( emer .) 
silvery lustrous blue in the median and lower radial 
areas; under transmitted light the deep blue becomes 
deep lemon, the graduated shades become orange, 
whilst the pale silvery blue becomes pinkish buff, 
several quite pinkish scales being present. The 
upper ribbed surface having been removed left a 
closely granulated pink surface, the colour being the 
same both with the orange and pinkish buff scales. 
On to this pink granulated interior I condensed a 
very white light, but it merely intensified the pink 
hue, whilst the same result was produced by con- 
densing sunlight on to them. I therefore removed 
from other scales the lower surface of the sack, 
leaving behind only the ribbed upper chitine, no 
granules at all were present, the ribs being almost 
transparent very slightly yellowish. 
Arhopala hercules is a rich, metallic, deep purplish blue, 
entirely uniform in colour all over the wing. Under 
transmitted light it is clear lemon yellow. With 
the upper ribbed chitine removed the same clear 
yellow is maintained, the surface being granulated 
exceedingly finely. The base of the scale was almost 
colourless but became rapidly coloured beyond the 
proximal end. 
Arrhenothryx penicilligera is a beautiful pale blue, becoming 
clear transparent lemon under transmitted light; 
with the upper wall removed the interior is densely 
and finely granulated with minute lemon-coloured 
granules, whilst the white hair-like sexual tufts are 
greyish with transmitted light. 
Thecla orgia, with its lustrous sky blue, becomes deep straw 
colour. 
T. polybetes is brilliant metallic blue, but becomes under 
transmitted light deep bronzy straw colour. 
T. phaleros is bright metallic blue and also becomes bronzy 
straw colour. 
Most of the South American metallic blues are under trans- 
_ mitted light of a bronzy hue so far as my observations go. 
Ruralis duma is lustrous metallic green inclining to yellow 
