ON SOME NEW AND RARE BRITISH COLLEMBOLA 50I 



F. finieian'a (L. Tullb.) is apparently common and widely 

 distributed in our islands, and it is probable that many other 

 interesting species of this group will yet be discovered when 

 more general attention is paid to the minute forms. 



Genus PROISOTOMA Borner 



Proisotoma schcetti Dalle Torre {litoralis Schdtt). 



This is another northern species, and has been regarded as 

 a truly litoral insect. Mr. Evans first found it in Britain on 

 the beach between Leith and Portobello, January, 1899, and 

 later in the same year found it commonly along the edge of 

 Methven Bog, an inland locality. 



In the autumn of 1908 I found P. schcetti abundantly in a 

 manure heap in Axwell Park (this being its first reported 

 occurrence in England), and with it a peculiar spotted 

 Achorutes, which latter, Prof. Carpenter tells me, is closely 

 allied to A. schneideri Schaffer, a species not yet recorded 

 from the British Isles. I have already stated that P. schcetti \s 

 usually regarded as a sea-shore species, and on that account 

 it is interesting to note that I had previously taken the same 

 Achorutes from rotting sea-weed at Stranraer and at Tighni- 

 bruaich in the Kyles of Bute, July, 1907. It is probable that 

 many of the species regarded by us as litoral may be found 

 wherever conditions show excessive salinity. 



Proisotoma besseisi (Packard) {z=l Isotoma spitzbergetiensis 

 Lubbock). 

 Amongst dried seaweed at Whitley Bay, Northumberland, 

 and Saltburn, Yorkshire. It is a minute and active creature, 

 jumping strongly and with great rapidity. These are the first 

 English and most southerly localities recorded. 



Proisotoma minuta (Tullb.). 



Isotoina mimita Tullberg, Ofvers. af Kongl. Vetenskaps- 

 Akad. Forhandl., xxviii., p. 152, 1871. 



This very minute species is another interesting addition to 

 our fauna. In the winter of 1905-06 several springtails were 



