nymphs, 

 206 

 Benacus, 203, 206 



griseus, 204, 206 

 Beridinae, 439 

 Berosinae, 338 



Berosus, 297, 334, 338, 339, 341 

 key to species: adults, 342 



californicus, 342 



fraternus, 342 



infuscatus, 342 



ingeminatus, 342 



maculosus, 342 



metalliceps, 342 



punctatissimus, 342 



striatus, 342 



styliferus, 342 

 Bezzia, 426, 428 

 key to species: adults, 436 



biannulata, 437 



bilineata, 437 



bivittata, 437 



coloradensis, 437 



expolita, 437 



flavitarsis, 437 



glabra, 437 



granulosa, 437 



modocensis, 437 



opaca, 437 



pulverea, 437 



punctipennis, 436 



setulosa, 437 



sordida, 437 



varicolor, 437 

 Bibiocephala, 389 



comstocki, 389 



grandis, 389 

 bicolor group, 94, 95, 98 



lodi, 98 

 Bidessini, 309 

 Bidessonotus, 309 

 Bidessus, 307, 309, 313 

 key to species: adults, 315 



affinis, 315 



cinctellus, 315 



leachi, 315 



ornatellus, 3 16 



pictodes, 3 15 



plicipennis, 315 



quadripustulatus, 315 



subplicatus, 315 



subtilis, 316 

 Bittacomorpha, 386 



occidentalis, 386 



Mm aoomorphella, 386 



sackenii, 386 

 Bittaeomorphinae, 386 

 Black flies, 401 

 Bledius, 331 

 Blepharicera, 389 



Jordan i, 389 



osten-sackeni, 389 

 Blephariceridae, 373, 375, 376, 389 



key to genera: adults, 389 

 Bodega gnat, 428 

 Bolbodimyia, 445 

 Bolbodimyiini, 445 

 Boreochlus, 408, 410, 111, 111 

 Boreodroma, 457 



maculipes, 458 

 Bourletiella, 78 



hortensis, 78 

 Boyeria, 119, 121 

 Brachybamus, 370 



electus, 370 

 Brachycentridae, 242, 243 

 key to genera: adults, 268; larvae, 

 268 

 Brachycentrus, 268 



americanus, 268 

 Brachycera, 375, 376 

 Brachycercus, 99 

 Brachydeutera, 465, 4 70 



argentata, 4 70 



hebes, 470 

 Brachymesia, 124, 125 

 Brachymetra, 184 

 Brachynus, 328 



janthinipennis, 328 

 Brachyptera, 155, 159, 161, 170 

 key to subgenera and species: males, 

 170 



banksii, 172 



californica, 172 



grinnelli, 172 



kincaidi, 172 



nigripennis, 172 



occidentalis, 171 



pacifica, 172 



pallida, 172 



pallidura, 172 



raynoria, 171, 172 



vanduzeei, 172 

 Brachyvatus, 309 

 Braconidae, 290 

 Brathinidae, 298 

 Brechmorhaga, 125, 135 



mendax, 135 

 Brennania, 444 



hera, 446 

 Brillia, 408, 410, 412, 417 

 Brine flies, 372 

 Brychius, 303, 304 

 key to species: adults, 304 



hornii, 304 



pacificus, 304 

 Bryobiota, 348 



bicolor, 348 

 Buenoa, 185, 186, 197 

 key to species: males, 199 



margaritacea, 199 



omani, 199 



scimitra, 199 



uhleri, 199 

 Buffalo gnats, 372, 401 

 Burrowing water beetles, 324 



Caddisflies, 237 

 Caeninae, 89, 99 

 key to genera: adults, 99; nymphs, 99 



