378 ORDERS OF PTILOTA. 



v are preyed upon by the grubs when hatched. Others de- 

 posit their eggs in the leaves or stems of various plants, 



Piinpla manifciUtor depositing iti Cjfgt In wood IUTB. 



together with an irritating matter, which causes the pro- 

 duction of galls or warts, often of a large size, upon the 

 substance of which the larvae, when hatched, continue to 



Oak-apple and Crnlpi qucrcu.folii. 



feed until they assume the perfect state ; and the remainder 

 place their eggs in slits in the stems of plants, upon the 



