hickory tussock moth, 223 black carpenter ant, 429 
Hyperaeschra stragula, 218 bronze poplar borer, 279 
imported willow leaf beetle, 264 cottonwood borer, 289 
io moth, 208 cottonwood twig borer, 156 
Tridopsis larvaria, 192 Dicerca tenebrica, 284 
lappet moth, 206 Hexomyza schineri, 450 
large aspen tortrix, 168 hornet moth, 141 
large maple spanworm, 199 leopard moth, 145 
Macrarocampa marthesia, 222 linden borer, 297 
maple webworm, 180 Micracis swainei, 366 
mourningcloak butterfly, 174 oak timberworm, 318 
Nematus fulvicrus, 406 Oberea schaumii, 300 
hudsoniimagnus, 406 Platypus compositus, 376 
limbatus, 406 Poecilonota cyanipes, 285 
salicisodoratus, 405 poplar borer, 295 
Nevada buck moth, 208 poplar carpenterworm, 146 
notched-wing geometer, 196 poplar clearwing moth, 141 
Notodonta simplaria, 223 poplar vagabond aphid, 80 
obliquebanded leafroller, 168 poplar-and-willow borer, 334 
oriental moth, 177 poplar-butt borer, 311 
pepper-and-salt moth, 200 poplar-gall saperda, 298 
Pero morrisonaria, 197 Saperda moesta, 298 
Phyllonorycter salicifoliella, 130 sapwood timberworm, 248 
Plagodis serinaria, 195 tarnished plant bug, 66 
Polydrusus impressifrons, 321 Trypodendron retusum, 371 
poplar dagger moth, 236 twig girdler, 301 
poplar leafmining sawfly, 401 Xylotrechus annosus annosus, 312 
poplar petiole gall aphid, 80 buds, shoots, roots— 
poplar petiole gall moth, 125 Agrilus horni, 279 
poplar sawfly, 406 broadnecked root borer, 309 
poplar tentmaker, 215 cottonwood borer, 289 
Protoboarmia porcelaria indicataria, Eriophyes parapopuli, 31 
200 hornet moth, 141 
Pseudexentera oregonana, 160 poplar clearwing moth, 141 
Pseudosciaphila duplex, 160 poplar-butt borer, 311 
Psilocorsis reflexella, 132 sucking insects— 
purplish-brown looper, 199 azalea bark scale, 103 
red spotted purple, 175 black willow aphid, 79 
redhumped caterpillar, 222 black willow scale, 111 
saddleback looper, 192 Chaitophorus populicola, 79 
satin moth, 233 stevensis, 79 
Schizura ipomoeae, 223 Comstock mealybug, 93 
leptinoides, 223 Corythucha elegans, 65 
smeared dagger moth, 236 cottony maple scale, 97 
Sparganothis reticulatana, 161 dentate scale, 123 
Sphinx luscitiosa, 214 Idiocerus spp., 70 
spiny-elm caterpillar, 174 Macropsis spp., 70 
spotted tussock moth, 224 oystershell scale, 114 
stout looper, 195 Pterocomma populifoliae, 79 
tiger swallowtail, 173 Telamona decorata, 71 
Trichiosoma triangulum, 383 Tuberolachnus salignus, 79 
twinspot sphinx, 215 willow scale, 119 
twobanded Japanese weevil, 322 willow scurfy scale, 111 
unicorn caterpillar, 223 Poplar, balsam: 
velleda lappet moth. 206 Corythucha elegans, 65 
viceroy, 175 large aspen tortrix, 168 
western tent caterpillar, 204 Poplar, Lombardy: 
white admiral. 175 Japanese beetle, 271 
willow flea weevil, 334 Prickly-ash: 
willow sawfly. 405 Agonopterix nigrinotella, 132 
willow shoot sawfly, 412 Papilio cresphontes, 173 
winter moth, 189 Privet: 
yellow-marked caterpillar, 237 Archips rosanus, 161 
Zengophora scutellaris, 265 ash and privet borer, 308 
bark, wood, twigs— Asterolecanium arabidis, 106 
Agrilus horni, 279 lilac borer, 143 
American plum borer, 186 lilac leafminer, 131 
aspen carpenterworm, 146 white prunicola scale, 118 
568 
