420 
THE ENTOMOLOGIST. 
May, and continues feeding until the middle of June, when it 
is full fed; it then rests indifferently on the upper or under 
side of the leaf, or on the twigs, which are then young and 
green, with its head, legs and claspers entirely concealed; 
nevertheless, in crawling, or rather gliding, for its motion 
exactly resembles that of a slug, the anterior part of the head 
is just visible peeping from beneath the shield-like margin of 
the 2nd segment. The head is very small, glabrous, and com¬ 
pletely retractile within the 2nd segment, the semicircular 
margin of which projects beyond it. The body is of that 
shape usually described as onisciform, or wood-louse shaped, 
or, perhaps more correctly speaking, shaped like the genus 
of shells called Chiton, some of which may be occasionally 
found on all our sea-side rocks. The segmental divisions are 
clearly marked on the dorsal area; the anterior margin of 
each is elevated; the posterior margin is decidedly waved, 
and overlapping the anterior margin of the next following 
segment; the lateral margin of each segment is produced, 
and the union of the ventral and dorsal areas takes place 
almost on a medio-ventral line; there is a medio-dorsal 
furrow, or channel, which bisects the elevated anterior 
margins of the dorsal segments, causing each segment, from 
the 4th to the 11th, to bear two humps, or tubercles: these 
pairs of tubercles, seven in number, seem to bound the 
medio-dorsal furrow, and render it more conspicuous; every 
part of the dorsal area emits delicate hairs, which are more 
especially visible when the larva is viewed sideways: the 
head is black and shining, except a pale whitish interspace 
between the lateral divisions; the dorsal area of the body is 
dingy brown, approaching to red-brown on the sides, and to 
green in the interspaces of the segments; the ventral area is 
also greenish ; on each side of each segment are two oblique 
and very ill-defined stripes of a paler shade, and when the 
larva is at rest the upper of these meets the lower one on the 
next following segment, thus producing the appearance of its 
having eight oblique stripes on each side; the legs and 
claspers are pale dingy green, obscurely diaphanous. When 
full fed these little fellows spin a rather elaborate scaffolding 
of silken threads on the surface of the twig or branch, on the 
leaves of which they may happen to be feeding, and by 
means of other silken threads they attach themselves to this 
