() clxxarni .) 
transmitted light transparent clear deep lemon 
colour; the ribbed wall of the sack having been 
removed reveals a slightly granulated deposit that 
is very pale pinkish. The tubular hair-like scales 
are paler yellow than the others. 
P. eros is pinkish buff with some intermingling of yellowish 
buff under transmitted light, and these colours were 
scarcely changed by condensing direct light upon 
them; though usually blue reflections show them- 
selves if this be done whilst under transmitted light. 
P. anteros is pale silvery blue, but under transmitted light 
is pinkish. The colour of the “ blasenschuppen ”’ is 
not discernibly different from the ordinary blue scale 
under direct light, but is pale yellowish under trans- 
mitted light. 
P. damon becomes semitransparent dirty straw colour 
proximally, shading into mauve distally; in this 
species I removed the lower wall of the sack with 
the result that the upper ribbed wall appeared to be 
transparent and clear and was quite colourless; no 
granules could be found, so that probably pigment 
when present is in the lower portion of the scale 
sack. 
P. meleager, with its bright clear blue, becomes under trans- 
mitted light deepish straw colour, the blue hair-like 
scales being also of this colour. 
P. semiargus is a strong darkish blue, but under transmitted 
light the scales become unusually clear pale straw 
colour; with the upper ribbed wall removed a finely 
granulated surface is revealed whose colour is almost 
imperceptible. 
P. galathea is lemon yellow under transmitted light; with 
the upper wall removed, a coarsely granulated sur- 
face is disclosed, the granules being exceedingly pale 
yellowish. 
Celastrina argiolus under transmitted light is of the palest 
possible yellowish, practically the colour of the 
chitine itself. 
Lycaena arion becomes straw colour under transmitted 
