282 
The development from egg to imago is very fast, as a 
rule from two to four weeks. 
The following are some dates: 
5/, 11 Sialis eggs. Bidstrup fen. bred 2°/,—22/, 1911. 
5/, 07 Sialis eggs. Bidstrup fen. bred 24/, 07. 
24/, 07 Sialis eggs. Ermelund. bred 1%, 07. 
Stratiomys eggs on Typha latifolia, in a small pond 
near Fuglsangsoen in Dyrehaven. ?/, 11 bred 20-23/, 1911. 
Merrit Skov Lolland 2°/, 13 bred 3!/, and !/; 1913. 
Aterix eggs July 1915 on Linding Bridge at Varde Aa, 
Norholm, Jutland bred July 1915. 
Eggs of an unknown Lepidopterous insect laid on 
Typha latifolia, Fuglsangssö, Dyrehaven. From a very 
large portion of these Lepidopterous eggs which were 
laid amongst Stratiomys eggs on a plant in the water, 
collected 2°/, 1908 were bred on 3%, and following days 
753 Trichogramma; amongst these were hardly any apte- 
rous forms, but on the other hand numerous winged males. 
Two lots of eggs of an unknown insect, laid on 7y- 
pha latifolia, Fuglsangsö, Dyrehaven, collected ?/, 1911. 
bred 11/, 1911 and °-7/, 1911, one specimen from each egg, 
all males from the one lot and all females from the other. 
From 1 lot eggs of Sialis lutaria bred 
315 females 
324 wingless males 
0 winged males. 
From 1 Smerinthus ocellata-egg bred 
20 females 
1 winged male. 
Experiments: On °/; 1909 were found a number of 
eggs of Arctia caja at Fonstrup Dam, Grib Skov, and on 
the same day a female 7richogramma was caught and 
confined together with these eggs. It was soon observed 
to be busily engaged in laying its eggs, but on 15/, 09 
were bred larve of Arctia caja from all the eggs, no pa- 
rasites appearing, Perhaps taken too late, 
