| Abedus | Imago - hemelytra | Merritt p. 272 fig. 15.12 |
| Abedus indentatus | Imago - dorsal view | Merritt p. 272 fig. 15.9 |
| Ablabesmyia | Larva - lateral view | Bouchard p. 176 fig. 13.72 |
| Acanthametropus | Larva - gill 4 | Merritt p. 134 fig. 11.37 |
| Acentrella | Larva - dorsal view | Fauceglia p. 95 |
| Acentrella | Subimago - male lateral view | Fauceglia p. 96 |
| Acentrella | Subimago - female lateral view | Fauceglia p. 97 |
| Acentrella | Larva - leg | Merritt p. 142 fig. 11.88 |
| Acentrella | Larva - fore leg | Bouchard p. 55 fig. 4.34 |
| Acentrella | Imago - male lateral view | Fauceglia p. 98 |
| Acentrella | Imago - head & thorax lateral | Merritt p. 155 fig. 11.171 |
| Acentrella | Imago - female lateral view | Fauceglia p. 98 |
| Acentrella | Larva - immature dorsal view | Fauceglia p. 95 |
| Acentrella alachua (Pseudocloeon alachua) | Imago - male genitalia | Berner - p. 70 fig. 80 |
| Acentrella insignificans (Baetis insignificans) | Larva - abdomen | Arbona p. 157 fig. 52 |
| Acentrella insignificans (Baetis insignificans) | Imago - hind wing | Arbona p. 177 fig. 70 |
| Acentrella parvula (Pseudocloeon parvulum) | Larva - abdomen dorsal | Berner - p. 82 fig. 169 |
| Acentrella parvula (Pseudocloeon parvulum) | Imago - male genitalia | Needham p. 725 c |
| Acentrella parvula (Pseudocloeon parvulum) | Larva - 4th gill | Berner - p. 76 fig. 116 |
| Acentrella turbida (Pseudocloeon carolina) | Imago - genitalia | Arbona p. 177 fig. 67 |
| Acentrella turbida (Pseudocloeon carolina) | Imago - male genitalia | Needham p. 725 a |
| Acentrella turbida (Pseudocloeon carolina) | Larva - abdomen | Arbona p. 157 fig. 56 |
| Acentrella turbida (Pseudocloeon carolina) | Larva - nymph | Schwiebert p.310a-32 |
| Acentrella turbida (Pseudocloeon carolina) | Subimago - female dun | Caucci p. 256+ CP XXII c |
| Acentrella turbida (Pseudocloeon carolina) | Subimago - male dun | Caucci p. 256+ CP XXII d |
| Acentropus niveus | Imago - adult | McCafferty p. 278 fig. 15.04 |
| Acerpenna | Larva - labial palp | Merritt p. 142 fig. 11.89 |
| Acerpenna pygmaea | Larva - gill | Knopp p. 048 |
| Acerpenna pygmaea (Baetis pygmaeus) | Imago - hind wing | Needham p. 685 l |
| Acerpenna pygmaea (Baetis pygmaeus) | Larva - nymph | Schwiebert p.310a-9 |
| Acerpenna pygmaea (Baetis pygmaeus) | Larva - labial palp | Berner - p. 74 fig. 106 |
| Acerpenna pygmaea (Baetis pygmaeus) | Larva - gill | Arbona p. 157 fig. 51 |
| Acerpenna pygmaea (Baetis pygmaeus) | Imago - male genitalia | Berner - p. 70 fig. 82 |
| Acerpenna pygmaea (Baetis pygmaeus) | Larva - 7th gill | Berner - p. 76 fig. 129 |
| Acerpenna pygmaea (Baetis pygmaeus) | Imago - hind wing, male | Berner - p. 60 fig. 32 |
| Acerpenna pygmaea (Baetis pygmaeus) | Larva - dorsal view | Berner - p. 118 plate 2 |
| Acerpenna thermophilos (Baetis thermophilos) | Imago - hind wing | Needham p. 685 g |
| Acilius | Imago - hind leg | Merritt p. 421 fig. 20.081 |
| Acilius semisulcatus | Imago - adult | McCafferty p. 217 fig. 13.17 |
