147 



Tragardii (I.). Skogsentomologiska bidrag 1-5. [Forest entomo- 

 logical contributions 1-5.] — Entomologisk Tidskrift, Stockholm, 

 nos. 3-4, December 1914, pp. 188-209, 12 figs. 



The Chalcidid, Ageniaspis fuscicollis, Dalm., was found in the larvae 

 of two needle-mining Microlepidoptera, Ocnerostoma piniariella, Zell., 

 and Dyscedestis farinatella, Dup., in the neighbourhood of Stockholm. 

 This species which has a polyembrj^onic development, described by 

 Bugnion, Marchal and Silvestri, has been previously recorded from 

 Hyponomeuta cognatellus, H. malinellus and Prays oleellus. 



In some cases, in 1913, as many as 75 per cent, of the needle-miners 

 were parasitised, and, as might have been expected, in the autumn of 

 1914 it was very difficult to find any. It is suggested that this parasite, 

 owing to its polyembryonic development and to some extent poly- 

 phagous habits, might with advantage be made use of against in- 

 jurious forms of Microlepidoptera. 



The Anthocorid, Peozostetkus cursitans, Fall., which occurs com- 

 monly in the burrows of bark-beetles in the vicinity of Stockholm was 

 found by the author to feed on their larvae. 



The larva of the Dolichopid, Medeterus signaticornis, Lw., which 

 occurred in the same localities and was found regularly with the bark- 

 beetles also feeds on the larvae and pupae, and as it is a common insect, 

 its importance may hitherto have been underestimated. Agromyzid 

 cambium-miners in birch trees have not been previously recorded 

 from Sweden, whereas in Germany, Denmark and the U.S.A. they have 

 occurred repeatedly. They were observed last summer in Bjurf ors, . 

 where young birch trees were attacked to such an extent that the timber 

 was useless for other purposes than fuel. The larva of an Agrilus, 

 believed to be that of A. betuleti, F., was found in the cambium of a 

 birch tree under circumstances which render it very probable that it 

 causes marks in the wood similar to those produced by the larvae of 

 Agromyza. 



Vassilikv (E. M.). BniflHie meeflCKoii MyiuKM Ha pocTi. h ypomai* 

 flpOBblXIa SJiaKOBlt. [The influence of Oscinis frit, L., on the growth 

 and yield of summer-sown cereals.] (From the Experimental 

 Entomological Station of the All-Russian Society of Sugar- Refiners 

 in Smiela, govt, of Kiev.) Reprint from « HDHiHO-PycCKafl 

 CenbCK0-X03flMCTBeHHafl Taaeia.* [South- Russian Agricultural 

 Gazette], Charkov, 1914, 17 pp. 



Observations on Oscinis frit conducted in 1911 in the government 

 of Petrograd are described, the object of which was to prove that 

 the application of mineral manure practically nulhfies the damage 

 by this pest. The deductions are based on observations on the effects 

 of Chlorops taeniopus, Meig., on barley, of Cecidomyia destructor. Say, 

 on rye, and of Oscinis frit on oats. Barley injured by Chlorops 

 taeniopus produced no grain at all on plots without manure, but on 

 plots manured with phosphates, the plants were able to produce 

 normal-sized grain, although the yield was less. The effect on rye 

 was less visible, though the plants on immanured plots were more 

 easily broken by the attacks of the Hessian fly, than on plots manured 

 with basic slag. Experiments on the effect of Oscinis frit on oats 



