PREFACE 



Vll 



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. 



F. W. L. SLADEN. 



Ripple, Dover, 



Feb. 5, 191 2. 