| Acneus | Imago - dorsal view | Merritt p. 443 fig. 20.202 |
| Acneus | Larva - dorsal view | Merritt p. 442 fig. 20.196 |
| Acneus | Larva - last abd. seg. dorsal | Merritt p. 442 fig. 20.194 |
| Acneus | Larva - ventral view | Merritt p. 442 fig. 20.195 |
| Acroneuria carolinensis | Larva - dorsal view | Bouchard p. 42 fig. 3.27 |
| Acroneuria evoluta | Larva - larva | McCafferty p. 162 fig. 09.23 |
| Acroneuria evoluta | Larva - larva | McCafferty p. CP VIII fig. 044 |
| Acroneuria evoluta | Imago - adult | McCafferty p. CP VIII fig. 045 |
| Acroneuria lycorias (Acroneuria lycoris) | Larva - nymph | Schwiebert p. 86a fig. 3 |
| Acroneuriinae | Larva - head | McCafferty p. 162 fig. 09.26 |
| Acroneuriinae | Larva - head | McCafferty p. 162 fig. 09.27 |
| Actidium | Imago - antenna | Merritt p. 412 fig. 20.037 |
| Actidium | Imago - dorsal view | Merritt p. 412 fig. 20.036 |
| Adicrophleps | Larva - case | McCafferty p. 259 fig. 14.48 |
| Adicrophleps hitchcocki | Larva - case | Merritt p. 353 fig. 18.17 |
| Adicrophleps hitchcocki | Larva - head & prosternum ventral | Merritt p. 352 fig. 18.6 |
| Adicrophleps hitchcocki | Larva - mesonotum dorsal | Merritt p. 352 fig. 18.10 |
| Aedes stimulans | Larva - head dorsal | Bouchard p. 167 fig. 13.33 |
| Aegialites | Imago - adult | McCafferty p. 351 fig. 17.15 |
| Aegialites | Larva - abdominal apex | Merritt p. 406 fig. 20.019 |
| Aegialites | Larva - dorsal view | Merritt p. 406 fig. 20.018 |
| Aegialites (Aegilites) | Imago - dorsal | Merritt p. 412 fig. 20.041 |
| Aeshna constricta (Aeschna constricta) | Larva - nymph | Schwiebert p.150a-2 |
| Aeshna interrupta | Larva - head | McCafferty p. 139 fig. 08.22 |
| Aeshna interrupta | Larva - larva | McCafferty p. 139 fig. 08.21 |
| Aeshna umbrosa | Larva - antenna | Bouchard p. 69 fig. 5.17 |
| Agabus | Imago - hind femur | Merritt p. 424 fig. 20.091 |
| Agabus | Larva - larva | McCafferty p. 215 fig. 13.09 |
| Agapetinae | Larva - thorax | McCafferty p. 254 fig. 14.31 |
| Agapetus | Larva - head ventral | Merritt p. 355 fig. 18.31 |
| Agapetus | Larva - mesonotum dorsal | Merritt p. 354 fig. 18.28 |
| Agapetus | Larva - pronutum lateral view | Merritt p. 355 fig. 18.38 |
| Agarodes | Larva - head dorsal | Merritt p. 325 fig. 17.71 |
| Agarodes | Larva - head, thor. & ab1 lateral | Bouchard p. 124 fig. 10.37 |
| Agarodes | Larva - anal prolegs dorsal | Bouchard p. 126 fig. 10.44 |
| Agarodes | Imago - head, pro & mesonotum dorsal | Merritt p. 337 fig. 17.151 |
| Agarodes | Larva - anal prolegs dorsal | Merritt p. 325 fig. 17.72 |
| Agarodes distinctus (Agarodaes distinctus) | Larva - lateral view | Bouchard p. 134 fig. 10.63 |
| Agarodes libalis | Larva - head lateral view | Merritt p. 383 fig. 18.264 |
| Agarodes libalis | Larva - metathorax dorsal | Merritt p. 383 fig. 18.260 |
| Agarodes libalis | Larva - pronotum lateral view | Merritt p. 383 fig. 18.258 |
| Agnetina capitata | Larva - abdominal ventrum | Merritt p. 232 fig. 14.56 |
