420 



could be collected by banding the trees in July, showing that they 

 retire to their hibernating quarters early in the season. The investiga- 

 tions on Taeniothrips inconsequens, Uzel, were continued, the English 

 " XL All " insecticide paste being very effective against this thrips. 



ScHoYEN (T. H.). Kornsygdome paa Hedemarken. [The Diseases of 

 Barley in Hedemarken, Norway.] — Tidens Tegn, Christiania, 

 1918," nos. 232, 235,269. 



The devastation of the barley fields recorded from Hedemarken 

 in 1917 continued and increased in 1918. About 75 per cent, of the 

 injury was caused by Oscinella (Oscmis) frit. Late sowing of spring 

 barley has been found an advantage, and the author recommends the 

 sowing of trap-crops in strips in order to collect the larvae of the 

 second generation. 



Boas (J. E. V.). Aedelgranslusene. [The Aphids of the Silver Fir.] 

 — Dansk Skovforenings Tidskrift, Cajpenhagen, iii, 1918, pp. 191- 

 276, 51 figs. 



This paper deals with Chermes piceae and Mindarus abielitius, with 

 special regard to the injuries caused by them. Regarding C. piceae 

 the author is of opinion, contrary to Borner, Marchal and Niisslin, 

 that C. piceae and C. nusslini are not distinct, but only biological 

 races of the same species. 



In Denmark C. piceae is to a great extent an enemy of young silver 

 fir trees, killing them or impairing their vitality. In many instances 

 it only kills the terminal shoots, thus reducing the quality of the 

 timber. Its attacks frequently diminish gradually, the insect becoming 

 scarcer from year to year ; but in localities where the soil is not 

 favourable to the cultivation of the silver fir, the attacks may continue 

 to such an extent that the plantations suffer seriously. 



Mindarus abietinus does not affect the general health of the trees 

 to the same extent as G. piceae, confining its attacks chiefly to the 

 terminal shoots, which break off. This injury occurs on old as well 

 as on young trees and is often repeated, causing the trees to bend 

 and reducing the value of the timber. 



As remedial measures spraying with lysol solution or quassia and 

 thorough thinning of the plantations are suggested. 



Ljungdahl (D.). Lepidopterologiska Anteckningar. [Notes on 

 Lepidoptera.] — Entomologisk Tidskrift, Stockholm, xxxix, no. 1, 

 1918, pp. 82-91, 4 figs. 



This paper contains the following records of Ichneumonidae and 

 Tachinid flies reared from Lepidoptera : Trogus exaltatorius, Panz., 

 from the pupa of Dendrolimus pini, L. ; Ichneumon extensorius, L., 

 from pupae of Polia {Mamestra) advena, Schiff. ; Bucentes cristata, F., 

 from the larvae of Polia suasa, Schiff. {Mamestra dissimilis, Knoch), 

 and Exorista vulgaris, Fall., from cocoons of the same species ; 

 Banchus volutatorius, L., and Exetasfes cinctipes, Retz., from the 

 pupae of Polia suasa and P. {M.) contigua, Schiff. ; Ichneumon exten- 

 sorius, L., Campoplex remotus, Frst., and Platylabus dohrosus, Wsm., 

 from Lygris testata, L. ; Microgaster calceatus, Hal., from Larentia 



