ON SOME NE"W AND RARE BRITISH COLLEMBOLA 503 



In 1907 Prof. Carpenter recognised A. bidenficiilafa from 

 three of the Irish provinces, Munster, Ulster, and Leinster, 

 and shortly afterwards I sent him examples collected from 

 under half-submerged stones in the Tarset Burn, near Tarset, 

 Northumberland, which he identified as that species. A. 

 bidenticvlata is a true arctic and alpine insect, having a wide 

 range in arctic and northern regions, and is, perhaps, one of 

 our most interesting additions to the British fauna, suggesting, 

 as it does, a relic of the ancient glacial fauna. Schaffer* states 

 that the Isotoma lariiiginosa described by Carlf from the Swiss 

 Engadine is referable to bideuticidata. Prof. Carpenter gives 

 an interesting account of this insect and its distribution, etc., 

 in the Irish Naturalist, September, 1903, pointing out that the 

 Irish specimens are remarkable on account of the elongation 

 of the spring, antennae and legs. In fact he regards them as 

 the type of a distinct variety (var. elongata Carp.), the speci- 

 mens from England and Scotland being somewhat intermediate 

 between the variety and the typical form. 



After finding A. hideutiadafa in England I searched specially 

 for it in Scotland, and in July, 1907, discovered it in very large 

 numbers below the Greta Falls, near Largs, and in Glen 

 Ashdale, Whiting Bay, Isle of Arran, the latter specimens 

 occurring below the beautiful Glen Ashdale waterfall, and at 

 a height of only a few feet above sea level. In July, 1908, 

 I again found the species on the Nethy, Nethy Bridge, 

 Inverness-shire, whilst my friend Mr. Evans has only recently 

 recorded a specimen of this species taken in the glen of the 

 Kelty, near Callander, on September 17th, 1906.I 



A. bideuticidata should be searched for amongst shingle and 

 under half-submerged stones. in our hill streams. 



* Fauna Avdica, Jena, 1900, p. 247. 

 t Revue Suisse de Zoologie, vi., 1899, pp. 307-310. 

 X Proc. Royal Phys. Society of Edinburgh, x\ii., no. 5, postscript, p. 200, 1908, 