| Agraylea | Imago - head, pro & mesonotum dorsal | Merritt p. 334 fig. 17.111 |
| Agraylea | Larva - hind leg lateral | Merritt p. 361 fig. 18.88 |
| Agraylea | Pupa - abdomen dorsal | Merritt p. 328 fig. 17.80 |
| Agraylea | Larva - case | Merritt p. 363 fig. 18.102 |
| Agraylea | Larva - case | LaFontaine p. 243 - a |
| Agraylea | Imago - lateral view | LaFontaine p. 243 - b |
| Agraylea | Imago - wings dorsal | Merritt p. 334 fig. 17.112 |
| Agrenia bidenticulata | Ametabolous - lateral view | Bouchard p. 22 fig. 2.60 |
| Agrypnia | Larva - head dorsal | Bouchard p. 123 fig. 10.31 |
| Agrypnia | Larva - head & throax | McCafferty p. 257 fig. 14.41 |
| Agrypnia | Larva - case | McCafferty p. 258 fig. 14.42 |
| Agrypnia | Larva - retreat | Merritt p. 311 fig. 17.16 |
| Agrypnia vestita | Larva - head & prosternum ventral | Merritt p. 379 fig. 18.223 |
| Agrypnia vestita | Larva - middle coxa ventral | Merritt p. 379 fig. 18.227 |
| Aleochara | Imago - hind coxae and legs | Merritt p. 439 fig. 20.177 |
| Allocapnia | Larva - abdomen lateral | Bouchard p. 82 fig. 6.26 |
| Allocapnia | Larva - dorsal view | Bouchard p. 80 fig. 6.11 |
| Allocapnia | Larva - wing pads | Merritt p. 229 fig. 14.36 |
| Allocapnia | Imago - adult | McCafferty p. 157 fig. 09.13 |
| Allocapnia | Imago - adult | McCafferty p. 157 fig. 09.14 |
| Allocapnia | Larva - thorax & abdomen | McCafferty p. 156 fig. 09.10 |
| Allocapnia granulata | Larva - terminal abdomen dorsal | Merritt p. 225 fig. 14.12 |
| Allocapnia granulata | Larva - wing pads (male) | Merritt p. 229 fig. 14.37 |
| Allocapnia granulata | Larva - abdominal venter | Merritt p. 225 fig. 14.11 |
| Allocapnia granulata | Larva - larva | McCafferty p. CP VII fig. 040 |
| Allocapnia vivipara | Imago - adult | McCafferty p. 157 fig. 09.12 |
| Allocapnia vivipara | Larva - dorsal view | Bouchard p. 83 fig. 6.31 |
| Allocapnia vivipara | Larva - meso & metathorax dorsal | Bouchard p. 82 fig. 6.28 |
| Allocosmoecus partitus | Larva - head scale hairs dorsal | Merritt p. 373 fig. 18.177 |
| Allocosmoecus partitus | Larva - metanotum & ab1 dorsal | Merritt p. 373 fig. 18.179 |
| Allocosmoecus partitus | Larva - case | Merritt p. 376 fig. 18.196 |
| Allocosmoecus partitus | Larva - ab2 ventral | Merritt p. 373 fig. 18.183 |
| Allomyia scotti | Larva - head dorsal | Merritt p. 369 fig. 18.143 |
| Allomyia scotti | Larva - case | Merritt p. 370 fig. 18.157 |
| Alloperla | Larva - pronutum | Merritt p. 233 fig. 14.70 |
| Alloperla imbecilla | Larva - head | Merritt p. 233 fig. 14.66 |
| Alloperla imbecilla | Larva - nymph | Schwiebert p. 54b fig. 5 |
| Alloperla imbecilla | Larva - right cercus lateral | Merritt p. 233 fig. 14.74a |
| Ambrysus | Imago - head & thorax ventral | Merritt p. 283 fig. 15.102 |
| Ambrysus californicus (Ambrysus bohartorum) | Imago - adult | McCafferty p. 177 fig. 10.09 |
| Ambrysus mormon | Imago - dorsal view | Merritt p. 285 fig. 15.104 |
| Ameletus | Larva - nymph | Knopp p. 174 Plate 1a |
