APPENDIX 205 



little brown scale, taking its name from the resemblance 

 to a miniature oyster shell. It attacks the pear, and 

 should be destroyed in the same way as the mussel scale. 



The Orange-tree Scale {Lecanium hesperiduni) should 

 be treated in the same manner. 



The White Woolly Currant Scale (Pulvinaria ribesice) 

 has only been lately observed in England, though 

 common on the Continent. The scale itself is dark- 

 greyish brown. It exudes a white woolly matter, which 

 forms a nest for its eggs. The larvae are orange- 

 coloured, and, like those of the other scales, run about on 

 the plants for a little time before settling down. They 

 attack the black, white, and red currants, the injury 

 arising from the same causes as that done by the other 

 scale insects. The same remedy may be employed as 

 for the mussel scale. 



Having now come to the end of our list of insects, 

 mention must be made of two injurious little animals 

 belonging to the order of the Acarina or Mites, of the 

 class Arachnida. 



The Red Spider (Tetramychus telarius) is an ex- 

 ceedingly small oval mite, with four pairs of legs, two 

 pointing forwards and two backwards. Its colour 

 varies from yellowish white to reddish. It is very 

 injurious to the leaves of the plum and other fruit trees, 

 spinning a white and shiny web on the under side, and 

 making them assume a yellowish, marbled appearance 

 on the upper surface. Hot dry weather seems to be 

 most favourable to them ; therefore the trees should be 



