232 
LYCAENIDAE 
distinctly edged with pale crescents. The hind wing is usually 
dusted with blue over the base and has an outer marginal 
row of deep orange crescents and black spots edged outwardly 
with whitish, not blue as in the Adonis Blue. The fringes are 
dull white, or buffish, checkered with brown. ( Under Side.) 
This is cinnamon-brown, ashy-grey over the central area, other¬ 
wise similar to that of the male, but usually the spots are larger. 
Life of Imago. L. coridon probably lives as an imago 
between twenty and thirty days. 
Aberration. L. coridon is liable to very considerable 
aberration in the ground colour of both surfaces of the wings 
and in the spotting of the under side, in both sexes. To 
enumerate all the named aberrations would be unnecessary, 
as every gradation in the development of the markings exists 
between the extreme forms, therefore allusion to the following 
more striking phases of aberration will suffice. The males 
vary both in the tint of blue and in the width and intensity 
of the black borders, as well as in the whitish markings in 
the borders, from a few specks to the whole of the black being 
replaced by white in both fore and hind wings ; this constant 
and somewhat rare form is known as ab. fowleri, it occurs in 
both sexes, and is more frequent in Dorset than elsewhere. 
The females vary in the amount of blue suffusion over the 
wings, a not very uncommon form has the basal half of the 
fore wings and the whole of the hind wings blue, ab. semi- 
syngrapha, while the rarer extreme form has all the wings 
entirely blue up to the marginal borders = ab. syngrapha ; 
this aberration occurs chiefly in Wiltshire. Between this 
extreme phase and normal specimens, every gradation of 
blue suffusion exists. Another extreme type of colouring 
that occasionally occurs is one having the whole of the upper 
side of a pale ochreous-buff = ab. ochracea n. sp. In very 
rare cases asymmetrical specimens are met with, being of 
two distinct forms in the same individual, as the female 
figured (12) in Plate XIX, facing page 20S. This female I 
captured at Purley, Surrey, in 1917. The upper surface is 
that of a normal female on both sides, but the under surface 
is of two distinct forms of the female ; the right side (under 
surface view) is typically female ; the left side is the large 
light type. Among well-known aberrations are: ab. obsoleta , 
