24G 
RED DNDERWING. 
and the outer one attenuated and forming an acute 
V-shaped angle towards the inner mai'gin ; the 
apex and the fringe greyish-white, each tooth of 
the latter bearing a transverse dusky arc. 
The caterpillar is attenuated at both extremities ; 
the colour grey, inclining to white, and variegated 
with brown; having two rows of small tubercles 
along the back, and a callous protuberance on the 
eighth segment. The belly is greenish, with a lon- 
gitudinal series of black spots in the middle ; the 
head bordered with black. The chrysalis is reddish- 
broum, and covered with a kind of bloom of a blue 
colour. The caterpillar feeds on the poplar and 
■willow ; and the moth continues to frequent these 
trees, and may often he seen reposing on their 
stems, particularly of the' willow. It occms very 
frequently in the southern parts of England, and 
is not rare even in the more northern counties, 
although 'we are not aware that it extends to 
Scotland. 
"We now come to that section of the nocturnal 
lepidoptera which includes the extensive family of 
Geometrine moths, the peculiar characters of which 
have already been alluded to. They constitute the 
Phalamce geomelrm of Linne, and the Lepidoptera 
semidiurna, Phaloenites, or Arpcntetim, of more 
recent -writers. The caterpillars are remarkable for 
their mode of progression and long narrow bodies, 
■which are generally free from hair, but not unfre- 
quently furnished with knobs and protuberances. 
