58 INSECTS INFESTING THE APPLE TREE. 



CHAPTER XIX. 



Oyster Shell Bark-louse, or Common Apple Scale Insect. 



(Aspidiotus Conchiform is — (4melin. ) 



Synonyms — Mytilaspis pomicorticis — Riley. Aspidiotus pomo- 

 rum — Bouchc. Mytilaspis pomorvm — Boiiche. Aspidiotus 

 pyrvs-mnbi.s — Rob. 



Order, Hemiptera ; ) -c^ ■^ f> 



r. 1 J XT c Family, Coccid.e. 



feub-order, Homopteka \) 



[The measurements of insects in this work are given in inches and lines. The above cut rep- 

 resents one inch divided into lines and fractions thereof.) 



[A slender, slightly-eurved seale insect, infesting deciduous 

 fruit trees.] 



Tbis s])eeies of scale insect can be found in orchards in 

 nearly all tbe central counties of California, and is very 

 destructive to apple trees, and also infests the pear and other 

 (l('ci(lui)us fruit trees. 



Fig. 12. — A piece of 

 bark infested by Oyster 

 Shell Bark-lice — colors 

 of scales, broAvn. yellow 

 and gray. 



This species can be readily distinguished from the other 

 species of scale insects that infest the apple tree and described 

 elsewhere in this work. The scale of the female is long and 

 narrow, and more or less curved, and widened at the posterior 

 end ; it measures from one line to one and one quarter lines 

 in length. Color — Dark yellowish-brown ; exuvia\ amber- 

 yellow. 



The scale of the male is smaller than that of the female, 

 and nearly straight ; it is not so dark in color, and has a mot- 

 tled appearance. 



XATUKAl. HISTORY. 



The eggs found under the female scale nuinl'cr from tliirty- 

 tive to seventy-five: the voung are hatched al»out thf tenth of 



