162 AEGB GALATHEA. 



being 1 mm. in height, and nearly 1 mm. in its widest 

 diameter, but about § mm. across the top, and the 

 same at the base which is cupped. The shell looks like 

 dull bone- white china, and is covered all over with 

 very shallow rhomboidal network, with very tiny knobs 

 at the knots, and with a central patch of finer meshes 

 on the top. The young larva is about 2\ mm. long, 

 squat looking, with large head, and body tapering 

 thence to tail; the skin not shining, the usual warts 

 round and prominent, each bearing a longish stiff 

 curved bristle ; the head granulated and set with some 

 hairs rising from round warts ; colour a whitish buff, 

 with yellowish-brown dorsal, and rather broader sub- 

 dorsal, lines ; the warts whitish, the head brownish 

 with whitish warts. At the length of 6 mm. the larva 

 has not changed its appearance much. The full-grown 

 larva is about 30 mm. in length, stout in figure, cylin- 

 drical, tapering from the fifth segment both to the 

 head and to the tail; the head is proportionally small, 

 almost globular; the anal flap ending bluntly, and 

 furnished with two short spines pointing backwards ; 

 the skin dull, finely set all over (head included) with 

 short hairs ; all the legs are small and short, and are 

 placed well together. In colour this species is variable, 

 the variety of which I have seen most examples has the 

 ground colour buff, and the lines more or less brown ; 

 but I can now describe in full only the variety I have 

 seen this summer, with the ground colour of very pale 

 yellowish-green, the dorsal line very dark green but 

 beginning paler on segments 2 to 4; in the sub- 

 dorsal region comes a stripe of paler yellower tint 

 than the ground, edged with darker green, faintly 

 above, but more strongly below, these edgings most 

 distinct about the middle of the body; the spiracles 

 small, round, black ; there is a subspiracular line paler 

 than the ground but not distinct; the head pale pinkish- 

 brown, anal spikes pink; belly much the same colour 

 as the back ; the true legs faintly brownish, the ventral 

 prolegs green ; the pubescence pale. 



