INDEX. 



727 



New South Wales, 85 ; mustard- 



oTowing as a preventive against, 



208 ; baits for, 13, 171, 364, 407 ; 



(see Agriotes, etc.) 

 Wisconsin, measures against 



Empoasca mali on potatoes in, 



510; miscellaneous pests in, 494, 



522 ; pests from, intercepted in 



California, 361, 504. 

 Wisiarin, pests inlercei>ted on, in 



California, 361, 427, 503. 

 Wistaria sinensis, food- plant v.f 



Eulecanimn persicaeiw France, 90. 

 Woburn Bordeaux Mixture, 304. 

 woglumi, Aleurocantlius. 

 Wohlfahriia brunnipalpis (Ijocust 



Fly), scarcity of, in S. Africa in 



1917-18, 245. 

 Wood- tar (see Creosote). 

 Woodpeckers, destroying insect 



pests, 159, 388. 

 Woolly Apple Aphis (see Enosoma 



lanigerum). 

 Woolly Pear Aphis (see Eriosoma 



pyricola). 

 Woolly Whitefly (see Aleiirothrixus 



howardi). 

 wrigliii, Macrotom a. 



X. 



xanthaenobares, Diorijciria. 

 xantkius, Physothrips. 

 xanthochaeta, Anastrepha. 

 Xaniliocncyrius apterus, sp. n., 



probably a parasite of Trionymus 



insularis in Hawaii, 437. 

 Xanthoencyrtus fullawayi, sp. n., 



parasite of Psciidoeoccus sacchari- 



folii in Hawaii, 437. 

 .ranthogastrello, Scirpophaqa. 

 Xantholinus cephalus, predaceous on 



Ips pini in N. America, 430. 

 xanthome laena, D iso nycli a. 

 xanthom elaenae, Tetrastichus. 

 Xanthorlioe praefectaia, (New Zea- 

 land Flax-grul)), bionomics and 



control of, in New Zealand, 49, 82. 

 xanthostigmus, Bracon. 

 Xenoborus commissuralis, on 



Fraxinvs nigra in U.S.A., 401. 

 Xenoborus neglectus. sp. n., on 



Fraxinus nigra in U.S.A., 401. 

 Xenoborus peititi, associated with 



other Capsids on Fraxinus 



americana in U.S.A., 401. 

 Xenoborus plagifer, on Fraxinus 



nigra in U.S.A., 401. 

 Xiphidium, parasitised by Centro- 



dora speciosissima in U.S.A., 362. 

 Xiphidium propinquum, predaceous 



on Tomaspis flavilatera in Br. 



Guiana, 139. 

 XL All, use of, against Taeniothrips 



inconsequens, 420. 



X-rays, use of, against Lasioderma 



serricorne, 367. 

 Xyleborus, intercepted on Wistaria 



in California, 427 ; Sporotrichum 



ghbulijerum infesting, in Cuba, 



349 ; measures against, in timber 



in Dominica, 261 ; food-plants 



of, in Dutch E. Indies, 388, 389 ; 



a possible factor in dissemination 



of mottling disease of sugar-cane 



in Porto Rico, 514. 

 Xyleborus aflinis, in rubber in 



Uganda, 260. 

 Xyleborus caiuerunus, in cacao, 



associated with Diplodia in Ugan- 

 da, 260. 

 Xyleborus roffeae, in coffee in Dutch 



E. Indies, 389 ; intercepted in 



palm seeds in Java, 488 ; in 



coffee in Tonkin, 54. 

 Xyleborus compactus, in tea in 



Ceylon, 498. 

 Xyleborus eonfusus, in rubber in 



Uganda, 260. 

 Xyleborus destruens, infesting teak 



in Java, 536. 

 Xyleborus dispar, in apple and pear 



in Italy, 157 ; in apples in 



Noiway, 540. 

 Xyleborus fornicalus (Shot-hole 



Borer of Tea), measures against, 



in Ceylon, 135,181, 196, 261, 498. 

 Xyleborus imm at urus, in avocado in 



Florida, 241. 

 Xyleborus perforans, measures 



against, in coffee, etc.. in Dutch 



Guiana, 125; in rubber in Uganda, 



260. 

 Xyleborus saxeseni (see ^Y. xylo- 



graphus). 

 Xyleborus xylographus, in apple in 



Bohemia, 499. 

 Xiflia dolabriforviis, pests of, in 



India, 291, 292. 

 Xyl'ma spp., control of, on apples 



in Nova Scotia, 313. 

 Xylinades plagiaius, food- plants of, 



in India, 291. 

 Xylococeus alni, regarded as a 



synonym of X. bctulae, 336. 

 Xjjiococcus betulae, in N. America, 



336. 

 Xylodectes ornatuy, food- plants of, 



m India, 291. 

 xylographus, Xyleborus. 

 Xyhmyges eridania (Semi-tropical 



Army Worm), measures against. 



on sweet potatoes in Florida, 418. 

 Xylomyges sunia, on chard in Porto 



Rico, 248. 

 Xylonomus propinquus, parasite of 



Hesperophanes griseus in France, 



268. 

 Xylopsocus capucinus, in Maiigifera 



indica in India, 291. 