| Ameletus | Larva - western nymph | Caucci p. 256+ CP XXIII f |
| Ameletus | Larva - nymph | Knopp p. 093 |
| Ameletus | Larva - nymph | Arbona p. 110 fig. 10-2 |
| Ameletus | Larva - gill | Knopp p. 093 |
| Ameletus | Larva - gill | Caucci p. 284 |
| Ameletus | Imago - hindwing vein M fork | McClane p. 606 |
| Ameletus | Imago - hind wing | Caucci p. 284 |
| Ameletus | Larva - gill 4 | Merritt p. 134 fig. 11.34 |
| Ameletus | Larva - gill 4 | Merritt p. 134 fig. 11.33 |
| Ameletus | Larva - gill | Bouchard p. 54 fig. 4.30a |
| Ameletus | Subimago - dun | Knopp p. 174 Plate 2a |
| Ameletus | Larva - anterior head dorsal | Merritt p. 137 fig. 11.40 |
| Ameletus | Imago - tarsal claw | Merritt p. 151 fig. 11.127 |
| Ameletus | Imago - hind wing | Knopp p. 094 |
| Ameletus browni | Imago - male genitalia | Needham p. 457 a |
| Ameletus celer | Imago - male genitalia | Needham p. 450 f |
| Ameletus celer (Ameletus alticolus) | Imago - male genitalia | Needham p. 450 d |
| Ameletus celer (Ameletus celeroides) | Imago - male genitalia | Needham p. 450 e |
| Ameletus cooki | Imago - male genitalia | Needham p. 450 b |
| Ameletus dissitus | Imago - male genitalia | Needham p. 457 d |
| Ameletus lineatus | Imago - fore wing | McCafferty p. 101 fig. 07.07 |
| Ameletus lineatus | Imago - hind wing | McCafferty p. 101 fig. 07.08 |
| Ameletus lineatus | Larva - abdomen | Arbona p. 155 fig. 42 |
| Ameletus lineatus | Larva - larva | McCafferty p. 101 fig. 07.06 |
| Ameletus ludens | Imago - male genitalia | Needham p. 450 a |
| Ameletus ludens | Larva - abdomen | Arbona p. 155 fig. 42 |
| Ameletus oregonensis | Imago - male genitalia | Needham p. 455 a |
| Ameletus shepherdi | Imago - male genitalia | Needham p. 455 b |
| Ameletus similior | Imago - male genitalia | Needham p. 455 e |
| Ameletus sparsatus | Larva - abdomen | Arbona p. 155 fig. 43 |
| Ameletus sparsatus | Imago - male genitalia | Needham p. 457 b |
| Ameletus sparsatus (Ameletus aequivocus) | Imago - male genitalia | Needham p. 457 c |
| Ameletus subnotatus | Imago - hind wing | Needham p. 121 A |
| Ameletus subnotatus | Imago - male genitalia | Needham p. 455 c |
| Ameletus vancouverensis | Imago - male genitalia | Needham p. 457 e |
| Ameletus velox | Imago - male genitalia | Needham p. 450 c |
| Ameletus velox | Larva - abdomen | Arbona p. 155 fig. 44 |
| Ameletus vernalis | Imago - male genitalia | Needham p. 455 d |
| Ametor | Larva - clypeus | Merritt p. 430 fig. 20.123 |
| Ametor | Larva - head ventral | Merritt p. 430 fig. 20.122 |
| Ametropus | Larva - fore leg | Merritt p. 133 fig. 11.24a |
| Ametropus | Larva - hind leg | Merritt p. 133 fig. 11.24b |
| Ametropus fragilis | Imago - fore & hind wing | Needham p. 430 |
| Amiocentrus | Larva - case | Pobst - p. 35-c |
| Amiocentrus | Imago - lateral view | LaFontaine p. 220 - b |
| Amiocentrus | Larva - case | LaFontaine p. 220 - a |
| Amiocentrus aspilus | Larva - head ventral | Merritt p. 352 fig. 18.7 |
