AVENTIA FLEXULA. 135 
below the spiracles is a rather nflated projecting ridge, 
fringed with a row of fleshy filaments ; some of these 
filaments are simple, others are branched like the 
‘“‘ chevaux de frise” one sees sometimes on enclosure 
walls; the belly ts flat ; the anterior legs well developed ; 
the first two pairs of ventral legs much shorter than the 
other two pairs, though each pair is progressively longer 
than the preceding, the anal pair being the longest ; the 
dorsal tubercular warts are prominent, each furnished 
with a fine short hair; on each seqment the hinder 
pair is much larger than the front parr, and on the 
ninth and twelfth segments largest ; on the twelfth they 
are placed on a transverse prominent ridge. 
The colour is of a more or less pale dull bluish or 
greyish green, or else this colour slightly tinged with 
brownish-ochreous, rather paler on the sides; the 
dorsal linedarker green,—being, in fact, aseries of spear- 
points faintly edged with whitish green, and by short 
black streaks at the end of each segment; the sub- 
dorsal marking is a paler tint of the ground, to be 
seen plainly only just at the segmental divisions, but 
its course is indicated well enough on the other parts 
by a fine sinuous line of black above, and a line of 
darker green below; the ninth and twelfth segments 
are darker in tint than the others; slhght curves of 
blackish dots or dashes are on the back of the second, 
third, and fourth segments along the subdorsal region; 
the head is more whitish-green than the body, and is 
marked with spots and curves of black on each lobe 
and about the mouth; the tips of the tubercular warts 
are black, on bases of whitish-green, and a broad 
streak of this pale colour is on the side of each seg- 
ment beyond the fourth; the filaments are greenish- 
white; the belly a dull, pale bluish-green ; the ante- 
rior legs are spotted with black; a black streak runs 
down the front of the fourth pair of ventral legs; 
the spiracles of the ground colour are ringed with dark 
brown. 
‘The habit of the larva is to he close by day for hours 
