Index 



461 



Pisidium — Continued. 



crystalense, 351, 352, 364, 374, 404, 



415. 

 spp., 351, 353, 364. 

 variabile (lacustrine), 544. 

 Plagiola donaciformis, 385, 416, 419. 

 elegans, 3S5, 421. 

 securis, 385. 

 Planarians, 380, 401, 405, 417. 



lacustrine, 544. 

 Plankton, 334, 424, 425. 

 Planorbidae, 419, 420. 

 Planorbis exacutus,- 420. 

 (lacustrine), 544. 

 parvus, 419, 420. 

 trlvolvis, 420. 

 Plasmodiophora brassicae, 251. 

 Plasmopara viticola, 229. 

 Plathemis lydia, 382 (see Errata), 444, 



445, 446, 454, 456. 

 Plecoptera, 442, 448. 450, 451, 452, 456. 



naiades, 459. 

 Plectodiscella veneta, 231. 

 Pleurocera elevatum, 377. 



lewisii, 364, 376, 377, 381, 416, 419. 

 subulare, 381. 

 Pleuroceridae, 374, 375, 403, 416, 419, 



421. 

 Pleurotropis sp., 16. 

 Plum, 224. 

 American, 226. 

 De Soto, 226. 



diseases, 224-226, 278, 307, 308. 

 Japanese var.'s, 226. 

 Wild Goose, 225, 226. 

 Pluniatella polymorphs repens, 417. 

 princeps fruticosa, 376, 377, 380, 



402. 417. 

 princeps mucosa spongiosa, 417. 

 princeps, var.'s, 402. 

 Podosphaera leucotricha, 212. 



oxyacanthae, 218, 226. 

 Polycentropus sp., 417, 421. 

 Polymitarcys albus, 448, 449, 451. 



sp., 456. 

 Polyodon, .';43. 

 Polythrincium trifolil, 205. 



Poplar, Carolina, 112, 116. 



Yellow, 61, 92, 119. 

 Porifera, 416, 419, 420. 

 Potamogeton, 339, 354, 366, 542. 

 Potato, 239. 



diseases, 239-241, 278, 316. 



distribution of acreage, 315. 



Irish Cobber, 241. 



Sweet, 243. 



diseases, 243-244, 278, 318. 

 distribution o£ acreage, 317. 

 Nancy Hall var., 244. 

 Procladius concinnus, 422, 458. 



spp., 349, 362, 415, 446, 447, 453, 454. 

 Prodiamesa ichthyobrota, 459. 

 Prosopistoma foliaceum, 458. 

 Protophytes, 538. 



Protozoa as food of crustaceans, 548. 

 of Entomostraca, 538. 

 of minute insect larvae, 538. 

 Prunus serotina, 228. 



virginiana. 15. 

 Psectrotanypus brevicalcar, 459. 

 Psephenus herricki, 458. 



lecontei, 458. 

 Pseudomonas campestris, 251. 



dissolvens, 197. 



lachrymans, 249. 



phaseoli, 253. 



pruni, 221, 223, 226, 228. 



stewarti, 198. 



translucens, 190. 



tumefaciens, 213, 234. 

 Pseudoperonospora cubensis, 249. 

 Pseudopeziza medicaginis, 203. 



ribis, 235. 

 Psychoda alternata, 441, 442. 



phalaenoidos, 441. 



sexpunctata, 441. 



sp., 421. 

 Psychodidae, 458. 

 Pteronarcys, 456. 



dorsata, 452. 

 Ptychoptera, 459. 



contaminata, 441, 459. 

 Ptychopterldae, 459. 



