ON SOME NEAV AND RARE BRITISH COLLEMBOLA 497 



Walter E. Collinge would I tender my sincere thanks for their 

 kindness in presenting me with their various and invaluable 

 works and papers upon the Collembola. 



Some of the most interesting records herein are due to the 

 kindness of various friends in sending me material, and I 

 would take the opportunity of thanking my friends Dr. A. 

 Randell Jackson and Dr. Norman H. Joy for their kindness 

 in this connection. 



Although up to 1907 only one species of spring-tail was 

 recorded from our counties, a very large proportion of the 

 Collembola known to occur in the British Isles have now been 

 found in the Northumberland and Durham area; but as I 

 have not had the opportunity for collecting except in a very 

 circumscribed area, and have not attempted any systematic 

 collecting for minute forms or for forms restricted to certain 

 conditions and habitats, I do not consider it advisable to 

 compile a local list at the present moment, though I hope that 

 with Prof. Carpenter's continued help and collaboration this 

 may be done in the near future. 



The classification I have to a large extent adopted is that 

 evolved by Borner* and followed by Linnaniemi (Axelson)| 

 and other prominent Continental entomologists. It seems to 

 form a more natural and easier grouping than our older 

 classification. Though I have not attempted to go into the 

 synonymy of the species, I have included a few useful 

 references in connection with most of the species previously 

 unknown to us as British. 



Apart from those that are here added to the British fauna, 

 many records of rare and interesting spring-tails are 

 mentioned, most of the species having only recently been 

 included in our known fauna through the researches of Prof. 

 Carpenter and Mr. Evans. 



* Zool. Anz., 1900, etc. 

 t Die Apteiygotenfauna Finlands, I. Allgemeiner Teil, HelsingforSj 1907. 



