540 Notes in 1887 upon lepidopterous larve, ce. 
The difference between the 6th and the other larve 
decreased, and that between the 2nd and the others 
increased subsequently, for the dark colour becomes 
rather less deep during growth. ‘The real line of 
demarcation was, however, between the Ist larva and all 
the rest; this great difference dwarfed all the minor 
differences between the latter. 
The horn in this stage is slightly curved, and 
possesses the shape shown in Plate XVL., figs. 1—5. It 
will be noticed that the curve is now the reverse of that 
seen in the 1st stage. The surface is shining, although 
still rough, with comparatively small tubercles, which 
represent the far larger thorns present in the two previous 
stages. The colour is black, with a dark reddish brown 
patch on each side of the base, especially bright in 
the green variety (1), and hardly present at all in the 
case of (4) and (5). There was a very faint trace of the 
light transparent zone on the horns of (1), (8), and (4). 
The tip was slightly but distinctly bifid in all except (4) 
and (5). 
The spiracles were bright orange and extremely con- 
spicuous in all the larve. 
II. The four intermediate larve of the 8rd stage.— 
These larve were of very uniform size on Oct. 8th, 
being about 30 mm. long. 
_ (1). This larva was a green variety, but not so bright 
or with so much of the green colour as (1) of the 
previous division. There wasrather less green on the head 
and much less along the median dorsal line. The green 
was duller and less yellowish in tint. The dark borders 
were much wider, and were of considerable breadth at 
the point where they became continuous with the black 
dorsal band; whereas these two dark markings were 
almost discontinuous in (1) of the previous division, thus 
nearly allowing the subdorsal line to pass between them. 
The transparent zone on the horn was slightly marked ; 
there was hardly any of the reddish brown colour at the 
base. This larva was carefully re-examined on Oct. 11th, 
when nearly mature in this stage, and was again 
compared with the lightest of the previous lot (shewn in 
Plate XVI., fig. 1); the larva formed a beautiful but 
gradual transition from the latter in the direction of the 
darker larve. All the points in the comparison made 
above continued to hold at this later date. It was also 
