URBANA, ILLINOIS, U, S, Ay 
PREFACE vii 
of the rarer species and varieties in different parts 
of the kingdom, and, in many cases, for the gift 
or loan of specimens. 
I desire also to acknowledge the kind help of 
the officials of the British Museum and of the Irish 
National Museum in granting me every facility for 
examining specimens in these national collections. 
BoWak. SLADEN: 
RIPPLE, DOVER, 
Feb. 5, 1912. 
