152 



ARACHNOIDEA, 



CASE Hydrachna Geographica {Koch). — 9. Magnified sketch of ditto, copied 



No. 9. 



from fio-ure in Koch's Arachnidae. 



This is a very handsome species, with something like a geo 

 graphical distribution of patches of scarlet and black. 



Hydrachna geographica. Copied from Miiller. 



Koch breaks up this group into three additional genera, chiefly- 

 founded upon the dimensions and proportions of the palpi. They 

 do not appear to deserve separation from Hydrachna. They are — 



LIMNESIA, HYDRYPHANTES, and HYDRODROMA. 



Limnesia fulgeda. Copied from Koch. 



3rd Section. — River Water Mites. 



Legs fitted for swimming. Two eyes. 



