214 The Irish Naturalist. [October, 



Harvestmen Liobunvm rotundum, Mcgabunus insiguis, and 

 Acantholophus cphippiatus were observed, while among the 

 spiders we saw Araneus diadema/us, Jl/eta segmeniata, 

 Af. 7ncrianw, Lycosa pulverulenta, Paradosa pullata, and 

 P. a?nmtata, in numbers. More noteworthy were single speci- 

 mens ol Erigone promiscua and Diplocephalus latifrons. Among 

 the beetles 1 we found, about the same elevation, Cychrus 

 roslraius, Notiophilus biguttatus, Nebria brevicollis, Bradycellus 

 cognatus, Ptcrostichus vulgaris, P. diligens, A?icho?ne?ius albipes, 

 Trechus minutus var. obtusus, Quedius boops, Lathrobium 

 fidvipcnne, Platystethus arenarius, Cholcva angustata (hitherto 

 unknown in the south-west), Cocciiiclla hicroglyphica, Byrrhus 

 pillula,LochmcEa sutu?alis, Apio?i striatum, and Sitones lineahis. 

 The handsome red-legged fly, Bibio pomoncc, was abundant 

 above 1,500 feet. From the foot of the mountain up to 2,000 

 feet the only molluscs observed were Ai-iou ater and Limax 

 marginahis. 



At the height of 2,500 feet, however, we were greatly struck 

 with the sudden appearance of a small, almost perfectly black 

 slug looking like a very dark form of Agriolimax agrestis, 

 which species abounds lower down in the large, white, un- 

 specified variety characteristic of western Ireland. We found 

 several specimens of this interesting slug between 2,500 feet 

 and Caher (3,100 feet) ; it often crawls over the surface of the 

 large rock-fragments which strew these higher slopes, and its 

 black colour makes it very conspicuous. On closer examina- 

 tion the wrinkles on the back showed the structure peculiar 

 to Limax, with which the form also agreed in the absence of the 

 milky slime so characteristic of Agriolimax agrestis. We were 

 puzzled by this peculiar form, which is certainly quite absent 

 on the lower slopes of the mountain. Careful study after- 

 wards led to the conclusion that it must be a small dark form 

 of Limax 7/iargi?iatus, which is certainly worthy of a distinct 

 varietal name. 



Limax marglnatus, var. nov. nlger, ScharfF. 

 Colour almost black, sides a little lighter, but no trace of bands, stripes, 

 or spots. Foot-fringe black ; sole light grey. Length, when fully 

 extended, 35 mm. Keel strongly developed on posterior half of 

 body. 



1 We have to thank our colleague, Mr. J. N. Halbert, for identifying 

 the Coleoptera and Hemiptera we collected. 



