SESIA STELLATARUM. 1 1 



of larva), the former differing but slightly in size from the 

 numerous secondary shagreen hairs which now appear, and which 

 form so marked a feature of the larva ; these hairs are small black 

 bristles with a bifid tip, each placed on a raised bright yellow- 

 coloured mammillary base, the pigment spreading over the 

 skin surrounding the base of the tubercle and forming a distinct 

 spot. The hairs on the head are much more numerous than in the 

 last instar, and they also partake of the shagreen character except 

 that the hairs themselves are apparently simple and have no bifid 

 tip, whilst their bases are black as is also the skin area immediately 

 surrounding them ; the bases of hairs are also black on the scutellum 

 and anal plates. The larva is still cylindrical with a small head, 

 the body tapering scarcely at all or only very slightly ; the horn is more 

 slender, still of a deep purple-red colour, and carrying numerous 

 bristly bifid hairs ; the prothorax is now divided into 6 subsegments 

 as well as the scutellar area, the mesothorax has 7, the metathorax 

 and abdominal segments are each composed of 8, subsegments. The 

 colour of the larva is bright but deep green, although the yellow shagreen 

 spots modify it and give it a more glaucous tint, while the hairs 

 give it a brownish hue to the naked eye. A narrow mediodorsal 

 stripe is present, in part formed by the absence of shagreen spots 

 in its area, and a subdorsal yellowish stripe is formed by the 

 shagreen spots following in regular sequence, and the yellow colour 

 of their bases spreading along this area; this subdorsal line runs 

 horizontally from head to 8th abdominal segment, and there turns 

 up to the base of the caudal horn. The spiracles are conspicuous 

 and they bear the same relative sizes as in the 1st instar except 

 that on the 7th they are a trifle smaller than those on the 8th, 

 but still larger than those on abdominal segments 1 — 6 (July 18th, 

 1 901). Penultimate instar : The most noticeable feature of this 

 instar is that the development of the shagreen hairs is much 

 stronger ; those on the head being black and distinct, although 

 short, and some of them are bifid at the tip ; those on the 

 body are black, deeply forked at the tip. Some of the primitive 

 setae are still in evidence, being longer than the shagreen hairs, 

 and not bifid at the tip. Tubercles i and ii still appear as trapezoidals, 

 iii is well above and slightly posterior to spiracles, iv directly below 

 on the subspiracular flange. The horn is not degenerating at 

 this stage and has two hairs at tip although it is not distinctly 

 forked ; in addition to the shagreen hairs, there is a coat of minute 

 short black spicules present, except on the coloured areas of the 

 longitudinal bands and the coloured skin-bases of the shagreen 

 hairs (July 29th, 1900). Final instar ; Head small ; thoracic 

 segments tapering ; the larva, as a whole, slender and of elegant 

 shape. Head, dull sage-green in colour, rather tall, a rounded 

 trapezoid in shape, notched at crown ; the mandibles and upper 

 joints of antennae pale brown ; the bases of antennae and mouthparts 

 (other than mandibles) green; ocelli pale brown or yellowish; numerous 

 fine short hairs scattered over surface. Body pale apple -green 

 above to dull glaucous or sage-green beneath ; a broad white sub- 

 dorsal band edged above with dark green is present on abdominal 

 segments ; this turns upwards, and ends at the base of the horn ; for- 

 ward it narrows down, and is yellowish rather than white, becoming 



