viii PREFACE. 



whilst chromolithography is better suited for reproducing sharply- 

 defined bright colours : some allowance will doubtless have to be 

 made for the figures of the American species that have been reproduced 

 from coloured photographs ; when this is the case, it will always be 

 found stated in the text. 



E. lUY LANKESTEK, 



Director. 

 British Museum (Naturai History), 

 June 20th, 1903. 



