BATTLEDORE SCALES OF LEPIDOPTERA. 263 



Family I. Papilionid^e. — No plumules found. 



Family II. PiERiDiE. — Found on many species already 

 mentioned. 



Family III. Ageroniid^. — None. 



Family IV. Danaid^. — It is in tlie genus Euplcea 

 only of this family that plumules have been found; 

 and they bear a very different form from that of those 

 of other genera^ with the exception of an approach in 

 Pieris Lycimnia, PI. V. fig. 6 a*. The typical form of 

 Euploea is shown in PI. V. figs, i and 2; and I have 

 found them on 13 species^ whether or not all distinct 

 may be questioned^ but there can be no doubt about 

 the two in the plate. When the plates containing all 

 the figures are ready^ their similarities and differences 

 will be apparent. It is to my friend Mr. Labrey's in- 

 dustry and information that I owe a knowledge of these 

 plumules. I had often examined the insects unsuccessfully : 

 and it well might be so ; for these scales are not found in 

 the ordinary places, but, as I believe, only in the upper 

 part of the secondary wings, where overlapped by the pri- 

 mary and fringing the light-coloured patch on the inferior 

 wings ; here they exist in Euplcea Midamus in large and 

 compact masses, presenting an appearance similar to a 

 bed of bulrushes at the edge of a marshy lake. I cannot 

 doubt that further search in this genus will be rewarded 

 with valuable evidence as to the identity or difference of 

 many species. 



Family V. Heliconiid^. — Here I have been able to find 

 plumules in the genus Heliconia only, but in 26 species. 

 They are of singular interest in our view of their use for 

 classification and for the determination of species. (In 

 illustration of the following remarks I produce specimens 

 of the insects to which reference is made.) 



* The plates have been drawn by Mr. Sidebotham, specially for the illus- 

 tration of this paper. 



