244 
second generation in Orgyia antiqva L., Eremobia ochroleuca Esp. and 
Eupithecia innotata Hfn. On the skin of the Drybota protea Bhk., 
taken on the %/6, were seen little dark spots indicating the way, 
through which the parasites had penetrated into the caterpillars; 
few days after (!??/6—14/6) larger spots appeared around some of the 
spiracles, and by opening the. caterpillar I found the Phryæe- 
maggots fixed to the trachea originating from the spiracle. The 
parasites were full-grown on !%/6 and the flies emerged the 79/6. 
I found no eggs or traces of such on the hosts. The maggots 
which develop in the Eupithecia caterpillars are fullgrown in 
October, and the puparia hibernate; in these caterpillars was only 
found a single parasite, in those of Dryobota up to four. 
Tachina larvarum. L. 
This and the other Zachina species here mentioned have been 
found parasitic on caterpillars and belong to Pantel's I group: 
In the summer af 1911 460 cocoons of Zygæna filipendulæ 
were collected in a little wood in the vicinity of Copenhagen, where 
this species had occurred in abundance some years ago, but where 
it is now strongly decreasing in numbér, From these cocoons 116 
Zygæna emerged, 225 T. larvarum 1… 35 Ichneumon flies and 
54 were empty. From 1 to 22 eggs were deposited on a single 
caterpillar, especially on the anterior part of the body. The 
highest number of 'Tachinas bred from a single cocoon was 4, 
thus a great number of the eggs or maggots must have perished 
during the development. In order to obtain a closer examination 
of this feature I opened 150 cocoons after the hatching of the 
Tachinas and counted the number of eggs on the skin of the hosts 
and the number of puparia lying in the cocoons. The table p. 227 
shows the results: From nearly two thirds of the hosts only one 
parasite was hatched, in spite of the fact that among these hosts were 
. Speeimens on which up to 16 eggs had been deposited; from a 
fifth part two flies emerged, from eleven cocoons three and only 
