( xxii ) 
the females this is much less marked. The males are al¬ 
together darker than the females. One or two males are 
very dark, one or two of the females rather light. One or 
two females have a distinctly darker margin just within the 
fringe, with a paler one just within it. 
The male androconial brands vary from nearly black to a 
pale reddish not far from the ground-colour. In not a few 
specimens they look almost white, and this was noticed to be 
the case in several specimens almost immediately on emergence. 
In some of these with white brands, the colour is white when 
looked at from one angle, dark from another, and often one 
brand looks dark, the other white, reversing when seen from 
another angle. The effect seems to be due to a variation in 
the degree to which the scales are erect on the wing, so that 
in some lights, not the true scale colours, but only reflected 
light from their sui'faces is seen. The ordinary scales lie very 
flat, the androconia are raised at a considerable angle, and are 
twisted so that often portions of the scales are almost at right 
angles to the wing surface. 
In the underside there is also some variation. Some are 
of a fairly deep-blue-green, in others, and this is more frequent 
in the females, there is quite a brownish tone in the green, 
and in one or two specimens the brown is very evident 
towards the fringes and along the nervures of the anterior 
wings; there is also an extension in a considerable proportion 
of specimens of the brownish-grey area of the forewing where 
the hind wing covers it. There are variations precisely parallel 
to all these in C. ruhi. 
The white line is less variable than in C. ruhi, but this is 
very possibly due to all the C. avis being from one locality, 
the C. ruhi I have from very numerous ones. 
In only one or two is the line obsolete on the forewing, in 
no specimen on the hindwing. 
On the hindwing it is frequently obsolete or nearly so on 
the inner half of the wing. The position (nearer the base) 
and character of the markings is very different from C. ruhi 
in all examples. 
The individual elements of the white line, i. e. the portion in 
each interneural space, are not more or less square, but dis- 
