MR. J, WATSON ON THE PLUMULES OF LEPIDOPTERA. 259 



consumption and for exportation; wherefore it seemed 

 proper briefly to record the names of the parties from 

 whose joint labours have sprung this important and suc- 

 cessful branch of manufacturing industry and trade. 



XVIII. Further Remarks on the Plumules or Battledore 

 Scales of some of the Lepidoptera, with Illustrations by 

 Mr. J. SiDEBOTHAM. By John Watson, Esq. 



[Eead before the Microscopical Section, March 25th, 1867.] 



Having on two former occasions drawn attention to cer- 

 tain peculiar scales belonging to the Rhapalocera division 

 of the Lepidoptera, as serving in some degree for generic 

 or specific classification, and having then limited my re- 

 marks to the Pieridae and Lycsenidse, I now beg to state 

 the result of observations made in other families. 



In conjunction with my friend Mr. Sidebotham a com- 

 plete treatise is in preparation, embracing the whole sub- 

 ject of these plumules ; it is to be illustrated with several 

 hundreds of figures; but the completion of the large 

 number of plates necessary will occupy considerable time. 

 The figures will be arranged in generic groups of all the 

 species (or so-called species) which can be obtained, so 

 that observers may judge whether or not the plumules of 

 some differently named species are identical. 



In the first place, referring to the genus Pieris, already 

 treated of, I desire to draw attention to a small group of 

 species placed at the beginning of the genus, which display 

 no plumules. There are four species, viz. Thestylis, an 

 unnamed neighbour, Clemanthe, and Autothishe : we have 

 before seen that the plumules are the possession of the 

 males only ; now, while deficient in this peculiarity, these 

 species have another of their own, viz. a strongly marked 



