PIURIS NAPI. 157 



not so neat at the apex, and always greener in colour. 

 The young larvse eat their empty eggshells, but I saw 

 no attempt to eat other eggs. The newly-hatched 

 larva is all but 2 mm. long, with the head large, and 

 the body stoutest in front, the skin shining, the colour 

 (paler than in rapce) being pale yellowish- white, head 

 and all, the internal vessels showing through of a 

 darker yellowish-drab tint; all the warts prominent, 

 though not so distinct as in rajoce, each with a long 

 very pale hair; after the larva begins to feed the 

 colour soon becomes a full green. After the first 

 moult, when the larva is 3-J- mm. long, the colour is 

 pale yellowish-green, with the front part of the body 

 much deeper in tint, the warts whitish, the hairs from 

 them darker than before, and the small dark dots with 

 short hairs appear. The cast skin is eaten. After the 

 second moult the length is 6 mm., the head shining, 

 clear yellowish-green, the body glaucous green, espe- 

 cially in front; the warts white, a few of the small 

 dots black. After the third moult the length is 10 

 mm., the colours as before, but many more small black 

 dots have come ; there is a dorsal line formed simply 

 by the absence of these black dots ; there is a dusky 

 green spiracular line, on the lower edge of which is 

 now a row of round yellow spots, each enclosing the 

 black spiracle. After the fourth moult the length is 

 16 mm., and the last skin appears ; the full-grown 

 larva is about 26 mm. in length, cylindrical, the head 

 rounded, narrower than segment 2, the body stoutest 

 at segment 7, tapering thence slightly forwards, and 

 more rapidly towards the tail ; the usual warts sharply 

 prominent, and the whole skin including the head set 

 with sharp points, all furnished with short hairs ; the 

 colour a full green, head rather paler, the dorsal line 

 shows rather deeper green, the dorsal and ventral 

 colours are sharply separated by the yellowish green 

 indistinct spiracular line, on which come the black 

 spiracles, each in a round yellow spot ; the belly is of 

 a paler greyer green, all the legs are green; on the 



