AEKIV Fön ZOOLOGI. 



BAND 6. N:o 7. 



Contributioiis towards the metamorpliosis and 



Wology of Orcliestes popiili, O. fagi and 



O. quercus. 



By 

 IVAR TRÄGÅRDH. D.Sc, F.E.S. 



Upsala. 



With 2 Plates and 5 Textfigures. 



Communicated October 13:th 1909 by Chr. Aurivillius and Y. Sjöstedt. 



The metamorpliosis and biology of the three species of 

 the genus Orchestes, which form the subject of the present 

 paper, is knovvn to a certain extent. But the larval stages 

 of them hav^e been described only very superficially and 

 with regard to their biology there still remain some questions 

 which have not been settled. These gaps in our knowledge 

 the present paper proposes to fill up in some degree. 



Orchestes populi Fabr. 



(Pi. I. fig. 1, 2, 5—8, 14; Pl. II, fig. 6, 8, 9, 11—15 & 20; Textfig. 1—3) 



The metamorphosis of this species was probably known 

 already by Frisch [2. p. 31—32] and Swammerdam [12. p. 

 294]. Låter, in 1853 Hegeer [3. p. 42—45] gave a short 

 description of the larva and pupa, accompanied by figiires, 

 which latter however are not very accurate and only give 



Arkiv för zoologi. Hand 6. iV;o 7. I 



