THYMELE ALVEOLUS. 125 



The egg is globular, with base rather flattened ; the 

 shell ribbed rather irregularly with about eighteen ribs, 

 and transversely reticulated with very even fine lines, 

 which do not stop at the ribs, but cross them, giving 

 their edges a rough appearance which is not real, but 

 only caused by the ribs, otherwise translucent, 

 becoming opaque where the lines cross ; as usual a 

 small space on the top of the egg is covered only with 

 very fine concentric reticulation; the colour is very 

 pale green all over. 



The young larva makes its escape by cutting a large 

 round hole through the top of the egg ; in colour it is 

 very pale green, with head and collar shining black ; 

 every tubercular dot bears a pale bristle, longish and 

 straight on the head and thirteenth segment, but on 

 the other segments bifid, with the tips curved on either 

 side like an unbarbed double fish-hook. When about 

 a sixth of an inch long the colour is pale purplish-pink, 

 the head still black ; when nearly half an inch long it 

 is pale green again, the whole skin now thickly set 

 with short straight hairs ; the bifid bristles have been 

 parted with, I imagine, at the first moult. 



When full-grown, the length is rather over five 

 eighths of an inch, the figure very stout, the head 

 horny, globular, and stuck like a knob on the second 

 segment, which, however, is not so strikingly narrow 

 as in Thanaos Tages ; the skin granulated in appear- 

 ance ; the head and whole body covered thickly with 

 short fine pale hairs ; the general colour a pale 

 ochreous-green, the second segment pinkish, and a 

 faint reddish tinge over the back of the other front 

 segments ; a thin dorsal, and somewhat broader sub- 

 dorsal line, not easy to be seen, of the ground colour, 

 and a faint spiracular line ; the spiracles not much 

 darker than the ground colour ringed with the same 

 tint as the lines ; the belly freckly ; the head 



of the larva; Mr. W. H. Harwood has discovered that it feeds more 

 commonly on Potentilla fragariastrum (the barren wild strawberry or 

 strawberry-leaved cinquefoil). — J. H, 



