Plate V. 



yl], The Spangle Giill, ur Gall furmed by Nfurotcrus Icnticulaiis, the X'^rthenogenutic 

 generation of the fly whicli, in its alternate sexual generation, jirodaces the Currant 

 Gall, .'l.j ; D-i, the Root Gall formed by Biorhiza ayitera, the parthenogenetic gnneratiun 

 of the fly which, in the altei'nate sexual generation, produces the Oak Apple Gall, B^ ; 

 C], the Artichoke Gall proi.lnced by Apliilotrix fecunilairix, the parthenogenetic genera- 

 tion of till' fly wliic'h, in its alternate sexual generation, prndui'es the Hairy Catkin 

 Gall, (-V 



