Further investigations 
upon the European Trichogramminae. 
By 
J. P. Kryger. 
Tricnogramma evanescens Westw. 
1833 Trichogramma evanescens Westwood. Phil. Mag. (3) II, p. 444. 
1918 ” ” Kryger. Entom. Meddel. XII, p. 276. 
On October 15th 1918 two eggs af Gastropacha po- 
tatoria were found on Salix repens at the fence along 
the road leading from the high way to the ruins af As- 
serbo. The eggs were hibernated in a cold room and 
nothing was done to urge the breeding. On May 31th 
1919 and the following days were from both eggs bred 
together 34 specimens of Trichogramma evanescens viz 
32 OQ and 2 SZ, all specimens winged. It will appear 
that the breeding of the Trichogrammas took place just 
in due time to enable these to find the eggs of Sialis 
on the waterplants in the neighbouring ditches. It has 
thus been ascertained that I was right in my supposition 
formerly set forth, that 7richogramma hibernates in the 
eggs of the host. Whether it is as larva, which I con- 
sider to be the most likely to believe, or as pupa must 
be left to future to ascertain. Gastropacha potatoria may 
be found abundantly along the rivulet in Bidstrup fen 
near Roskilde, at which place I have found the largest 
number of Sialis-eggs with parasites. 
On July 27th a number of eggs af a harvest-man were 
found under bark of an old trunk in Fortunens Indelukke. 
The eggs were inclosed in a tube and some Tricho- 
