150 iw +. A. Chapman on the 
In measuring from preserved specimens, the measure- 
ments are as close to the proportional series as one could 
reasonably expect. 
Already in the first stage the larva, when somewhat 
grown, has a colouring approaching that of the full-grown 
larva, and in the third stage they are, so far as my few 
specimens indicate, quite like the full-grown larva; the 
panoply of hairs, lenticles, etc., becomes more abundant 
with each moult. A full description of these would be very 
lengthy, and not convey as good an idea of the facts as a 
few glances at the photographs of the larval skins of each 
stage presented herewith. The most notable peculiarity 
of the larva in the first instar is the marked development 
of the hair of tubercle III. In most Blues III appears to be 
represented by two very minute hairs, those that approach 
very near to orbitulus as regards this hair are astrarche 
and minimus, the latter not a Plebeiid; in these there 
seems to be a definite IIJ, with or without a minute hair 
point, making up the two that are nearly always present. 
I may quote my description taken from the living, full- 
grown larva, though this is hardly necessary, with Mr. 
Knight's excellent figures to refer to. 
“Tt is of a bright, but rather bl uish-green (assuming this to be the 
ground-colour), with a brown dorsal stripe bordered on each side 
with white, and on the middle of each segment by pink. On the 
‘slope’ of each segment, centrally, is a short dark line or patch, 
obliquely placed, occupying the hollow above the spiracle. The 
obliquity is downwards and backwards, it is conspicuous on the 3rd 
thoracic and first 6 abdominal segments, but exists before and behind 
this, in most specimens somewhat obscurely. 
“ The lateral line along the flange is white, margined above by pink 
or pinkish-brown, more or less bright in different specimens, which 
graduates into the green slope below the spiracles. Below the white 
band is a darker border, shading into the dull olive-green of the 
underside. The spiracles are small black points. In one speci- 
men, the oblique dark lines on the slope are much extended, and the 
colour bordering the dorsal and lateral lines is very broad, so that 
the green ground-colour is very restricted; this specimen is young in 
last skin and may become more normal later, but cannot wholly do 
so (by comparison with fairly normal younger specimens). 
“The surface is everywhere furnished with black hair points, not 
very closely placed, and from these short black hairs arise, though 
without a lens one is inclined to regard the larva as quite smooth, 
