ACIDALIA IMITARIA. 123 
as a whitish line between two faint brown ones, and 
on the other it begins in that way, but the lines soon 
meet and become a brown line. The subdorsal is also 
brown, and is bordered above by a much paler stripe 
than the ground colour, which widens towards near 
the middle and attenuates towards the end of each 
segment. There is a spiracular line of brown rather 
fainter than the subdorsal, and this is followed by a 
puffed stripe of paler, nearly white. The spiracles 
are black. The tubercular dots are very minute, of 
dark brown, and the bristles also very short and 
fine. 
N.B.—At the beginning of each segment the 
whitish dorsal line is distinct, and marked on each 
side with a short line of dark brown. 
The ventral surface is a little darker and greyer, 
having a central pale stripe, and two brown ones on 
each side, the inner ones the darkest and running not 
parallel, but so as to enclose the central line in an 
elongated pear shape. A dark line runs down the 
ventral proleg, and the anal proleg is half brown 
behind. 
This larva, when alarmed, suddenly throws itself 
into a spiral shape of two coils, and sometimes bends 
itself together head and tail, and jumps from the 
ceround for an inch or two with sur prising elasticity. 
(William Buckler, 1871; Note Book I, 82.) 
This larva astonishes me by its extraordinary length 
and slimness; it rests with its four claspers attached 
almost close together, and its body elevated at an 
angle of 45 degrees, and swaying backwards and for- 
wards with every breath of air, or with the motion of 
the room, or the trembling of the hand; I do not 
allude to the undulating movement from side to side, 
which is a normal habit of Geometers when not per- 
fectly at ease. 
The head is semi-prone, and scarcely as wide as the 
second segment. ‘The body is uniformly slender, with 
a raised lateral] skin-fold interrupted at the divisions of 
