( exlvii ) 
sometimes evenly rounded, is more frequently slightly un- 
even. The special scale I would draw attention to however 
is a tubular hair-like one that is blue in colour, it is very 
long, though the length is not uniform, with the base quite 
as wide as the apex; the base is colourless, apparently quite 
empty, for the proximal eighth the tube tapers down more 
narrowly, and in the second narrow eighth the first vestiges 
of colour appear, it then assumes its usual width and termin- 
ates in a very bluntly rounded apex, it is really a hair-like 
scale though coloured, being perhaps three times the width 
of the very fine and longer basal hair-like pattern obtaining 
almost throughout the group. The “ blasenschuppen”’ are 
ovate, broader than in icarus with seven rows of reticulations 
usually, though I have counted as few as six and as many 
as ten. 
P. eros shows a yet further advance in the simplification 
of the blue scales—omitting those composing the costal cable, 
which in all cases is composed of special ones more or less 
similar, it being obviously necessary for the costa of the 
primaries to be particularly strong; they are of slightly varying 
sizes and widths in the different areas but are all more or 
less of the same pattern, being of moderate length, narrower 
at the base and tapering somewhat broadly up to the apex 
which is evenly terminated in a slight arch. The thick hair- 
like scales as described in thetis are present in some numbers, 
whilst the “‘ blasenschuppen” are very numerous and of 
the typical icarus pattern; they are a long narrow oval shape 
with a long attachment peduncle and have four or five rows 
of reticulations; they are colourless, the reticulations appear- 
ing greyish, but under a condensed direct light they are 
brownish; they are then however so very obscure that an 
inexperienced eye would probably fail to see them. 
Plebeius anteros possesses ‘“ blasenschuppen”’ of unusual 
size and interest whilst the ordinary blue scales are quite 
simple and for the size of the insect large; they are oblong, 
longish, rather broad, tapering very slightly indeed up to 
near the apex, from whence they reduce equally slightly to 
the apex which is very weakly curved, without any wave or 
serration; they are finely ribbed. The “ blasenschuppen ” 
