218 
systemet, viste sig ved nærmere Undersøgelse ikke at være begrundet. 
Tragtenes udelukkende Forekomst i Spiraklernes Nærhed savner 
derfor foreløbig Forklaring. Antallet af levende Snyltere i de en- 
kelte Værtlarver varierede fra 1 til 7. Larverne borede sig ud af 
Værterne og forpuppede sig i Jorden, Pupperne overvintrede, og 
Fluerne kom frem næste Sommer i Slutningen af Juni og i Juli. 
Summary. 
The maggots of Rhacodineura antiqua are parasitic in earwigs 
(Forficula auricularia L.), in both full grown specimens and larvæ. 
The length of the 3. stage maggot is 4//2—10 mm, the skin has 
mo spines; the pharyngeal skeleton is figured in the second part 
of my investigations on Tachinid larvæ as belonging to an ,,un- 
determined larva in earwigs"!), The atrium of the anterior spiracles 
consists of a long cylindrical tube, the end of which terminates 
in some cases with a single knob; sometimes the knob however is 
divided in two or even in four knobs. It is interesting to observe 
that the increase in number of the knobs is accompanied by aå 
reduction .in size, in order that the breadth of the end of the atrium 
is constant in all cases. At the end the atrium is surrounded by 
a chitinous rooflike frame. The posterior spiracles consist of a 
large deep black tube, enclosing the atrium, which terminates by a 
number of small elongated knobs. 
I have found newly emerged flies in June and July. 
Where the eggs are deposited and in which manner the maggots 
penetrate into the earwigs I do not know. The boring out of the 
parasites takes place through the membrane between the head and 
the thorax or between the thorax and the abdomen. The larvæ 
A Undersøgelser ete. II p. 237. I am sorry to have made a wrong state- 
ment in this paper, referring Fig. 39 to this undetermined larva; in 
reality the figure represents the anal end of a maggot of Digonochæta 
setipennis Fll. 
