276 
portions of the joints of the antennæ appear to be con- 
stant in all the specimens. Although should the result of 
my placing all the species at present known under one, 
give occasion to the question being taken up after the 
war for renewed examination and a final decision, I should 
be very glad. 
I greatly doubt whether it is possible to decide if there 
is any difference between evanescens and vifripenne from 
the very short descriptions given by Walker and West- 
wood. My experience is that 7r. evanescens = semblidis 
Aur. = piniperda Wolff varies to such an extent, that it 
would be possible to describe numberless species, if only 
specimens taken in the field are examined. I have the 
species in thousands of specimens, partly bred, partly caught. 
There are large specimens and there are small. I have 
bred one single individual from the egg of a butterfly 
and I have bred thirteen specimens from another egg of 
the same brood. Of course the sculpture, size etc. are 
very different. I have light yellow, dark yellow, brown 
and dark brown specimens, and also some yellow with 
brown markings. At times I have believed it was pos- 
sible to separate them into three groups, but I always find 
intermediates just when I have believed it so nicely arranged. 
The impression I now have is that this species attacks all 
manner of eggs and that they vary somewhat after the 
different host, in short the species is undergoing a change 
but no fast points have as yet appeared. 
In the present times of war when all communications 
are stopped, it has been impossible for me to get any in- 
formation from abroad, and the future must decide whe- 
ther I am right in maintaining that at present we only 
have one species viz: 
Trichogramma evanescens Westw. 
1833 Trichogramma evanescens. Westwood. Phil. Mag. (3) Il. 1833. 
p. 444. no 21. 
