WATER MITES. 



155 



CASE Atax Bonzi {Claparcdc, Studien an Acariden). — 17. Magnified sketch of newly 



developed larva, copied from Claparede's figure. 

 No. 17. 



Atax Bonzi, which formed the subject of careful study, and an 

 admirable memoir by M. Claparede, is a parasite, which lives 

 within the shell of the fresh-water mussel. It is semi-transparent 

 and pale yellowish, with some brown. 



Nos. 

 18, IC. 



Atax globator {Mull.). — 18. Magnified sketch of male ; 19. Ditto of female ; 

 both copied from Miiller's figures and descriptions. 



The male has a prolongation of the body behind like a tail. 



It is virescent, except this prolongation, which is pellucid. The 



female is round and pale blue, with virescent legs. 



Hydrachna globator, male. Hydrachna globator, female. 



>:o. 20. Hydrachna buccinator {Mull.).— 20. Magnified sketch of ditto, copied 

 from Muller's figure and description. 



Another tailed species. The body is red, black behind, and the 

 tail yellow. 



<o. 21. Atax miniata {Koch).— 21. Magnified figure of ditto, copied from Koch's 

 Arachnidre. 



Of a rich red-lead colour. 



io. 22. Atax varipes {A'och).—% Magnified figure of ditto, copied from Koch's 

 Arachnidce. 



Body pink with dark markings behind, legs varied with white 

 and brown. . 



