502 ON SOME NEW AND RARE BRITISH COLLEMBOLA 



found in the hydrants and cisterns of the city of Edinburgh, 

 causing much alarm. These were submitted to Mr. Evans 

 for identification, who reported that the commonest form was 

 the blind Folsoniia ( Isotoma) fiinetaria, but in one phial he 

 discovered about a score of F. i/iimifa."''' Prof. Carpenter 

 refers a single specimen taken in dried seaweed on the 

 beach at Whitley Bay in the spring of 1907 to this species, 

 and it gives me much pleasure to be able thus to record its 

 occurrence locally. 



Genus ISOTOMA Bourlet 

 Isotoma hibernica Carpenter. 



Isotoma hibernica Carpenter, Scientific Proc. Royal Dublin 

 Soc, xi. (n.s.), p. 40, pi. ii., figs. 1-7, 1906. 



This is a large form, most closely resembling the common 

 I. viridis, but easily distinguished by the long spring, which, 

 when set, reaches to the bases of the intermediate pair of legs, 

 by the arrangement of the ocelli and the relative lengths of the 

 antennal segments. Dr. Jackson has taken this interesting 

 springtail on two occasions in Delamere Forest, together with 

 another large and equally interesting creature, Orchesella 

 rnfescens (Linn.), my identification of both these insects being 

 confirmed by Prof. Carpenter. /. hibernica was discovered 

 by Prof. Carpenter in the June of 1905 on the shores of Lough 

 Melvin, County Leitrim, and described and figured by him a 

 few months later. I know of other records. 



/. cinerea (Nic), /. sensibilis Tullb., /. viridis Bourl., /. 

 grisescens Schafif., and /. palustris (Miiller) occur in the 

 counties of Northumberland and Durham. 



Genus AGRENIA Burner 



Agrenia bidenticu lata (Tullb.). 



Isotoma bidenticulata Tullberg, Ofver. af Kongl. Vetenskaps- 

 Akad. Forhandl., xxxiii., no. 5, p. 35, pi. ix., figs. 17, 18, 

 1876; Agrenia bidentictdata Carpenter, Irish Naturalist, 

 xvii., p. 176, figs. B, 1-4, 1908. 



* Proc. Royal Phys. Society of Edinburgh, xvii., no. 5, p. 197, 1908. 