| Amiocentrus aspilus | Larva - mesonotum dorsal | Merritt p. 353 fig. 18.15 |
| Amiocentrus aspilus | Larva - pronotum lateral view | Merritt p. 353 fig. 18.12 |
| Amiocentrus aspilus (Amiocentrus aspilis) | Adult - lateral | Pobst - p. 34-b |
| Amphiagrion | Larva - head dorsal | Bouchard p. 67 fig. 5.10 |
| Amphicosmoecus canax | Larva - case | Merritt p. 370 fig. 18.164 |
| Amphicosmoecus canax | Larva - metanotum dorsal view | Merritt p. 373 fig. 18.178 |
| Amphinemura banksi | Larva - cervical gills ventral | Merritt p. 226 fig. 14.20 |
| Amphinemura nigritta | Larva - larva | McCafferty p. CP VII fig. 037 |
| Amphinemurinae | Larva - cervical gill | McCafferty p. 154 fig. 09.04 |
| Amphinemurinae | Larva - abodmen ventral tip | McCafferty p. 154 fig. 09.05 |
| Amphizoa | Larva - metathoracic leg | Merritt p. 404 fig. 20.004 |
| Amphizoa | Larva - head ventral | Merritt p. 404 fig. 20.003 |
| Amphizoa | Larva - dorsal view | Merritt p. 404 fig. 20.002 |
| Amphizoa | Imago - dorsal view | Merritt p. 407 fig. 20.030 |
| Amphizoa insolens | Imago - adult | McCafferty p. 212 fig. 13.03 |
| Amphizoa insolens | Larva - larva | McCafferty p. 212 fig. 13.04 |
| Ampumixis | Imago - pronotum | Merritt p. 454 fig. 20.281 |
| Ampumixis | Larva - abdominal segment lateral | Merritt p. 451 fig. 20.250 |
| Ampumixis | Larva - prothorax ventral | Merritt p. 451 fig. 20.251 |
| Anabolia bimaculata | Larva - case | Merritt p. 376 fig. 18.199 |
| Anabolia bimaculata | Larva - head & thorax dorsal | Merritt p. 375 fig. 18.193 |
| Anacaena | Larva - clypeus | Merritt p. 430 fig. 20.119 |
| Anacaena | Larva - right mandible dorsal | Merritt p. 430 fig. 20.118 |
| Anacaena | Imago - mesosternum | Merritt p. 437 fig. 20.162 |
| Anacroneuria | Larva - head | Merritt p. 232 fig. 14.63 |
| Analetris | Larva - gill 4 | Merritt p. 134 fig. 11.36 |
| Anax junius | Larva - nymph | Schwiebert p.150a-3 |
| Anax junius | Larva - larva | McCafferty p. CP VI fig. 033 |
| Anax junius | Imago - adult male | McCafferty p. CP VI fig. 032 |
| Anax junius | Larva - dorsal view | Bouchard p. 71 fig. 5.23 |
| Anchycteis (Anchyteis) | Imago - dorsal view | Merritt p. 445 fig. 20.215 |
| Anchycteis (Anchyteis) | Imago - head frontal view | Merritt p. 445 fig. 20.217 |
| Anchycteis (Anchyteis) | Imago - male & female antennae | Merritt p. 445 fig. 20.216 |
| Anchytarsus | Larva - abdomen posterior | McCafferty p. 227 fig. 13.45 |
| Anchytarsus (Anchydarsus) | Larva - 9th abdominal segment | Merritt p. 445 fig. 20.214 |
| Ancyronyx | Imago - dorsal view | Merritt p. 453 fig. 20.270 |
| Ancyronyx | Imago - hind coxa | Merritt p. 453 fig. 20.269 |
| Ancyronyx | Larva - dorsal view | Merritt p. 449 fig. 20.240 |
| Ancyronyx | Larva - ventral view | Merritt p. 449 fig. 20.239 |
| Anepeorus (Anepeorinae) | Larva - head | McCafferty p. 109 fig. 07.29 |
| Anepeorus (Anepeorinae) | Larva - gill 3 | McCafferty p. 109 fig. 07.30 |
| Anepeorus (Spinadinae) | Larva - head | McCafferty p. 109 fig. 07.31 |
