ADVERTISEMENT. 
The Synopsis of North American Butterflies which accompanied Volume I. 
was issued in 1872, and for various reasons, among them the imperfect knowl¬ 
edge of many of the species described and of their distribution, which I shared 
with the other lepidopterists of the country, it was much at fault. In 1876, I 
published in the Transactions of the American Entomological Society a Catalogue 
of the Diurnal Lepidoptera of America, north of Mexico, which was unquestion¬ 
ably an advance upon the Synopsis. In the intervening years many supposed 
species had been found to be synonymous, and many others to have been erro¬ 
neously credited to our fauna. Corrections were made accordingly. The ge¬ 
neric names were somewhat changed, and most of those in the Hesperidae dropped. 
A revised edition of the Catalogue has recently been printed in Volume XI. of 
the Transactions spoken of, 1884, with extended references, and in all respects 
as complete as I am able to make it. The present List follows the revised Cata¬ 
logue, and the numbers of the species in the two correspond. The List gives no 
synonyms, but simply the names of species and varieties. For information 
beyond that I refer to the Catalogue, which may be had separately on applica¬ 
tion to Mr. E. T. Cressox, Post-office Box 1577, Philadelphia, Pa. 
WM. H. EDWARDS. 
Coalburgh, W. Ya., November 1, 1884. 
