416 Dr. T. A. Chapman Contribution to 



gathered from the three specimens, get greener as they grow, 

 very decidedly more than mere spreading of the dark hair 

 bases would cause, probably due to ingestion of fresh food. 



April 4th. — No. 3 looks dark and small and has not yet 

 begun feeding after moult. No. 2 still feeding, length 

 7*3 mm. No. 1, apparently laid up for moult (4th and last), 

 is barely 7 mm. long, but thickened up to 2 mm., fairly 

 uniform in width to 6th abdominal segment, width and 

 height nearly equal, tapers a little after 6th. Colour un- 

 changed, yellow lateral line, pale dorsal flange lines, and 

 oblique lines chiefly marked by the darker shade between 

 them at mid-slope ; this shade is divided on each segment 

 into an anterior and a posterior patch. 



On entering 4th instar. No. 3 as an example is 4-3 mm. 

 long, of a warm (or reddish) grey, not at all green, with 

 lighter dorsal flange line and mid-slope line, and a narrower 

 and rather oblique one between these. In the wide inter- 

 space between mid-slope and lateral (hardly yellow) lines 

 is onlv a central small pale shade, the rest ground-colour. 

 It very much, in fact, resembles the third-stage larva, but as 

 it grows takes on quite a green coloration. These several 

 aspects are shown on PI. LXXXIII, figs. 5, 6, 7. The 

 figures might give the impression that the larva is as green 

 in the 3rd as in the 4th instar ; it may be in some instances, 

 but as a rule the larvae are generally -without much green 

 in 3rd instar, and all are green when well grown in the 4th. 

 The skin structures are shown on PI. XCIII, with some 

 details on PI. XCIV. 



April 9th. — No. 1 has moulted into 5th (last) instar this 

 morning; it is now an especially green larva, the yellow 

 lateral line is really yellow, but is the only portion (head and 

 legs, of course, excepted) that is not merely some shade 

 or variant of green. The dorsal ridges (flanges) are a paler 

 yellowish green, the dorsal trough darker. The slopes 

 show (on each segment) the darker oblique band between 

 the paler (yellowish) lines, and the spiracles are marked as 

 whitey yellow dots. The fans, or rather their sites, are also 

 seen as conspicuous whitish spots. Some of the dorsal 

 hairs are dark, but the majority nearly colourless ; the bases 

 are dark, but have little effect on the general tone of colour. 

 On touching the 5th and Gth abdominal segments, the fans 

 were everted and the head and front segments raised, show- 

 ing irritation rather than any pleased response as to ants. 



April 14th. — No. 2 moulted into last instar. 



