10 ARKIV FÖR ZOOLOGI. BAND 0. N:0 7. 



typical moth larvse, consume the remaining layer of the paren- 

 cliyma, which they left intact when younger! 



The larva does not form any cocoon when it is going to 

 pupate, but lies free on its back in the centre of the blotch. 



Parasites of O. popidi. 



A eonsiderable number of the larvse, at a rough estima- 

 tion about 20 %, were attacked by ectoparasitic Hymenop- 

 tera, belonging to the Chalcididse. When opening the blotches 

 small, elongated, whitel eggs were found, lying on the black 

 floor, close beside the larva; and the larva, although not 

 dead, seemed more motionless than those in other blotches, 

 where no eggs were found ; ne v er was more than one egg found 

 in each blotch. In other blotches whiteish larvse were found 

 lying on the larvae or close at the side of them and the 

 larvse were dead and more or less deformed and shrivelled. 

 T was able to observe how they actually pierced the skin of 

 the larvse and sucked the fluids of their bodies. There were 

 two different species of Chalcididse, which were both hatched, 

 but as yet I have not been able to get them identified. 



Orchestes fagi L. 



(Pi. 1. figs. 3, 4, 9—12, 16; Pl. II. figs. 1—3, 16, 17 & 21; textfigs 4 & 5.) 



The metamorphosis of this species has been described 

 briefly by Ratzeburg [8, p. 128—129] who figured the larva 

 and pupa, and låter many other authors as Goureau, Altum, 

 JuDEiCH, PissOT a. o. have described its life-history and the 

 damage it has done. 



The material, on which the following description is based, 

 was collected partly at Arilds Läge in Skåne in June 1907, 

 partly at Båstad in June 1909. 



In both localities the larvse were verv common and not 

 a single tree had escaped their ravages. 