| Anepeorus (Spinadinae) | Larva - gill 3 | McCafferty p. 109 fig. 07.32 |
| Anepeorus rusticus | Imago - male genitalia | Needham p. 425 a |
| Anisocentropus | Larva - head & thorax dorsal | Merritt p. 324 fig. 17.65 |
| Anisocentropus | Larva - retreat | Merritt p. 311 fig. 17.17 |
| Anisocentropus pyraloides | Larva - gill | Merritt p. 354 fig. 18.24 |
| Anisocentropus pyraloides | Larva - pronotum dorsal view | Merritt p. 354 fig. 18.21 |
| Anodocheilus | Imago - head, pronotum, elytra bases | Merritt p. 424 fig. 20.086 |
| Anophelinae | Larva - abdomen posterior | McCafferty p. 306 fig. 16.39 |
| Anoplius depressipes | Imago - adult | McCafferty p. 378 fig. 20.06 |
| Anthicus | Larva - cranium dorsal | Merritt p. 406 fig. 20.020 |
| Anthopotamus | Larva - head & fore leg dorsal | Merritt p. 131 fig. 11.07 |
| Anthopotamus | Larva - nymph | Knopp p. 130 |
| Anthopotamus | Subimago - male lateral view | Fauceglia p. 174 |
| Anthopotamus | Larva - head & prothorax dorsal | Bouchard p. 50 fig. 4.6 |
| Anthopotamus | Imago - male lateral view | Fauceglia p. 175 |
| Anthopotamus | Imago - female lateral view | Fauceglia p. 175 |
| Anthopotamus | Subimago - female lateral view | Fauceglia p. 174 |
| Anthopotamus (Potamanthus) | Imago - fore wing | McCafferty p. 113 fig. 07.43 |
| Anthopotamus (Potamanthus) | Larva - larva | McCafferty p. 113 fig. 07.42 |
| Anthopotamus (Potamanthus) | Larva - nymph | Arbona p. 101 fig. 9-4 |
| Anthopotamus (Potomanthus) | Imago - forewing vein A1 | McClane p. 603 |
| Anthopotamus (Potamanthus) | Larva - dorsal view | Bouchard p. 61 fig. 4.52 |
| Anthopotamus (Potamanthus) | Larva - nymph | Swisher p. 171 |
| Anthopotamus distinctus | Larva - dorsal view | Fauceglia p. 173 |
| Anthopotamus distinctus | Larva - lateral | Ames - p. 114 |
| Anthopotamus distinctus | Subimago - lateral | Ames - p. 116 |
| Anthopotamus distinctus (Potamanthus distinctis) | Subimago - male dun | Caucci p. 256+ CP XVII d |
| Anthopotamus distinctus (Potamanthus distinctis) | Subimago - female dun | Caucci p. 256+ CP XVII a |
| Anthopotamus distinctus (Potamanthus distinctis) | Imago - female spinner | Caucci p. 256+ CP XVII c |
| Anthopotamus distinctus (Potamanthus distinctus) | Larva - nymph | Schwiebert p.182b-5 |
| Anthopotamus distinctus (Potamanthus distinctus) | Larva - nymph | Caucci p. 256+ CP XV c |
| Anthopotamus distinctus (Potomanthus distinctus) | Larva - abdomen | Arbona p. 159 fig. 73 |
| Anthopotamus myops | Larva - gill | Knopp p. 130 |
| Anthopotamus myops (Potamanthus myops) | Imago - genitalia | Arbona p. 175 fig. 38 |
| Anthopotamus myops (Potamanthus rufous) | Larva - larva | McCafferty p. CP III fig. 012 |
| Anthopotamus myops (Potamanthus rufus) | Egg | Needham p. 68 fig. 4 |
| Anthopotamus myops (Potamanthus rufus) | Larva - nymph | Schwiebert p.182b-4 |
| Anthopotamus myops (Potomanthus myops) | Larva - abdomen | Arbona p. 159 fig. 72 |
| Anthropleidae | Larva - gill 4 | McCafferty p. 109 fig. 07.26 |
