igo ENTOMOLOGISK TIDSKRIFT I913. 



tion of the leaf which is lying distally, outside the mine 

 retaining its green colour (g. fig. 5), exactly as one would 

 conclude from the assumption that the action of the mine 

 were to cut off the vascular bundles, tiius preventing the 

 flowing back of the sap. 



In conclusion, the result ot this investigation is that there 

 is no necessity to assume the existence of any preservative 

 substance of the leaf-mining larvae in order to explain the 

 remaining of the green colour in the mine, this phenomenon 

 being brought about simply by the damage done to the 

 vascular system, at a period when the sap is flowing back- 

 to the trunk of the trees. 



Litteratur. 



1848. Zeller, P. C. Die Gattungen der mit Augendeckeln ver- 

 sehenen blattminirenden Schalien. — Linnea Entomo- 

 logica, vol. III, s. 248 — 344. 



1855. Stainton, H. T. The natural History of the Tineina, 

 vol. I. London. 



1894. Wood, J. H. Notes on the earlier stages of the Nepti- 

 culae, with a view to their better recognition at this 

 period of their life. — The Entomologists monthly ma- 

 gazine. 2nd series, vol. V. London. 



1899. Tutt, W. a natural history of the British Lei)idoptera, 

 vol. L London & Berlin. 



1909. Schneider-Orelli, O. Die Minirgänge von Lyonetia 

 clerckella und die Stoffwanderung in Apfelblättern. — 

 Centralblatt f Bakt. Paras, und Infekt. 2 Abt. Bd. 24. 

 — Jena. 



1913 a. Trägardh, L Contributions towards the comparative 

 morphology of the trophi of the Lepidopterous leaf- 

 miners. — Arkiv f. zoologi. Bd 8, N:o 9. — Uppsala 

 & Stockholm. 



1913b. LiNNANiEMi, W. M. Zur Kenntnis der Blattminierer. — 

 Acta Soc. pro Fauna et Flora Fennica, 37, N:o 4. — 

 Helsingfors. 



