186 



Ichneumon Jbssorius, Miiller. The female, on the 15th of September, from 



the pupa of Noctua Typhoe. 

 oratorius. The male, in summer, from the pupa of Noctua f estiva. 



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 pupa? of Noctua pronuba, and but one parasite 

 to each. 



ambulator ius, 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 Betulae 



of Fallen), which feeds upon a willow. 

 Trogus alboguttatus, Grav. The male from the pupa of Noctua pudi- 



bunda, on the 15th of June, and the female on the 8th of July. 

 Jlavatorius. The male and female, in June and July, from the pupa? 



of Sphinx Salicis. 



