PREFACE. 
Tue present volume contains the first portion of 
the Geometre ; it is intended to complete the Group 
in Vol. VIII. 
I much regret the delay in the appearance of this 
volume, which is entirely due to the dilatoriness of 
the artist and lithographer employed on the plates. 
The Ray Society is once more indebted to Mr. 
G. C. Bignell for supplying a list of parasites known 
to affect the species treated of ; and I have again 
to thank my friend Mr. W. Denison Roebuck for his 
assistance to myself in editing the volume. 
GHO. T. PORRITT. 
CROSLAND HALL, 
HUDDERSFIELD ; 
November 13th, 1896. 
