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 
(Forjicula auricularia L.), in both full grown specimens and larvæ. 
The length of the 3. stage maggot is 4 1 /2—10 mm, the skin has 
no 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 41 *). 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 a 
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 
1 ) Undersøgelser etc. II p. 237. I am sorry to have made a wrong state¬ 
ment in this paper, referring Fig. 89 to this undetermined larva; in 
reality the figure represents the anal end of a maggot of Digonochæta 
setipennis Fil. 
