TRPHROSIA EXTERSARIA. 39 
larva, hence only meagre notes had been made on the 
earliest stages. Fortunately the eges, which were 
dull dark green, did not all hatch together, so that, 
when I did find out the necessity of studying them 
closely, I was able to take notes on the larvze in various 
stages. By this time, August 5th, they varied from 
half an inch to an inch or a little over in length. 
Up to nearly three-quarters of an inch the colouring 
and marking are pretty much the same, and may be 
described as follows : 
- Body slender, cylindrical, and of almost uniform 
width throughout ; head rounded, but rather flat in 
front, fully as wide as the second segment; skin smooth 
and glossy, and the segmental divisions clearly defined. 
Ground colour bright pale green; the head yellowish- 
green in front, brown at the sides; the very fine 
medio-dorsal line, and the broad subdorsal stripes 
darker green; spiracles black. Ventral area and pro- 
legs bright green, the front pair of prolegs tipped 
with brown; anterior legs grey, ringed at intervals 
with brown. 
In the next stage, thatis, when about three-quarters 
of an inch has been attained, two small raised tubercles 
have appeared on the ninth segment; the ground 
colour has become a darker green, and the fine medio- 
dorsal line still darker green; the subdorsal stripes 
have become more or less purple, some specimens 
having very little of this colour, while in others it is the 
predominating colour of the stripes; the two tubercles 
on the ninth segment are purple in both pale and dark 
forms ; the segmental divisions are yellow or pink in 
different specimens ; the head is still yellowish-green, 
but has jiost a good deal of the brown at the sides. 
At the next moult an inch has been attained; the 
skin has now quite lost its glossy character, and has 
become rather rough in appearance; the two small 
tubercles on the ninth segment have swollen into a 
distinct transverse ridge ; the segments also slightly 
overlap each other. Ground colour bright green; the 
