Notes on the earlier stages of Orchestes 
FASE 
by 
Ivar Trägardh. 
With 4 textfigures. 
j 
In a previous paper, »Contributions towards the Meta- 
morphosis and biology of Orchestes populi, O. fagi and O. 
quercus», the author described the larvæ and pupe of these 
beetles, especially with a view to investigate their structural 
adaptations to their leaf-mining habits. 
Only of one species, ©. populi, I was, however, able to 
examine the successive larval stages; of the other two I had 
only full-grown or nearly full-grown larve at my disposal and 
was consequently not in a position to describe any changes 
in the external morphology which they may undergo during 
their growth. 
As pronounced changes take place in ©. fopulz during 
its growth — thus in the 1St instar no prothoracic plates are 
developed, the head capsule is not retractible in the pro- 
thorax and the cuticle is quite smooth — we may, however, 
presume that the same is the case in O. fagz and O. quercus. 
During a visit at Hvidkilde in the South of Fyn, Den- 
mark, in the middle of May last year I had an opportunity 
of procuring the earlier larval stages of O. fagz and notice 
the beginning of the mines. 
1 Arkiv f. zoologi. Bd 6. N:o 7. Uppsala & Stockholm 1910. 
