LITHOSIA MUSCERDA. 27 



after which hour it has another short flight; and 

 probably there is a third flight in the morning dusk. 



The egg was noted as small and shining. The 

 young larva is of a dirty whitish colour, with black 

 head, the tubercles furnished with single, stiff, dark 

 hairs. When the larva is about one-fifth of an inch 

 long the tubercles are shining black, and furnished 

 with tufts of short hairs, the head shining black, the 

 general colour of the body and hairs dull black, dorsal 

 line and segmental folds velvety-black, a pair of dull 

 orange spots on the second segment. This appearance 

 continued up to the last moult ; after that had taken 

 place for an hour or two the colouring was very 

 striking; the head was shining white, and while the 

 tufts on the first segment and down the centre of the 

 back were darkish brown, all the others were bright, 

 light reddish-brown; but this gay dress was sobered 

 down again. 



The length of the full-grown larva is about three 

 quarters of an inch, the figure rather stout, cylindrical, 

 tapering only at the second segment and head, and 

 again at the thirteenth; the legs well developed; 

 eight tubercles on each segment raised and tufted, the 

 front dorsal pair being only moderately large, but the 

 hind pair much enlarged and transversely oval in 

 shape ; on segments 3 and 4 the front pair are larger 

 than the hinder pair; all these tubercles thickly set 

 with very short hairs. The general colouring is rusty 

 black, the ground colour of the body being velvety 

 blackish-brown, marbled with reddish-grey, the dorsal 

 stripe and subdorsal line deep velvety-black ; on each 

 side of the dorsal line on the second segment, and 

 again on the front of the thirteenth, is a squarish, 

 dull, deep red spot ; head shining black ; tubercles and 

 hairs all deep brown ; each front pair of tubercles set 

 in reddish-grey rings. There is a fine reddish-grey, 

 interrupted subspiracular line ; the belly pinkish-grey ; 

 all the legs shining, dark reddish-grey ; tips of prolegs 

 pellucid. 