| Anthropleidae | Larva - head | McCafferty p. 109 fig. 07.25 |
| Antocha | Pupa - pupa | Schwiebert p.103-5 |
| Antocha | Larva - larva | McCafferty p. 296 fig. 16.09 |
| Antocha | Larva - larva | Schwiebert p.104-1 |
| Apatania | Larva - thorax dorsal | McCafferty p. 263 fig. 14.69 |
| Apatania | Larva - case | Merritt p. 370 fig. 18.153 |
| Apatania | Imago - lateral view | LaFontaine p. 282 - b |
| Apatania | Larva - case | LaFontaine p. 282 - a |
| Apatania arizona | Larva - case | McCafferty p. 262 fig. 14.62 |
| Apatania arizona | Larva - metanotum dorsal | Merritt p. 367 fig. 18.135 |
| Aphididae | Imago - adult | McCafferty p. 365 fig. 18.05 |
| Apobaetis | Larva - tarsus & claw | Merritt p. 137 fig. 11.45 |
| Apobaetis etowah (Pseudocloeon etowah) | Imago - male genitalia | Needham p. 725 i |
| Apteraliplus | Imago - prosternum | Merritt p. 416 fig. 20.061 |
| Aquarius | Imago - abdominal terminalia lateral | Merritt p. 291 fig. 15.151 |
| Aquarius | Imago - antenna | Merritt p. 280 fig. 15.71 |
| Aquarius | Imago - head & thorax dorsal | Merritt p. 281 fig. 15.75 |
| Aquarius remigis | Imago - dorsal view | Merritt p. 281 fig. 15.79 |
| Aquarius remigis | Imago - dorsal view | Bouchard p. 98 fig. 7.34 |
| Arctocorisa | Imago - left hemelytron | Merritt p. 279 fig. 15.55 |
| Arctocorisa chanceae | Imago - male foreleg | Merritt p. 277 fig. 15.48 |
| Arctocorisa sutilis | Imago - male foreleg | Merritt p. 277 fig. 15.47 |
| Arctocoriza alternata (Arctocorixa alternata) | Imago - adult | Schwiebert p. 117 |
| Arctopora | Larva - metanotum dorsal | Merritt p. 375 fig. 18.188 |
| Arctopora | Larva - retreat | Merritt p. 311 fig. 17.08 |
| Arctopsyche | Imago - lateral view | LaFontaine p. 232 - b |
| Arctopsyche | Larva - case | LaFontaine p. 232 - a |
| Arctopsyche | Larva - lateral | Pobst - p. 46-b |
| Arctopsyche grandis | Adult - lateral | Pobst - p. 46-a |
| Arctopsyche grandis | Larva - catchnet | McCafferty p. 250 fig. 14.15 |
| Arctopsyche grandis (Hydropsyche grandis) | Larva - larva | Schwiebert p. 118a-7 |
| Arctopsyche irrorata | Larva - ab4 left lateral view | Merritt p. 357 fig. 18.54 |
| Arctopsyche irrorata | Larva - head ventral | Merritt p. 357 fig. 18.41 |
| Arctopsychinae | Larva - abdomen lateral | McCafferty p. 251 fig. 14.20 |
| Argia | Larva - caudal lamellae | McCafferty p. 135 fig. 08.13 |
| Argia extranea | Larva - apex of abdomen dorsal | Bouchard p. 43 fig. 3.30 |
| Argia extranea | Larva - dorsal view | Bouchard p. 42 fig. 3.22 |
| Argia extranea (Argia extranet) | Larva - abdomen apex & lamellae | Bouchard p. 67 fig. 5.07 |
| Argia fumipennis violacea (Argia violacea) | Larva - nymph | Schwiebert p.150b-7 |
| Argia vivida | Imago - adult male | McCafferty p. CP V fig. 029 |
| Argia vivida | Larva - larva | McCafferty p. CP V fig. 028 |
| Arrenuroidea | Larva - larva dorsal | McCafferty p. 399 fig. 23.04 |
| Artemia | Imago - adult | McCafferty p. 391 fig. 22.05 |
| Arthroplea | Imago - hindwing vein R4+R5 | McClane p. 608 |
