40 TEPHROSIA EXTERSARIA. 
middle of the dorsal .area forms a broad yellowish 
stripe, enclosing the fine, dark green medio-dorsal line; 
the purplish subdorsal stripes have become broken 
into large, irregular, dark sienna-brown patches, which 
on the dark green ground colour are very conspicuous ; 
these dark patches are most dense on the front and 
posterior segments; the ridge on the ninth segment 
is also of this dark colour ; head now almost uniformly 
ereen ; spiracles dark sienna-brown, with pale centres. 
Ventral surface of the same green as the dorsal area, 
but numerously spotted with dark sienna-brown ; pro- 
legs also green, with the outside of the front pair 
purple; anterior legs green, marked with brown. 
By August loth, many of the larvae were becoming 
full-fed, though some of them were still not half-grown. 
The adult larva is about an inch and a half long, 
and of fair bulk, inclining, however, more to slender- 
ness than obesity. Head rounded at the sides, rather 
flattened in front, a little narrower than the second, 
and still narrower than the third and fourth segments, 
which, with the tenth, eleventh, and twelfth, are rather 
swollen; the remaining segments are of nearly uniform 
width, allowance being made for tly overlapping at 
the divisions ; there is a raised transverse hump on 
the ninth segment, and a smaller transverse ridge on 
the sixth segment. 
‘There are two very distinct types of colouring: 
In Var. 1, which is the more numerous, the ground - 
is pale pea-green, the head and the dorsal area at the 
segmental divisions strongly tinged with yellow; the 
lower part of each lobe spotted with black; the 
alimentary canal shows through as a very narrow and 
interrupted dorsal line; a purplish-brown patch, 
marbled with white (this white forming two distinct 
spots on each of the middle segments), on the posterior 
half of each segment, except the twelfth and thirteenth, 
and extending from the subdorsal to the spiracular 
regions, take the place of the subdorsal and spiracular 
stripes; the hump on the ninth segment is dark 
