596 Ee INDEX 
Pied noir des céréales, 260. 
Piesma, 161, 
Piétin, 260, 262. 
du blé, 260, 262. 
Piezodorus, 178. 
_ Piezosternum, 163. 
_ Pigeons, 126. 
Pigs, 129, 130. 
Pigweed, Prostrate, 293. 
Rough, 293. 
Pike, 150, 152. 
Wall-eyed, 150, 152, 155. = 
Pine, 352, 357. 
seedlings, 81. ; 
Pinus scapulorum, 351. 
Pisces, 229, 230, 231, 234. 
Pisidium spp., 477, 478, 479, 481, 494— 
502, 504, 505, 506, 507-511, 515- 
517, 519, 520. 
Pitcher-plants and Phyllophaga, 124. 
Plaice eggs, 29, 31. 
Planaria, 440. 
Planarians, 442, 491, 499, 500, 519, 520. 
Planesticus migratorius, 125. 
Plankton, 363, 375, 418, 439, 440, 441, 
442, 443, 448-450, 454, 455, 457. 
-feeders, 440, 441, 442. 
Planorbis spp., 501, 502, 511, 513-517, 
519. 
trivolvis, 431, 479, 481, 483, 486, 511- 
514. 
Plantaginaceae, 566. 
Plantago aristata, 566. 
rugelii, 566. 
virginica, 566. 
Platycarenus, 175. 
Plea striata, 521. 
Plectana stellata, 118. 
Plethodon glutinosus, 129. 
Pleurocera, 34. 
sp., 477, 478, 480-490, 503-505, 507. 
Pleuorceridae, 375, 381, 382, 383, 384, 
385, 388, 390, 391, 396, 397, 398, 
402, 403, 404, 407, 408, 409, 414, 
435. 
Pleurococcus, 440, 443. 
Plover, Upland, 125. 
Plum, 332. 
Poa compressa, 537, 538, 560. 
pratensis, 534, 537, 538, 540, 542, 544, 
560.- 
triflora, 560. 
Podisus, 199, 219. 
crocatus, 200. 
maculiventris, 201. 
modestus, 200. 
placidus, 200. 
serieventris, 201. 
strigipes, 201. 
Podops, 171. 
cinctipes, 160. 
parvulus, 172. 
Pokeberry, 188. 
Polemoniaceae, 565. 
Polycentropus larvae, 516, 517. 
Polygala polygama, 564. 
Sanguinea, 555, 564. 
verticillata, 555, 564. 
ambigua, 564. 
Polygalaceae, 564. 
Polygonaceae, 562. 
Polygonella articulata, 562. 
Polygonum, 419. 
acre, 562. 
amphibium, 554, 562. 
exsertum, 562. 
hydropiper, 293. 
hydropiperoides, 554, 562. 
muhlenbergii, 554, 562. 
pennsylvanicum, 562. 
persicaria, 562. 
tenue, 562. 
Polydon spathula, 230, 231. 
Polypodiaceae, 559. 
Polytaenia nuttallii, 565. 
Pomoxis annularis, 27, 230, 232, 236, 
238. 
sparoides, 27, 230, 232, 236, 238. 
Pomphorhynchus, 227, 285, 237. 
bulbocolli, 230, 232, 234, 235, 237, 238, 
253. 
laevis, 233, 234, 237. 
proteus, 237. 
Pond lilies, 326. 
