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circumference, the bag being made of coarse linen, with 
the corners rounded and the seams carefully sewn so 
that the small insects cannot hide there. The locality 
should preferably be a sunny opening in a wood, the 
banks of a road through a wood, a highlying meadow or 
some similar place. The vegetation must be somewhat low, 
a meadow in a forest with high grass gives nothing before 
the hay is made. I am of the opinion that it is due to 
the high grass that the best time for collecting is after the 
middle of July. Certainly the insects emerge late in the 
summer but as they have to lay their eggs at the same time 
as the greater part of other insects they ought to be able 
to be found in the early summer also if they were not 
hidden by the grass. 
Both Ophioneurus and Trichogramma can be taken at 
their breeding places from the end of May, but the host 
of these two species lives above the grass too. When a 
suitable place is found where it can be expected to make 
a catch, the ground must be swept backwards and for- 
wards, again and again on the same strip. I have often 
swept the same 200 meter bank four to five hours. 
After having swept for about five minutes you can sit 
down and without any fear leave the net open. 
All the large insects will quickly run out, but the small 
species cannot release themselves from the coarse linen 
or the seed and sweepings that are in the net. In the 
beginning of August it can be very troublesome at times 
with the quantities of grass seeds. However, it must be 
gone through, the net and contents must be minutely 
examined, when now and then a Trichogrammine can be 
seen labouriously working its way through the thick 
forest of leaves & dirt. Once the eye catches one, it is 
easy enough to take, it is only necessary to place a nar- 
row glass tube over it. (I use a tube from a Laktoscope 
about 15 cm long). Having had so much work to get free 
of the dust etc. it comes as a great relief to get on to 
