ARKIV FÖR ZOOLOGI. 



BAND 8. N:o 9. 



Contributions towards the Comparative Mor- 

 phology of the trophi of the Lepidopterous 



Leaf-Miners. 



By 

 IVAR TRÄGÅRDH. D. Se. F. B. S. 



Experimentalfältet. Sweden. 



With 67 text-figures. 



Communicated January 22th 1913 by Chr. Atjrivillius and Y. Sjöstedt. 



l. Introductory remarks. 



Already a long time ago the leaf-miners attracted the 

 attention of entomologists, and we find. in the papers by 

 De Geer [1.] and Réatjmur [2] very good accounts of the 

 habits, the shape of their mines, and the cocoons of several 

 leaf-mining species, both Coleoptera, Hymenoptera and Le- 

 pidoptera. 



Since that time, a wast store of knowledge, especially 

 concerning the microlepidopterous leaf-miners, which also far 

 outnumber those of other groups, has been accumnlated by 

 the efforts of German, and perhaps still more, English ento- 

 mologists. The mines have been classified according to their 

 shape, the arrangement of the frass has been carefully studied, 

 and a number of excellent monographs on the different species 

 have been published; in some instances, as in the genus 

 Nepticula, we are even so far advanced, that we are almost 

 able to tell with certainty the name of the species by exa- 

 mining the abandoned mines. 



If thus, in some respects, our knowledge of the leaf-miners 

 is even very intimate, there are, on the other hand, other 



Ark-i v för zoologi. Band 8. N:o 9. 1 



