98 (October, 
In Neuwroptera: several Trichoptera, belonging to the genus Lim- 
nophilus, and one of the Perlide. 
In Hemiptera: Heterocordylus tibialis, Gastrodes ferrugineus, a Salda, 
which escaped, Iassus fruticola, &c. 
In Lepidoptera: Arctia plantaginis, five or six, all 2, Hupithecia 
nanata and callunaria, Penthina sp., Phoxopteryx biarcuana, Retinia 
cosmophorana and coniferana, Pyrausta purpuralis, Herbula cespitalis, 
Gelechia ericetella, G. longicornis, &e., &e. 
In Diptera: several Tipule, one of which is, I think, excisa, Schum.., 
a Bibio, and several Syrphi. 
Altogether there were about fifty species of insects on the snow. 
The subject of the second case of involuntary migration is Hremo- 
coris erratica (Hemiptera-Heteropte:a), a species which, according to ° 
“ British Hemiptera,” is usually “taken singly, by beating juniper- 
bushes,” but which, in at least one instance, has been found more gre- 
gariously under dead leaves ; this, however, at a time of the year (April) 
when the individuals in question may still have been in winter quarters. 
I have found this bug, though rarely, upon both juniper and pine ; and; 
believing it to be entirely confined to these two plants, it was with some 
astonishment that I saw it living in small companies, below stones on 
the bare and treeless summit of Mor Shron, and far away from either 
juniper or pine. 
At first I thought that the mountain insect might be a different 
species from the pine one, but J find that it is identical ; and, till my 
visit to Benmuedhu, I could not understand how the Hremocoris came 
to be found under such different circumstances. After seeing, however, 
the great number of insects displayed on the “wreck charts” of that 
mountain, I have begun to think that we have here an instance of in- 
voluntary migration, which has resulted in the establishment of a 
colony of insects, with habits modified to suit their changed cireum- 
stances. Thus, intead of being dwellers in the valley, they have become 
dwellers on the mountain; instead of inhabiting trees or bu shes, they live 
under stones; and instead of deriving their sustenance irom species of 
Conifere, they feed upon (I think) Hmpetrum or Calluna. That the 
insects in question are not, like the Benmucdhu specimens, recent emi- 
grants, is sufficiently shown, I think, by the fact that all stages—larve, 
pupe, and perfect insects—are to be found under the stones on Mor 
Shron ; and that they are not voluntary migrants is probable from the 
circumstance that in the interval between the pine woods and the sum- 
mit of the mountains, no specimens have been found. 
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