PLATE XIII. CocciDAE^ Scale Insects. 



1. Orthezia insignis Douglas, — greenhouse orthezia, x 2.5. 



2. Astcrolecanium variolosiim Ratzeburg, — pit-making oak scale, 



X I. 



3. Gossyparia spuria Modeer, — elm scale, x i. 



4. Kermes sassceri King, x 2. 



5. Phenacoccus acericola King, — woolly maple leaf scale, males 



on bark, x i. 



6. Pheyiacoccus acericola King, — females, x i. 



7. Pseudococcus citri Risso, — common mealy bug, x i. 



8. Lecanium corni Bouche, — European fruit lecanium, x i. 



9. Pulvinaria vitis Linnaeus, — cottony maple scale, x i. 



Photographs: 3 and 5 by W. E. Britton; others by B. H. 

 Walden. 



