460 THE BARK LOUSE. 



sect would be killed, and the tree soon recover from 

 its temporary weakness [Fitch). 



(4) The Snapping Beetle — Chrysohothris femorata : 

 Fabr. This very much resembles the common 

 borer, and preys upon the apple and peach. The 

 worm is about one-half an inch in length ; greenish- 

 black in color ; and its burrow is flat, instead of 

 round. It has a very powerfal enemy in a little 

 parasitic bee-like insect, about c ne-tenth of an inch 

 in length. The female of this parasite probably 

 discovers the borer when it is lying just beneath 

 the bark, before it has commenced its burrow ; and, 

 piercing the bark and the skin of the insect, it de- 

 posits its eg^, the larva from which is to subsist 

 on it, and finally to destroy the borer. The same 

 means may be used in this case as were with the 

 common borer (Fitch). 



(5) Tlie Bark Louse — Aspidiotus conchiformis : 

 Gmelin. Coccus arboriim linearis : Modeer. Diaspis 

 linearis: Costa. Although very small, this is one 

 of the most injurious insects which attack the apple. 

 It probes the bark, consumes the sap, checks the 

 vigor of the tree, and, where it makes its appear- 

 ance in considerable quantity (as is often the case), 

 causes death in three or four years. 



Its appearance is that of a dark-colored, or black 

 scale, resembling an oyster-shell in shape, adhering 

 to the bark, and particularly attacking young trees. 

 This scale is about one-eighth of an inch in length, 



