The Genitalia 



of 



The Group Geometridae 

 of the Lepidoptera 



of the 



British Islands. 



AN ACCOUNT OF THE MORPHOLOGY OF 

 THE MALE CLASPING ORGANS AND THE 

 CORRESPONDING ORGANS OF THE FEMALE. 



BY 



F. N. PIERCE, F.E.S. 



ILLUSTRATED BY THE AUTHOR. 



LIVERPOOL . 

 F. N. PIERCE, THE ELMS, DINGLE. 



1914. 



