7894 



Insects, 



Beschreibung der in den Waldern Preussens und der Nachbarstaaten 

 als schadlich oder niitzlich bekannt gewordenen Insekten,' Berlin, 

 1839. 



It remains, in order to complete the history of our larva, to notice 

 its insect enemies, and more especially its parasites. Of these we have 

 ourselves only observed among the Hymenoptera, Tryphon aulicus 

 and T. variabilis, Campoplex argentatus and Eulophus Lophyrorum, 

 whilst among the Diptera we are only able to name Tachina bimaculata 

 as having appeared from the cocoons of our insect. Hartig gives in 

 addition to these, Cryptus leucosticticus, C. flavilabris, Phrygadeuon 

 Pteronorum, P. pugnax. Mesochorus Laricis, Campoplex retectus, 

 Tryphon Lophyrorum, T. Tenthredinum, T. ha3morrhoicus, T. calcator, 

 Exenterus marginatorius, E. oriolus, E. adspersus, Metopius scobricu- 

 latus, and Torymus obsoletus; and of Diptera, besides those mentioned, 

 Tachina gilva and Musca stabulans. 



We pass by in silence the notices by Miiller in the work above 

 referred to, as the determination appears to us to be too uncertain ; but 

 Ratzeburg, in his Wirths-System, mentions, in addition to the Hymen- 

 optera above named, Campoplex carbonarius, Cryptus incertus, C. leuco- 

 merus, C. nubeculatus, C. punctatus, Hemiteles areator, H. crassiceps, 

 Mesochorus areolaris, M. scutellatus, Ophion merdarius, Pezomachus 

 cursitans, Pimpla rufata, Tryphon impressus, T. leucosticticus, T. 

 lucidulus, T. Rennenkampffii, T. scutulatus, T. triangulalorius, Ptero- 

 malus lugens and P. subfumatus. Of all these Phrygadeuon Ptero- 

 norum is the most frequent parasite. Some of the above Ichneumons 

 are parasites on parasites. 



Coccus o/ the Rose. — Wheiij hunting on a north wall for large garden spiders I 

 could not but notice a Coccus in great abundance on the older stems of a rose bush, 

 both the male and female insects being visible to the naked eye. For many reasons I 

 for some lime believed this to be a species entirely different lroui that on the orange. 

 The external appearance of all the shields was very different, and when these were 

 turned over the females were so much larger at the head as to be quite different in 

 shape, and of a much darker colour. The eggs, also of a darker colour, were laid in 

 a more or less circular position, and most of the males contained a fly entirely different 

 from that I had previously described. But these were the only differences, and ulti- 

 mately, after a very careful examination, I traced both males and females, the former 

 more especially, through exactly the same metamorphoses as I have described in my 

 former paper. The small fly J have alluded to as being present in some of the male 

 shields, and, as I found afterwards, in those of the female also, is a species of ichneu- 

 mon, but its presence alters the external character of the Coccus very little, a slight 



