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Show 642 MR. A. D. MICHAEL ON THE [Dec. 1, was fairly common in the nests of T. ccespitum, but I never met with it elsewhere. These were the only Gamasids which we found in the nests of T. ccespitum. Another Ant whose nests were very common under the stones in the same place was Aphcenogaster testaceopitosa, a somewhat larger and almost black species. In its nest we found another Lcelaps, which I believe to be unrecorded and propose to call L. myrmophila; this also is an active Arachnid, but its activity is not shown in springing on the Ant, I never saw one upon an Ant during all m y searches: on the other hand, the Ant seemed to take considerable notice of the mite, and when the nest was disturbed I frequently saw the former pick up the latter in its mouth and carry it off to a place of safety, just as it did with its own pupae and larvae, and as Ants are said to do with some of the beetles which frequent their nests. This Gamasid was tolerably common in the nests of the Aphcenogaster, but I did not ever capture it elsewhere. So strictly were the three species found in Corsica confined to the nests of the respective Ants that when I saw the species of Ant I could tell at once what Gamasids I was going to find. I did not see any species except L. myrmophila in the nests of the Aphcenogaster, nor did I obtain any Gamasids from the nests of such other species of Ants as I was able to search in Corsica. After leaving Corsica I crossed Italy and spent the summer at lgls, a small village about 1100 feet above Innsbruck. Tbe slopes of the Patcherkofl, upon which the hamlet stands, are clothed with pine and fir woods ; and amongst them ants' nests abound. I had considerable opportunities of searching them ; I, however, did not find there the same species of Ants as in Corsica, nor did I see any specimen of either of the three Gamasids which had inhabited their nests ; on the other hand, we did find other Gamasids in the nests of other Ants. In the first place, Mr. M . J. Michael brought in some specimens of a largish Gamasid which he had found in the nest of some ants in the ground; this creature also seems to be unrecorded, and I propose calling it Lcelaps Icevis. Unfortunately my cousin, expecting to find plenty more, did not secure specimens of the Ant; so that I cannot say what species it associates with, for we were not successful in finding it again. I therefore only know that it was found in an ants' nest and that it does not appear to have been found elsewhere. One of the commonest Ants was Camponotus herculeanus, a large species which amongst other habitats seems specially partial to the stumps of pine-trees which are left in the ground after the trees have been felled. These stumps, both above and under ground, are constantly riddled by the passages and chambers of the Ants, and such nests, which I believe were made by race ligniperdus of the Ant, proved perfect store-houses of Gamasids: not that every nest contained Gamasids, far from it; in many nests I could not find one ; but in a considerable proportion of them the Arachnids were present in substantial numbers, although not usually in great abundance, all of |