which surround the lower margin of the abdomen. The tail, 
at first sight, appears to constitute a natural and inseparable 
part of the larva. It is, however, formed by accumulation 
of the faeces, which, when ejected, are received and retained on 
a sort of fork, springing from the apex of the body, and form- 
ing a screen over the insect during this state of its existence. 
This faecifork (to use the term that eminent entomologist 
Mr. Kirby would give it) is movable on the point of the 
anus, as on a pivot, and turns the screen it supports in any 
direction. If this screen or guard is broken off, another is 
formed in the course of a day. When the change to the pupa 
state is near the larvae cease to feed, the fecal formation is 
stopped, and the shagey screen soon disappears. On the 16th 
of July several pupze were completed, and on the 23d appeared. 
the insect in its perfect form. 
It is of a rounded oval figure, six lines in length, and five 
inbreadth. ‘The thorax and margins of the elytra are white, 
and so thin, that the forms of the legs are seen through them ; 
the middle portion of the shield is brown, with broad margins 
of black, and the same colour extends in broad arms to the 
margin on each side, both above and behind; the anterior 
spots touch the points of the shield. A single tubercle marks 
the middle of the shield in front. The antennz consist each 
of eleven articulations, and are subclavate ; the two terminal 
ones are black, the rest white; the basal joint longest, the 
second shortest, the eleventh, or last, pointed. The under 
side of the body is white, the legs are white, except the 
tarsi, which are rufous. ‘The eyes are black; a black spot 
marks the mouth, and a rufous margin surrounds it. 
I am, Sir, &c. 
Clapham, June 30. 1829. T. HL 
