THOMAS BELL, Esq., E.B.S., 
WHOSE KINDLY SPIRIT AND SYMPATHISING AID FOSTERED IN THE EARLY 
LIFE OF THE AUTHOR A LOVE OF 
NATURAL SCIENCE, 
AND WHOSE 
FRIENDSHIP OF MORE THAN FORTY YEARS HAS AFFORDED HIM UNMIXED 
PLEASURE, 
THIS MONOGRAPH 
OF THE 
BRITISH APHIDES 
BY THE AUTHOR, 
