X PREFACE. 
Westwood's paper have been drawn by his own 
hand to ilkistrate his descriptions of new or re- 
markable 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 
Gowland of York, which I believe to be very 
successful ; Mr. Kaufmann's chromo - lithographs 
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 skilfully 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 
