BOARMIA ROBORARIA. 31 
of the other segments; the seventh bears on its belly 
a pair of transverse puckered humps, in some speci- 
mens looking more like two sets of warts—three in 
each ; the twelfth has a slight transverse dorsal ridge 
bearing a pair of warts; 1n some specimens, also the 
fourth bears a pair of three-lobed, transverse, sub- 
dorsal humps; the front pairs of legs on the third 
and fourth segments are well developed, as well as the 
ventral and anal pairs; the anal flap triangular, some- 
what rounded at the tip, the thirteenth (under the 
flap) ending in two bluntish points, with a shorter 
sharper one between them; the skin glossy, but 
wrinkled on the hinder part of each seginent. 
The ground colour is generally purplish-brown, 
sometimes more cinnamon-brown, the folds and humps 
dark brownish-grey; there is not much pattern, and 
different individuals vary in the amount of patches of 
paler colouring, some having broad patches of cream 
colour in the spiracular region of the fifth and tenth 
segments ; the sixth sometimes tinged with rust- 
colour; the dorsal line appears as a palish dash on the 
front of each segment, and a spot just at the end; 
similar pale spots are sometimes seen where the sub- 
dorsal line should be on the sixth and ninth segments ; 
the head brownish; the spiracles dirty white, outlined 
with black. 
The whole appearance of the larva, both in out- 
line and colour, is extremely suggestive of an oak 
twig, and it preserves the resemblance under one or 
two changes of attitude; sometimes standing stiffly 
out, with the body in a straight line up to the eighth 
seoment, then the seventh bent shehtly upwards from 
this, and then from the sixth to the head again in one 
line; the head and thoracic segments and legs more or 
less “‘ bunched” together; sometimes standing off at 
a wider angle from a twig, and then with the whole 
front of the body from the sixth to the head inclined 
—in a stiff lne—towards the twig again; in this 
position it looks like what had been a forked twig, 
