106 Dr. H. Eltringham on Specific and 



is much less different from that of ethilla metalilis than the 

 latter is from some other forms of ethilla. 



We thus see that on the structure of the genitalia we 

 cannot satisfactorily distinguish between narcaea, numatus, 

 ethilla, and gradatus and most of their forms. 



We now turn to a large group containing ten reputed 

 species and their forms. They all have at least this feature 

 in common, that there occurs near the end of the clasper 

 a tuft of bristles sufficiently evident to distinguish them 

 from those of the narcaea group. 



H. novatus, Bates. 



The claspers of the three principal forms are shown on 

 Pis. XIII, XIV, and present a closer agreement than any 

 we have so far examined. The forms are found in Peru 

 and Bolivia. Mr. Kaye informs me that schultzei, PvifE., is 

 merely the female of novatus. 



H. hecale, Fab. 



This large black form with a conspicuous white patch 

 on the fore- wing occurs in Dutch and British Guiana. 

 The clasper is shown on PI. XIV, and differs in scarcely 

 any respect but that of size from those of the last and next 

 species. There is a form named fidvescens, Lathy, from 

 Demerara, in which there is a brown basal suffusion in 

 the fore-wing. 



H. aristiona, Hew. 



Of this species some twelve subspecies and several forms 

 have been named, ranging through the Amazon region, 

 Peru, Ecuador and Bolivia. I have shown the claspers 

 of seven forms on PI. XIV, and here again there is consider- 

 able general agreement accompanied by a certain variation 

 in actual outline. 



H. ithaka, Feld. 



The typical form and two subspecies are all found in 

 Colombia. It would be difficult to distinguish between the 

 clasper shown on PI. XIV and that of some of the forms 

 of aristiona. 



H. pardalinus, Bates. 



The type form and four subspecies range through N. 

 Brazil, Peru, Bolivia and probably Ecuador. The clasper 



