(¢ exlii ) 
Plebeius argus, L. (aegon Auct.). 
The costa is composed of a gradually tapering cable of long 
flattish scales that slowly taper distally and terminate generally 
in a sharply bifid extremity, though there are many with a 
trifid extremity among them, these scales are arranged in a 
heavy continuous bundle near the base, becoming gradually 
narrower and fewer up to the apex, the scales are without 
doubt a modification of those that form the fringe on the 
termen with which they eventually merge at the apex, they 
are at the base brownish but soon become white on the outer 
edge of the costa; between this and the costal vein the area 
is filled with blue scales not half the length of those just 
mentioned; they appear to be flat, but of course are not so, 
and are broad, tapering very slightly to the extremity, their 
bases are indented, a short fine stalk issuing from the inden- 
tation, whilst their apices have three equidistant incisions 
giving them a quadrifoliate (if I may use the term) termina- 
tion, with these, nearer the termen, we find a few of another 
bluish scale like the costal ones but shorter and wider (though 
much longer than the ordinary scale just described) with a 
deeply and sharply quadrifid apex. The veins are all clothed 
with a combination of two or three different scales, and are 
always I believe brown, this being the case with the great 
majority of species examined. One other pattern is like that 
mentioned, but not so long and broader, another is similar 
but broader still and with four or five deepish serrations at 
the apex, whilst the third is a short very broad scale with a 
bluntly quinquedentate apex. Between the costal vein and 
the cell, as also in the subcostal area above vein 7, the same 
pattern scales prevail as are found in the costal area, but 
those in the cell itself are different, they are much broader 
with no serrated extremities (though the basal attachment 
remains practically the same in all) but instead a quinque- 
foliate apex in many, though the majority of the scales in 
this area, for there are two sorts, have an even, very slightly 
undulated apex; the pattern on the fold is a still further 
modification, for whilst retaining the same size and shape as 
the scales in the cell, they have mostly assumed a perfectly 
even, slightly convex apex, though a certain number with an 
inclination to a slight foliation appear among them; in the 
