xiv Notes to Introduction. 
in xylol balsam, the preparation being made as flat as possible. 
Exactly the same applies to the palpi as to the wings, for the 
number of joints cannot be made out from a museum specimen, 
the articulations being obliterated by scales. The scales have 
to be removed and the palpi mounted in balsam before the 
number of joints can be ascertained. There are often notches 
in the palpi, which may be rudimentary or degenerating joints, 
but which are certainly not existing articulations. These often 
appear as such, however, in specimens in which the palpi are 
covered with scales. 
