very injurious to Fruit Trees. 441 
occurred to me upon its ceconomy, and the most probable means 
of extirpating it. 
Eggs.—I have never been able to detect any of these upon 
the, parts of the tree where I conjecture they are laid; but se- 
veral were depusited on the sides of a glass jar, under whiclr I 
had kept the two sexes from their first exclusion. They are 
lentiform, flat below, slightly couvex above, smooth, pale red in 
the middle, with a white and apparently membranous margin. 
Altogether they very much resemble the seeds of the common 
garden Stock, except that thev are not above one-fourth of the 
size; and they presented an appearance so very dissimilar to 
that of the eggs of insects in general, that 1 for some time 
overlooked them. 
Larva.—The eggs above mentioned not having produced any 
larve, I am unable to say any thing as to the precise period at 
which they are hatched; but from observations made on those 
found in the fruit-trees, I conjecture that they appear very shortly 
after the eggs are laid, and immediately proceed to insinuate 
themselves beneath the bark. When full grown, they are from 
four lines to half an inch long, and about a line broad; and 
wholly of a dull semi-transparent white colour, except the head, 
which is pale chesnut, which with the adjoining segment is also 
sometimes tinged. In some specimens, an obscure reddish line 
runs along the body, which is owing to the red colour of the fluid 
contained in it. ‘The body, besides the head, consists of twelve 
segments, which, owing to the wrinkles in the ‘three first, are not 
very easily counted. To each of the three first segments below, 
are affixed the usual pair of clawed feet, the claws of which are 
sometimes yellowish; and a pair of tubercular or false feet, as 
they are often called, are attached to the 6th, 7th, Sth, 9th, and 
12th (or last) segments: so that in all the insect has, as is usual 
in this tribe, sixteen feet ; six clawed, and ten tubercular. Each 
of the segments above, is furnished with from four to six slightly 
elevated protuberances or mamille, more polished than the rest 
of the body, ofa rather darker colour, and having one and 
sometimes two short stiff white hairs proceeding from each. As 
these mamille seem to furnish the best characters for diserimi- 
nating these larvze {rom others of the same tribe closely allied to 
them, } t will be necessary to advert to their number and position 
more narrowly. 
There are none on the first segment. On the second, third, 
and Jast, are four. placed in a transverse line: and on each of 
the remaining segments, that is, from the fourth to the eleventh 
inclusive, are six, one on each side and four in the middle, 
forming a square, of which the two anterior are larger and nearer 
to each other than the two posterior, It is to be ob erved that 
Vol, 59, No. 290, June 1822, 3 oi this 
