﻿iv Preface. 



point it may become harmful by the inadequacy of its natural food, 

 leading it to direct its attention to other kinds of food, and thus to 

 become injurious to Agriculture. 



The specimens shown in the Exhibition-case were kindly 

 presented by the Trustees of the late James Eowland Ward. 

 The Plates which illustrate this work are reproduced from 

 originals drawn for the purpose by Mr. Frohawk. Valuable 

 suggestions have been made, during the progress of the work, by 

 Lord Eothschild, F.B.S., the Eight Hon. J. W. Lowther, D.C.L., 

 LL.D., Speaker of the House of Commons, Mr. B. G. B. Meade- 

 Waldo, Mr. J. C. F. Fryer, of the Board of Agriculture and 

 Fisheries, and Mr. G. E. Fagan, I.S.O., who first suggested the 

 preparation of the exhibit. The thanks of the Trustees are due 

 to these and to others who have assisted in the preparation of 

 the work. 



SIDNEY F. HAEMEE, 



Keeper of Zoology. 



British Museum (Natural History), 



Cromwell Road, London, S.W. 7. 



February 15, 1919. 



