184 
gramma evanescens QQ were put to them. These females 
however would by no means attack the eggs of the har- 
vest-man. The reason might of course be that these fe- 
males were perhaps not fecundated, but I got that parti- 
cular apprehension, that the reason was the unwillingness 
of the wasps, because these eggs did in no way whatever 
affect the sense-organs on their antennae. I have in the 
process of years made numerous experiments with 7richo- 
gramma, but in no case did I encounter such a decided 
indifference on the part of the wasp as in the present case. 
On August 16th 1918 a portion of eggs of Crocallis 
elinguaria was found on grass in Hareskoven; this por- 
tion was divided in two parts, each of which was kept 
in a separate tube; to one of the portions was put a fe- 
male of Trichogramma, which at once began to lay its 
egos. Both tubes were then hibernated in a room which 
was constantly warmed. Early in April 1919 moth-larvas 
were bred of all the eggs and at the same time from 
both portions. As it thus appears it had not had the 
slightest influence on the one half of the eggs that they 
had been attacked by the Trichogrammas. 
On July 27th 1919 a bunch of unknown eggs was 
found on Glyceria in the ditch in Skovroddam in Rude- 
hegn. On July 28th a number of females of Tricho- 
gramma was captured on the ground in Fortunens Inde- 
lukke. The latter locality is so far distant from water, 
that there can have been no connection with Sialis. 
Some of these females were put to the eggs from Skov- 
roddam and began at once to attack them. After a few 
days a Geometra-larva was bred from part of the eggs, 
which larva I have not succeeded in getting determined. 
The remainder of the eggs remained temporarily unbred. 
From Septbr. Ist to 4th 1919 about 200 Trichogramma 
were bred from these eggs; most of them were winged 
and only very few were wingless. This experiment shows 
that eggs which are exposed to be attacked from the ty- 
