THE CHALKHILL BLUE 
231 
inclining to amber on the head and greenish on the thorax ; 
and olive-yellow on the abdomen. The whole surface is 
covered with fine rust-brown reticulations, and is sprinkled 
with brown warts, each emitting a short, whitish hair. It 
is also densely studded with minute truncated tubercles 
along the spiracular region and thorax ; down the centre 
of the abdomen is a brownish streak. The pupal state lasts 
about thirty days. 
Imago. The sexual differ¬ 
ence is very distinct. The 
average expanse of the wings 
is 38 mm. 
Male. {Upper Side.) The 
ground colour is a very pale, 
lustrous, silvery-blue, usu¬ 
ally with a very faint green¬ 
ish tinge ; the basal half of 
the wings is clothed with long, 
silvery, plumose scales ; the 
outer marginal band and end 
of the nervures are black. 
The hind wing has a sub¬ 
marginal series of black spots 
outwardly edged with white 
and with the margin outlined 
with black ; the costal mar¬ 
gin and outer angle is broadly 
black. The fringes are white 
and flecked with black con- The . C halkhill Blue at rest. Sketched 
tinuous with the nervures. from life. 
The eyes are hairy. 
Male. (Under Side.) The fore wing is ashy-white, with 
nine white-ringed black spots and sub-marginal rows of dusky 
spots and lunules. The hind wing is brownish-buff, shading 
into pale greenish-blue at the base, and has about twelve 
white-ringed black spots and a sub-marginal series of white, 
orange, and black markings. 
Female. (Upper Side.) This is fuscous-brown ; the 
discoidal spot is black and usually finely-outlined with whitish. 
There is an outer sub-marginal series of black spots in- 
