INSFXTS INFESTING THE PEAR TREE. 



CHAP. 



The Oyster-fomied Scale (Dia>ipii ostrce- 



/i/niiin) 55 



The Pear-tree Scale (Lecanium pyri) 56 



The Pear-tree Borer {.1i(jeria pyn) 57 



The Pear-tree Scolj'tus (Scolyttis pyri) 58 



The Branch and Twig-burrower {Polycaon 



ronfertun) 59 



The Pear-tree Psylla {Pnylla pyri) 60 



The Pear Slug (Selandria ceraici) 61 



The Pear-leaf Caterpillar (Nematus) 62 



The Thrips 63 



The following insects also infesc the pear 

 tree: 



The Woolly Aphis (Schizoneura lanigera). 

 The Oyster-shell Bark-Louse (Agpidiotus con- 



chiforrnU). 



The Greedy Scale (Aspidiotus rapax). 



The Round-headed Apple-tree Borer (Saper 



da Candida). 

 The Flat-headed Apple-tree Borer (Chryso- 



bothri^ femorata). 

 The Apple-twig Borer (Bostrichus hica/uda- 



lux). 

 The Red-humped Caterpillar (A'o^orfonf a ooti- 



cinna). 

 The Goldsmith Beetle (Cotalpa lanigera). 

 The Red Spider {Tetranychun telariut:). 

 The Yellow Mite. 



The Codlin Moth (Carpocapsa pomm>eUa). 

 The Plum Curculio {Conotrachelux nenuphar). 

 The Apple Curculio (A7itItonomti\ (juadrigib- 



bun). 

 The Quince Curculio (Conotrachehm cratcegi). 

 The Green Fruit-beetle (Gymneti;- tiilida). 



CHAPTER LV. 



The Oyster-formed Scale of the Pear and Apple. (Cal.) 

 (Diaspis ostreseformU — Curtis. ) 



Synonyms. — Aspidiotus ostresejormis — Ruricola. Aspidiotus 

 circ u laris — Fi t c h . 



Order, Hemiptera ; 

 Sub-order, Homoptera ; 



I 



Family, Coccid.e. 



[A small, circular scale insect, infesting pear trees]. 



In the United States Agricultural Report, 1880, Professor J. 

 H. Comstock Avrites of this species as follows : 



" This is a common species on the pear and apple in Eng- 

 laii<l. Although I do not know of its occurrence in the I'nited 

 States, it will be strange if it is not found here." 



