iv PREFACE. 



myself at liberty to work at any other family at the same time, I have adopted 

 the comprehensive title of this work. * 



I must not conclude this Preface without expressing the great obligation I 

 feel to those friends who have so generously aided me during its progress — to 

 Dr. Gray of the British Museum, to Dr. Boisduval, Mr. A. R. Wallace, and 

 Professor Westwood. 



W. C. HEWITSON. 



Oatlands, 



April 24, 1863. 



