x INTRODUCTION. 
made a list of the Heterocera recorded from Central America, and the number of 
species was then considerably under 400. 
The arrangement followed is mostly that of Guenée and Walker, that of the 
Sphingide being in accordance with Dr. Butler's Monograph. 
The immense amount of material examined has been contributed as follows :—From 
Mexico, by Messrs. Becker, Boucard, Elwes, Flohr, Gaumer, Godinan, Hoge, Morrison, 
Riimeli, H. H. Smith, and Trujillo: Morrison’s specimens were entirely from the 
northern border, those of Becker from Durango, and those of Gaumer from Yucatan. 
From British Honduras, by Sir Alfred Moloney, and Messrs. Blancaneaux and Whitely. 
From Guatemala, by Messrs. Champion, Conradt (through Dr. Staudinger), and 
Rodriguez. From Nicaragua, by Messrs. Belt and Richardson. From Costa Rica, by 
Messrs. Rogers, Underwood, and Van Patten. From Panama, by Messrs. Arcé, 
Champion, Ribbe, Salvin, and J. J. Walker. 
In addition to the specimens received from these collectors, Mr. Schaus has been 
good enough to place nearly the whole of his very extensive series of Mexican 
Heterocera at my disposal, and Dr. Staudinger has lent us from time to time the 
numerous insects collected for him in Chiriqui by E. Trétsch. 
My best thanks are due to the Editors for their great assistance in procuring so 
many collections for the purposes of this work, which has occupied a large part of my 
leisure time during the past twenty years. 
March 1900. 
