PREFAC E. 



The object of this Work is to facilitate the study of Lepidoptera Heterocera by 

 giving illustrations, accompanied by short diagnoses, of the typical specimens 

 in the British Museum from which species have been described in other works 

 or are described now for the first time. A strictly systematic arrangement of 

 the species illustrated can be followed only within the limits of the several 

 parts of the work. 



The first thirteen plates of this part were executed and printed many years 

 ago, to illustrate a catalogue of a much wider scope than that of the present 

 work, which will account for discrepancies between names used in the plates 

 and those adopted in the text, the nomenclature having in many instances been 

 changed since that time. This could not be altered ; but no inconvenience will 

 be caused thereby, as in every instance an explanation is given, not only in the 

 synonymy, but also in the index. 



The descriptions of this first part have been prepared by Mr. A. G. Butler, 

 E.L.S., one of the Senior Assistants in the Department of Zoology. 



ALBEET GUNTHER, 

 Keeper of the Department of Zoology. 



British Museum, February 16, 1877- 



