90 



This practice is also recommended for Cnethocampa pityocampa, 

 Scidff., the yomig larvae being found dead in their nests after the 

 trees have been sprayed. The theory advanced in 1914 was confirmed 

 during these observations, that pines infested by Dioryctria spp. 

 were those that had previously been attacked by the fungus Peridermium 

 pini corticola, or that grew by the roadside and had damaged branches, 

 in the axils of which the larvae were found, as well as in tumours 

 produced by Bacillus pini. Damage caused by Dioryctria spp. is 

 generally found in the trunks of young pines or in the branches of older 

 trees, at various heights. Control of these moths has been attempted 

 by scraping away the resinous excrescences to expose the galleries 

 and then treating them with coal-tar. They generally attack isolated 

 pines, rather than those growing thickly together. Their life-cycle 

 requires investigation. Caterpillars of various sizes have been 

 found at the end of July, and it seems probable that adults appear not 

 only in June and September but also during the intervening months 

 and sometimes in May and October, a second hibernation also being 

 possible. 



Among other injurious insects studied during the year are the 

 Coieo'pteYa, Brachyderes suluralis, Gr., on pines; Ch(dcophoramariana,L., 

 on evergreen pines; Galeruca calmarieiisis, L., on elms; Hylastes 

 ater, Er., and Myelophihis piniperd-a, L., in pines ; Melasoma (Lina) 

 populi, L., on Canadian poplar ; PhyUodecta (Phralora) vitellinae, L., 

 on poplars ; and Pogonochaerus fascicuhris, Panz., on branches of 

 silver pine. Hymenopterous pests included Lopliyrus ruj'us, Ratz., 

 on evergreen pines, and Sirex juvencus, L., in black pine. Lepidoptera 

 included Nygmia phaeorrhoea {Euproctis chrysorrhoea), on elms; 

 Rhyacionia (Tortrix) huoliana, SchiS., and R. (T.) duplana, Hbn., 

 on pines ; and T. viridana, L., on oaks. R. huoliana is of common 

 occurrence in Spain as compared with R. duplana ; the former appears 

 in June and July and hibernates as a larva, the latter appears in 

 March and hibernates in the pupal stage. The Aphid, Eriosoma 

 (Schizoneura) lanugitiosum, Hausm., was observed on elms in Granada. 



Nouveaux Renseignements sur I'Habitat du Lecanium persicae, F. 

 (Coccidae). [New Information about the Habitat of Lecanium 

 persicae.] — Bull. Soc. Entom. France, Paris. 1918, no. 15, 

 9th October 1918, p. 207. 



'I'he new food- plants of Eulecanium [Lecanium) persicae here recorded 

 are :— Euonymus japonicus, E. pulchellus, Ampelopsis sp. and Wistaria 

 sinensis. 



Feytaud (J.). Eudemis et Cochylis. Recherches sur les Pieges- 

 appSits. [Polychrosis botrana and Clysia amhiguella. Experiments 

 with Bait-traps.] — Bull. Soc. Etude Vulg. Zool. Agric, Bordeaux, 

 xvii, nos. 11-12, November-December 1918, pp. 113-119, 1 fig. 



The efficiency of bait-traps fur reducing the numbers of Polychrosis 

 botrana and Clysia arnhignella depends on the time when they are 

 used. Both these moths being protandrous, it follows that at the 



