412 THYSANURA, 



CASE TsoTOMA GRISEA {Lubb.).—\%. Magnified slcetch of ditto. 

 No. i8. Uniform grey ; common in winter and spring. 



Family PODURID^ 



No. 19. ACHORUTES ruRPURASCENS {Lubb.).—Vb, Magnified sketch of ditto. 



One of the Poduridae with two claws, of a brownish-purple 

 colour. 



Achoiutes purpurascens. 1.12th ot an inch in length 



" On a hot bed, and under branches of trees. Throughout the 

 year." — {Litbhock). 



No. 20. PoDURA AQUATICA {Unit.).— 2^. Magnified sketch of ditto. 



One of the single-clawed Poduridse; opaque blackish-blue. 

 Common on the surface of standing water throughout the north of 

 Europe to Switzerland. Also found in Greenland. 



Podura aquatica. 0.08 of an inch in len.cjth. Lipura fimetaria. i-ioth of an incli in length. 



No. 21. Lipura fimetaria (Z/wz.).— 21. Magnified sketch of ditto. 



We have now left the jumping Collembola. The following 

 species only run. This species is very common, and may be 

 found in damp earth throughout the year, often engaged in 



