List of the Insect Fauna of the County. 123
sedge. In this manner a kind of boat is formed for the
protection of the colony. In the autumn the Aphis reverts
to the Caryophyllacea."
Tiliaceae.
Tilia Europaea, L. Twig. A round, hard, generally red,
swelling of about the size of a pea on the young twigs, more
especially on those growing from the roots or base of the
trunk. The gall is unilocular, and the larva pupates within
it. Sciara Tilicola, H. Loew.
Papilionaceae.
Sarothamnus scoparius, Winim. Twig. Black, elongate,
bud-shaped galls on the upper twigs; several on one twig.
The larvae pupate within the gall. Asphondylia Sarothamni,
H. Loew.
Trifolium repens, L. Leaf. The
leaflet is folded longitudinally and
thickened, often lighter in colour,
around the midrib. The larva
quits the leaf and pupates in
the earth. Cecidomyia Trifolii,
P. Low. (Fig. 3).
Lotus corniculatus, L. Flower.
The flower is much enlarged, and
does not open, also much greener
in colour. The larva pupates in
the earth. Diplosis Loti, De
Geer Fig. 3. Cecidomyia Trifolii.
Rosaceae.
Prunus communis, Huds. (spinosa, Eng. Bot.). Leaf. The
leaf is thickened and formed into a pouch or purse, with
the midrib for its hinge; mostly red in colour. The
orange larvae pupate in the ground. I have bred many
specimens of the gnat. Cecidomyia Pruni, Kaltenbach (un-
described ).