PREFACE. 
Ill 
The Author cordially thanks those numerous friends 
who have personally assisted him in procuring speci- 
mens for description. Had they not done so, many 
species of Aphides never might have come under his 
notice. Particularly he would mention the names of 
the late Mr. Francis Walker, of the British Museum, 
whose knowledge of species was large, and whose aid 
was always generously proffered ; of Mr. Charles 
Barrett, who kindly put himself to much trouble in 
forwarding specimens from different parts of England ; 
and also to Mr. Thomas Hardy, the Naturalist of the 
Cheviot. 
Thanks are also given to Mr. W. Wilson Saunders, 
to Sir John Lubbock, Bart., and to Mr. Alfred Smee. 
Finally, the Author feels himself under great obliga- 
tion to Professor Bupert Jones and the Eev. T. 
Wiltshire, for their friendly and searching criticism of 
the proof sheets, and for their assistance in passing the 
volume through the press. Once more he would notice 
the attention paid by Mr. George Standish in success- 
fully completing the tedious operation of colouring the 
numerous lithographic plates. 
The present Monograph in no way pretends to 
include all the species of Aphides which inhabit Great 
Britain ; it really includes those only which have come 
alive under the Author’s observation. Where he has 
failed to procure species known to others, he asks 
indulgence, on account of the comparatively sedentary 
life to which circumstances have consigned him. 
Weycombe, Haslemeke; 
October^ 1876 . 
