INDEX. 



693 



Populus alba (White Poplar), bio- 

 nomics of Idiocerus cognatus on, 

 in U.S.A., 82, 464. 



Populus bahatiiifera (Balm of 

 Gilead), Zeugophora nhnnrniis on, 

 in Canada, 151 . 



Populus deltoides, BupresHs con- 

 fluenta in, in U.S.x\., 295. 



Populus fyemontii, Ceria in, in 

 i California, 9. 



Populus suaveolcns, Dicranura 

 vinula on, in Russia, 105. 



Populus t roll II la, Tachvptilia 

 populella on, in (iermany, 515 ; 

 Dicranura v inula on, in Rnssia, 

 105. 



Populus tremuloidcs (Aspen Poplar), 

 pests of, in Lithuania, 420 ; pests 

 of, in Manitoba, 438 ; pests of, 

 in U.S.A., 295, 381. 



Populus virginiana, Enlecanium 

 coryli on, 124. 



porcellus, Deilephila ; Euscepes. 



Porina servinata, parasitised by 

 Lissopiinpla seniipuiictata in New 

 Zealand, 63. 



Porococcus tinctorius, 259. 



porosa, Gcloptera. 



Porosagrotis orthogonia (Pale 

 Western Cutworm), on cereals, 

 etc., in Canada, 192. 



Porthesia si mil is (see Arctornis 

 chrysorrhoea) . 



Porthetria {Lyinaniria) dispar 

 (Gipsy Moth), establishment of 

 Compsilura concinuata against, in 

 Canada, 3 ; experiments with 

 h^'drocyanic-acid gas again.st, in 

 Germany, 426 ; natural enemies 

 and control of, in forests in 

 Holland, 424 ; on pear in Italy, 

 142 ; measures against, in Russia, 

 102, 105 ; on oak in Spain, 367 ; 

 food-plants of, in Switzerland, 

 201 ; bionomics and control of, 

 in U.S.A., 23, 96, 220, 293, 315, 

 341,529; intercepted on imported 

 nursery stock in U.S.A., 306 ; 

 effect of wind on spread of, 502 ; 

 Cronartium ribicola spread bv, 4 ; 

 immunity reaction to bacilli in, 

 36. 



Porthetria monacha (see Liparis). 



Porto Rico, notice of bibliography of 

 sugar pests of, 483 ; risk of 

 introducing Calisto archebates with 

 seed sugar-cane into, 248 ; notes 

 on cotton pests in, 303 ; miscel- 

 laneous pests in, 71, 446; 

 measures against Stratcgus 

 quadrifoi'eatus on coconut in, 451 ; 

 pests of sugar-cane in, 446, 483 ; 



value of lizards in destroying 

 noxious insects in, 483 ; pests 

 from, intercepted in U.S.A., 307, 

 383. 



Porto Rico ]\Iole-cricket (see 

 Scapterisciis vicinus) . 



portoriccnsis, Laclnwstrrna (Pliyl- 

 lophaga). 



Portugal, vine pests in, 494 ; pests 

 from, intercepted in Oueensland, 

 157. 



Poriulaca (see Purslane). 



Poriulaca oleracea, food-plant of 

 Holotrichia leucophthalnia and 

 Tetranychus telarius in Dulcli 

 East Indies, 140, 454. 



postica, Hyper a (see H . variabilis) ; 

 Orgyia . 



posticus, Phytonoinus (sec Hvpcra 

 Tariabilis) . 



postreuia, Laclmostc'rua . 



Potash, experiments with, against 

 Helopeltis theivora, 205. 



Potash Soap, against Clysia 

 ambiguella, 543. 



Potash-phosphoric Acid, effect of 

 proportion of, in soil, on Helo- 

 peltis theivora, 205. 



Potassium Cyanide, against ants, 

 131, 240 ; in preparation of 

 hydrocyanic-acid gas, 65. 



Potassium Ferricj^anide, experi- 

 ments with, against termites, 40. 



Potassium Ferrocyanidc, experi- 

 ments with, against termites, 40. 



Potassium Hvdroxide, effect of, 

 on solutions of pyretlirum, 362. 



Potassium Sulphide, 444. 



Potassium Sulpho - carbonate, 



against underground pests, 221. 

 369. 



Potato [Solanuiii tuberosum), La- 

 phygma cxempta on, in South 

 Africa, 412 ; little damaged by 

 Lema trilincata in South Africa, 

 412 ; pests of, in Australia, 155, 

 157, 207 ; pests of, in Austria, 

 426 ; measures against pests of, 

 in Brazil, 325 ; pests of in Britain, 

 138, 155, 351, 474, 514, 517; 

 pests intercepted on, in California, 

 13, 49, 114, 182, 388, 509; pe.sts 

 of, in Canada, 2, 324, 373, 422 ; 

 pests of, in Ceylon, 521 ; legisla- 

 tion respecting, in Cuba, 256 ; 

 measures against Phthorimaea 

 operculella on, in Cyprus, 204 ; 

 pests of, in h'rance, 40. 121, 

 489 ; pests of, in Germany, 270, 

 286, 346, 358, 429, 466, 467, 468 ; 

 pests of, in Hawaii, 136, 409 ; 

 pests of, in India, 64, 409 ; 



