THERETRA PORCELLUS. 99 



Amorphids, they rise from small conical tubercles of usual shagreen type, 

 whitish or yellowish-white in colour, less marked on the clear green 

 border to the subdorsal stripe ; subsegments clear and distinct, 6 on each 

 abdominal segment, the first equal in size to any three of the 

 others, and, as before noted, structurally equal to three, thus 

 giving 8, the normal number of subsegments in Sphingid larvae ; 

 apparently 6 also on the mesothorax and metathorax but they 

 are all equal in size and rather larger than the small abdominal 

 ones ; the shagreen-hairs are rather thick and short, not bifid, but 

 apparently glandular in character; what looks like minute drops 

 of a yellowish substance can be made out on some of the hairs. 

 ? Third instar (August 4th 1898) : No change in general character 

 from last instar. Grows to 75m. in this stage. Head paler green 

 than the body, and, when the larva is fullgrown in this stage fas 

 also when adult), is very small compared with the size of the 

 body. The broad white subdorsal body-stripe clear and strong, 

 turning up to the root of the caudal horn as in the larva of Sesia 

 stellatarutn ; the mediodorsal line clear ; the bases of the shagreen 

 tubercles white, the white spreading somewhat from base ; the 

 subdorsal band much whiter on the 1st and 2nd abdominal seg- 

 ments than elsewhere, swelling out into a distinct spot on each of 

 these segments (much larger on the 1st than the 2nd abdominal); on 

 the 1st abdominal segment a dark spot of reddish or purplish hue 

 just below the white spot or swelling of the band ; this dark spot 

 bordered below with whitish ; on the 2nd abdominal only the 

 faintest trace of a dark spot ; anal flap narrowly bordered with 

 white. ? Fourth instar (August 7th, 1898) : The subdorsal band much 

 less prominent, that portion on thoracic segments the strongest ; 

 colour of larva still green ; faint oblique (tail to head 

 slope) stripes discernible ; the caudal horn still repre- 

 sented by a central, dorsal, pale-coloured tubercle, its double 

 character easily made out from the two short shagreen-hairs that 

 surmount it, the white from the bases of these hairs divided centrally 

 by a narrow green streak ; spiracles large, oval, surrounded by a 

 narrow, chitinous rim; shagreen-hairs very short, more numerous 

 than in previous instar, and white specks at their bases more con- 

 spicuous ; green of lateral area rather whiter than on dorsal area ; 

 the swelling of the subdorsal band on 2nd abdominal segment has 

 now developed into a circular creamy-white spot, bordered above 

 and below by a dark streak; that on the 1st abdominal is much 

 larger ; it consists of an oval, creamy-white spot (quite twice the 

 size of that on 2nd abdominal), bordered above by a narrow black 

 streak and a rather suffused but broader reddish band ; below 

 the white is a band of dull red, broader in centre and narrower 

 at ends ; this fades into flesh-colour below, this tint forming a 

 tolerably broad spot, thinning out posteriorly into a narrow streak ; 

 below this again is an intense velvety-black spot, of irregular 

 lunular shape, broader in front than at back, the whole forming 

 a distinct ocellated spot. The ocellated spots show up more 

 clearly in this stage, partly because they are stronger and the 

 colour contrast greater, and partly because the subdorsal bands 

 are fainter than before. Dark, smoky-coloured larvae are sometimes 

 met with in this stage. ? Fifth instar (adult) : All my larvse are 



