23 
that on the trees, where I collected the infested fullgrown specimens, 
many younger were present, all of which were not infested. 
The maggots transform to puparia in the ground; in very rare 
cases in the empty skins of the hosts. I have seen maggots 
pupate in the days from ?/7—15/7, the flies emerging from ?5/7—3/s 
the same year. 
Exorista blepharipoda B. & B. 
I have reared this fly from the caterpillars of Acronycta psi L. 
and A. tridens Shiff. The skin of the hosts shows no marks indi- 
cating the presence of the maggots inside the body. In each host 
may occur from 2—7 living parasites. After the emergence of 
the full grown maggots all the organs of the hosts have disappeared. 
By an examination of the respiratory system of the host I succeded 
in finding the points, where the parasites were connected with the 
hosts body. The chitinous funnel originates from a trachea and in 
cases from the point, where the main trachea is connected with 
the stigmatal branch. 
The maggots transform to puparia in the ground and the flies 
are reared next summer (f/6—27/6). 
Meigenia floralis Fall. 
Meigenia floralis is a parasite in the larvæ of a chrysomelid 
beetle Gastrophysa viridula De Geer. On the 23th of July I saw 
both younger and elder. larvæ with eggs of the fly and among the 
moulted skins of the larvæ, which remain attached to the under- 
side of the leaves, several were. noticed bearing egss. Only a 
relatively small number of the larvæ were infested by the parasites. 
In all I collected 79 infested larvæ. Of these 36 were not full- 
grown; in not a single of these the parasite came to full development; 
the host moulted before the parasites hatched out of the eggs, 
and the eggs which were deposited on the skins were threwn off 
together with these. The rest of the larvæ — 43 — were full 
grown; of these 17 were dissected from time to time, and by 
means of these dissections I sueceded in finding 3 parasites; in 
