28 On an Insect injurious to Fruit-trees. 



Larva. The eggs above mentioned, not having produced 

 any larvae, 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 imme- 

 diately 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 

 chestnut, with which 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, 8th, 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 protube- 

 rances or mamillae, more polished than the rest of the body, 

 of a rather darker colour, and having one, and sometimes 

 two, short stiff white hairs proceeding from each. As these 

 mamillae seem to furnish the best characters for discriminat- 

 ing these larvae from others of the same tribe closely allied 

 to them, it will be necessary to advert to their number and 

 position more narrowly. There are none on the first seg- 

 ment. On the second, third, and last are four, placed in a 



