95 
Di'. T. A, Chapman on CallofUrys avis. 
hairs also, except just at emergence. The youngest larvae are now 
(May 18th) somewhat grown and are of a pale brownish tint, consist¬ 
ing, however, of the effect of the sparse black hairs, with a skin in 
two colours. The black hairs are the long dorsal ones, the, nearly 
as long, lateral ones, are pale or colourless. 
Tlie ground-colour is a light ochreous yellow with a trace of green 
and the reddish-brown markings are a light or diluted maroon. 
The prothoracic plate is dark but not black, the anal plate darkly 
tinted but pale by comparison with the prothoracic plate. The 
reddish markings are a line down each side of the dorsum, not quite 
central to the dorsal flange but rather to its inner side, and slightly 
interrupted at the incisions. A similar subspiracular line, leaving 
the dark dots of the spiracles on a pale line or area above it. Above 
the spiracles a line or band broadest at the front margin of each 
segment, leaving another pale area between this and the subdorsal 
line, somewhat triangular on each segment, from being broadest at 
its posterior margin, complementarj- to the red line beneath it, and 
centrally in this pale area a triangular red mark, with its posterior 
margin not quite coincident with the posterior margin of the seg¬ 
ment. On dorsal view the prothorax often looks dark (pale Indian 
ink) from the black head retracted into it. The larva is of the 
usual onisciform shape, about 2 mm. long and 0'7 mm. broad, fairly 
equal in width, but perhaps slightly tapering backwards, the ends 
little more than semicircles. On end view, the lateral flanges are 
marked, but the dorsal ones are the rather sharp margins of a flat 
dorsal area. 
In the second instar the larva is at first reddish in general tone, 
about 3'5 mm. long. The ground-colour is a green slightly toned 
with yellowish brown, but the greater part of the surface is occupied 
by pale reddish brown, viz. two brown lines (or bands) on each side 
of the dorsal line (left of the yellowish green ground-colour) and 
just inside tubercles I and II. The broad brown flange line below 
the spiracles, along the prominent bosses of IV and V forming the 
flange. The spiracular level is of pale ground-colour, but above it 
is a darker area, higher on the front of each segment, leaving a pale 
area narrow in front and broader behind, above it containing a 
darker spot in its centre. 
As it grows in this instar it becomes wholly green, the change in 
size and colour being so remarkable that I had some difficulty in 
satisfying myself that an unobserved moult had not taken jjlace. The 
length reaches 4'5 to 5'0 mm. The previous markings are just 
indicated in darker green. The head is dark except the mouth 
parts and just above the labrum. 
In the third instar (in which were still a few on June 3rd) the 
