xvi PREFACE. 



drawn by his own hand to illustrate his descriptions 

 of new or remarkable insects. 



Of those gentlemen, moreover, who have contri- 

 buted their professional assistance, I must also in 

 common gratitude add a word. Mr. Francis Holl has 

 bestowed much pains on the production of a portrait 

 of my late brother, from a photograph by Messrs. 

 W. T. and R. Gowland of York, which I believe 

 to be very successful ; Mr. Kaufmann's chromo-litho- 

 graphs are the result of much careful effort on his 

 part to catch the spirit and preserve the effect of 

 the original water-colour drawings from which they 

 have been taken ; the lithographs in the Appendix, 

 drawn respectively by Messrs. J. G. Keulemans, 

 R. Mintern, W. H. Fitch, and (as already men- 

 tioned) Professor Westwood, have been accurately 

 rendered by the skilful hands of Messrs. M. and N. 

 Hanhart, and Messrs. Mintern Brothers ; and the 

 wood -engravings have been ably and conscien- 

 tiously executed by Messrs. G. Pearson, J. D. 

 Cooper, and E. Evans, all of them with a faithful 

 determination to do the fullest justice to their re- 

 spective subjects, and I believe with admirable result. 

 The birds and animals have been placed on wood 

 chiefly by Mr. Smit, and some by Mr. Davenport ; 

 whilst Mr. Charles Whymper has contributed two 

 original drawings of the author's dogs and the 

 designs upon the cover ; the maps which accompany 



