INTRODUCTION. Vl 
belonging to the United States National Museum have been included in the present 
enumeration. To that gentleman also we are indebted for a set of all the N.-American 
forms that they had in duplicate, these having been supplemented by many others 
kindly supplied by Colonel Casey and Mr. H. F. Wickham. The late Professor P. 
Biolley, too, up to within a short time of his death, frequently forwarded to us 
interesting Costa Rican forms, often with notes as to food-plants, &c. 
The system of publication here adopted, the only one possible by which any rapid 
progress could be made and the plates prepared at the same time, has prevented me 
from tabulating the genera of such a large group as the Barina; it would, however, 
have been of little use, unless the vast number of Tropical South American forms had 
been studied also, a task beyond the scope of this work. 
Altogether 908 species are enumerated in the present volume (620 of which belong 
to the Barina, and 30 only to the Ceuthorrhynchina), 717 of them being treated as 
new, with 81 new genera. The twenty-three Plates issued, all of which have been 
drawn and lithographed by Mr. E. Wilson, of Cambridge, are wholly or partially 
coloured. 
G. C. C. 
April 1909. 
