September, 1942 
placida, Perlesta, 241, 271 
Plecoptera, List of the Illinois, 241 
Plecoptera, Revised classification, Zo), 
Plecoptera, Revised key to families, 238 
postica, Perla, 292, 293, 302 
projecta, Leuctra, 260 
projecta, Paraleuctra, 260 
prolonga, Acroneuria, VANE IA fs 
Protarcys, 287, 289 
bradleyi, 287, 289 
dolobrata, 287, 289 
proteus, Pteronarcys, 242, 244, 245 
Pteronarcella, 237 
Pteronarcidae, 21) 2385-239, 241.7242 
Pteronarcys, 237, 240, 241, 242 
biloba, 245 
comstocki, 245 
dorsata, 242, 244 
flavicornis, 242 
frigida, 242 
nobilis, 241, 242, 244 
Pictetii, 241, 242, 244 
proteus, 242, 244, 245 
rectus, 242 
regalis, 242, 244 
shelfordi, 242 
species, 245 
purcellana, Leuctra, 259 
pygmaea, Allocapnia, 241 209)269 
pygmaea, Capnella, 265 
pygmaea, Semblis, 265 
ramosa, Diploperla, 302 
ramosa, Perla, 302 
raynoria, Taeniopteryx, 251 
recta, Allocapnia, 241 
rectus, Pteronarcys, 242 
regalis, Pteronarcys, 242, 244 
Rhabdiopteryx, 238, 250 
richardsoni, Isoperla, 242 
rickeri, Allocapnia, 241, 267, 269 
rossi, Brachyptera, 254 
ruralis, Acroneuria, 241 
sabulosa, Acroneuria, 285, 302 
sabulosa, Perla,-285,-302 
sara, Leuctra, 241, 259 
Semblis 
fasciata, 250 
pygmaea, 265 
Setipalpia, 237 
shelfordi, Pteronarcys, 242 
Sialis dorsata, 242 
signata, Dictyopteryx, 287, 290 
signata, Isoperla, 328, 329 
signata, Perlodes, 290 
similis, Isoperla, 325 
similis, Perla, 325 
slossonae, Isoperla, 329 
slossonae, Perla, 329 
slossonae, Perlodes, 287, 289 
sorpta, Diploperla, 302 
sorpta, Perla, 302 
Strophopteryx, 238, 248, 250 
fasciata, 250 
Subulipalpia, 237, 239 
subvarians, Hydroperla, 292, 295, 296, 302 
Frison: NorrH AMERICAN PLECOPTERA 355 
subvarians, Perla, 292 
Systellognatha, 237 
Taeniopterygidae, 237, 238, 239, 241, 247, 250 
Taeniopteryx, 237, 241, 248, 250 
contorta, 253 
glacialis, 251 
kincaidi, 251 
lita, 241, 249 
maura, 241, 248, 253 
nebulosa, 248 
nivalis, 241, Mts 250.0253 
(Oemopteryx) alex, 251 
oregonensis, 251 
pacifica, 251 
pallida, 252 
parvula, 241, 249, 250 
raynoria, 251 
vanduzee, 253 
tenuis, Leuctra, 241, 256, 257, 258, 261 
tenuis, Nemoura, 258 
terna, Chloroperla, 339 
theodora, Acroneuria, 284 
tibialis, Perlodes, 287, 289 
tincta, Perla, 302 
tinctata, Diploperla, 302 
tinctata, Perla, 302 
titusi, Perla, 290 
Togoperla, 237, 2415302 
immarginata, 302 
kansensis, 241, 277, 302 
media, 241, 302 
Sp; a, 241 
tokula, Isoperla, 337 
torontonensis, Allocapnia, 265 
transmarina, Chloroperla, 316 
transmarina, Isoperla, 316 
trictura, Isoperla, 336 
trictura, Perla, 336 
trifasciata, Brachyptera, 248 
tripunctata, Chloroperla, 33 igus 3.850540 
trispinosa, Nemoura, 241, 260, 261 
truncata, Isoperla, 324, 325 
vagans, Arcynopteryx, 287, 288 
valida, Acroneuria, 273, 274 
valida, Benin 272 
vanduzee, Brachyptera, 253 
vanduzee, Taeniopteryx, 253 
varians, Hydroperla, 241, 293, 295, 2968 402 
varians, Perla, 302 
venosa, Nemoura, 241, 260, 261 
venosa, Perla, 302 
ventralis, Isoperla, 316, 334 
vernalis (?), Capnia, 240, 241, 262, 264 
verticalis, Diploperla, 302, ait 
verticalis, Perlans02 
virginiana, Allocapnia, 269 
vivipara, Allocapnia, 241, 265 
vivipara, Capnella, 265 
xanthenes, Acroneuria, 277 
xanthenes, Eccoptura, 277 
xanthenes, Berlae 277 
yosemite, Perlodes, 287, 290 
zipha, Peltoperla, 247 
