186 
Ichneumon fossorius, Muller. The female, on the 15th of September, from 
the pupa of Noctua Typhoe. 
- oratorius. The male, in summer, from the pupa of Noctua festiva. 
- saturatorius. Female from the pupa of Noctua phragmitidis. 
They here remark the curious fact of the Ichneumon and the Moth being 
developed at the same time, but that the caterpillar of the latter is only to 
be seen nine months later ; they, therefore, suggest that the eggs of the Ichneu¬ 
mon are probably deposited near those of the Moth, and that the larvae of the 
former subsequently work their way into the body of the caterpillar, or that there is 
a second brood of the Ichneumon. The latter is certainly the most plausible sup¬ 
position, and it is not improbable that the Ichneumon is not confined to the cater¬ 
pillar of one moth, as we shall observe under Pimpla rufata , and that thus the 
exigency is met. 
Ichneumon lineator, Fab. Male, on the 4th of June, from the pupa of Geo 
metra elutata. 
- monitorius, Panz. Male and female, from the middle of June to 
the end of July, from the pupae of Noctua pronuba, and but one parasite 
to each. 
- ambulatorius, Fab. On the 13th of July, from a pupa of Noctua 
polyodon. 
- vadatorius . Female, on the 10th of June, from the pupa of Noc¬ 
tua pronuba. 
•- culpatorius. On the 20th of June, from the pupa of Noctua cu 
cubali, which had over-wintered; in this the wings were tinged with a 
dark cloud: and on the 29th of August, from a pupa of the unknown 
caterpillar of a Noctua,_ which had changed on the 29th of the same 
month, in which the wings were silaceous. 
This difference of colour in the wings arose probably from the different quality 
of the food of the larva, a fact analagous to which we observe in many of the lepi- 
doptera, which feed on two different plants, and producing a similar effect in the 
colour of the imago. 
Mesoleptus limitarius, Grav. Upon Nematus ventricosa, of Klug, which 
feeds upon the currant. 
-- exornatus, Grav. Upon a new Nematus described in both sexes 
but without a name, which feeds upon Pinus abies. 
Tryphon exstirpatorius , Grav. Upon a Nematus (the Tenthredo Betulce 
of Fallen), which feeds upon a willow. 
Trogus alboguttatus, Grav'. The male from Ihe pupa of Noctua pudi- 
bunda , on the 15th of June, and the female on the 8th of July. 
- flavatorius. The male and female, in June and July, from the pupae 
of Sphinx Salicis. 
