264 COCCI DTE— SHIELD- LICE. 



The Cocoidge, althoufrh tliey furnish an in\^aluable dye 

 and many articles of commerce, are among; the most hurtful 

 of insects in jjardens and iiot-liouses. In 1843, the orange- 

 trees of the Azores or Western Islands were nearly entirely 

 destroyed by the Coccua Hcsperidum; and in Fayal, an 

 island which had usually exported twelve thousand chests 

 of oranges annually, not one was exported.^ 



1 Baird's Cyclop, of Nat. Sci. 