| Arthroplea | Larva - head dorsal | Merritt p. 137 fig. 11.52 |
| Arthroplea bipunctata | Imago - male genitalia | Needham p. 425 c |
| Arthroplea bipunctata | Imago - male genitalia | Needham p. 425 d |
| Asellus | Imago - adult | McCafferty p. 388 fig. 22.01 |
| Asellus (Aselius) | Ametabolous - dorsal view | Bouchard p. 19 fig. 2.46 |
| Asellus (Aselius) | Ametabolous - cephalothorax dorsal | Bouchard p. 21 fig. 2.56 |
| Asioplax texana (Tricorythodes texanus) | Larva - nymph | Schwiebert p.182b-8 |
| Astacidae | Imago - adult | McCafferty p. 390 fig. 22.03 |
| Asynarchus | Larva - mesonutum dorsal view | Merritt p. 373 fig. 18.175 |
| Athericidae | Larva - lateral view | Bouchard p. 170 fig. 13.51 |
| Atherix | Larva - larva | Schwiebert p.104-3 |
| Atherix pachypus | Larva - larva | McCafferty p. CP XVI fig. 117 |
| Atherix variegata | Larva - larva | McCafferty p. 318 fig. 16.70 |
| Atopsyche | Imago - head, pro & mesonotum dorsal | Merritt p. 334 fig. 17.120 |
| Atopsyche | Imago - maxillary palp | Merritt p. 334 fig. 17.121 |
| Atopsyche | Larva - foreleg lateral | Merritt p. 321 fig. 17.50 |
| Atopsyche | Pupa - abdomen dorsal | Merritt p. 330 fig. 17.90 |
| Atopsyche | Pupa - head frontal | Merritt p. 330 fig. 17.91 |
| Atractelmis | Imago - pronotum | Merritt p. 454 fig. 20.280 |
| Atrichopogon | Larva - lateral view | Bouchard p. 165 fig. 13.24 |
| Attaneuria ruralis | Larva - pronotum | Merritt p. 232 fig. 14.58 |
| Attaneuria ruralis (Acroneuria ruralis) | Larva - nymph | Schwiebert p. 54b fig. 3 |
| Attenella | Imago - female lateral view | Fauceglia p. 69 |
| Attenella | Imago - male lateral view | Fauceglia p. 68 |
| Attenella | Larva - dorsal view | Fauceglia p. 65 |
| Attenella | Subimago - female lateral view | Fauceglia p. 67 |
| Attenella | Subimago - male lateral view | Fauceglia p. 66 |
| Attenella attenuata | Imago - male genitalia | Berner - p. 68 fig. 69 |
| Attenella attenuata | Larva - abdomen | Arbona p. 160 fig. 108 |
| Attenella attenuata | Larva - abdomen | Knopp p. 244 |
| Attenella attenuata | Larva - dorsal, mature | Berner - p. 80 fig. 158 |
| Attenella attenuata | Larva - nymph | Knopp p. 244 |
| Attenella attenuata (Ephemerella attenuata) | Larva - nymph | Schwiebert p.214b-9 |
| Attenella attenuata (Ephemerella attenuata) | Subimago - male dun | Caucci p. 256+ CP II e |
| Attenella attenuata (Ephemerella attenuata) | Imago - male genitalia | Needham p. 621 c |
| Attenella attenuata (Ephemerella attenuata) | Imago - genitalia | Arbona p. 175 fig. 20 |
| Attenella attenuata (Ephemerella attenuata) | Larva - nymph | Arbona p. 091 fig. 8-16 |
| Attenella margarita | Larva - abdomen | Arbona p. 160 fig. 109 |
| Attenella margarita | Larva - nymph | Knopp p. 248 |
| Attenella margarita (Ephemerella margarita) | Imago - genitalia | Arbona p. 175 fig. 31 |
| Attenella margarita (Ephemerella margarita) | Larva - nymph | Arbona p. 097 fig. 8-25 |
| Auleutes | Imago - lateral oblique view | Merritt p. 459 fig. 20.314 |