BY E. MEYRICK. 141 



of the larvse feed internally in flower-heads, fruits, stems, or 

 roots. 



Owing to the difficulty of the subject, insufficient material, 

 and the bad condition of many of Walker's types in the British 

 Museum, I now find that in my former paper I wrongly identified 

 some of Walker's species. For the purpose of the present paper 

 I carried up my whole material to the British Museum, and made 

 a close comparison with Walker's types, and believe that I have 

 now identihed every one of these satisfactorily. The synonymy 

 given in this paper should, therefore, be taken as correcting and 

 superseding that given formerly. 



I have also modified my conceptions of certain genera; in 

 particular, I have discarded the presence or absence of a costal 

 fold in the ^ as & distinctive character, finding that it tended to 

 separate forms otherwise closely related and more naturally 

 placed together, whilst intermediate species occurred in which 

 the fold was in such a rudimentary condition that they might 

 equally well be placed in either class. I consider also that the 

 costal fold and its contained hair-pencil can only be regarded as 

 a particular example of a class of structures which, being 

 intended for sexual recognition and excitement, are essentially 

 specific and not generic in character; and I hold, therefore, that 

 similar tufts and folds occurring in other positions (such as the 

 dorsum of hind wings) are equally unfitted for use as generic 

 distinctions. I do not, however, apply this to other secondary 

 sexual characters, which are not concerned with specific dis- 

 crimination, such as the structure of the antennae in the male- 

 the ciliations of these, for example, are evidently necessary to 

 the male and not to the female, and there can be little doubt 

 that by means of them the male apprehends the female, but 

 there is no reason to doubt also that if the male of one species of 

 Capua could be equipped with the antennse of another species, 

 they would serve him equally well, whilst the costal hair-pencil 

 of another species would emit a wrong scent, and would there- 

 fore not serve him at all. It will be observed, however, that in 

 some genera, as now limited, the costal fold is as a matter of fact 



