130 The Galls of Essex; a Contribution to a
larva pupates within the mostly
unilocular gall. Aulax Glechomae,
Hartig. (Fig. 15).
Plantaginea.
Plantago lanceolata, L. Flower-
stalk. Greenish, succulent, oval
swellings of the peduncles or flower-
stalks. The gall is about 1/4 in. long
by 1/8 in. in diameter, tapering at
both extremities into the stalk ; it
is strongly ribbed, and is uni-

Fig. 15. Aulax Glechomae.
locular. The larva pupates within
the gall, and the perfect beetle ap-
pears in the autumn. Mecinus pyraster, Herbst.
Polygonaceae.
Polygonum amphibium, L. Leaf. The leaf-margin is
thickened or rolled, mostly on both sides, and is orange or red
in colour. The larvae pupate within the gall. Cecidomyia
Persicariae, Linne.
Polygonum Persicaria, L. Leaf. Similar galls to those
above described, produced by the same gall-gnat.
Euphorbiaceae.
Buxus sempervirens, L. Leaf. The leaves are swollen
and slightly discoloured. The yellow larvae, pupate within
the pseudo-gall. Diplosis Buxi, Laboulbene.
The very common terminal leaf-bladders are produced by
Psylla Buxi, Linne.
Urticaceae.
Urtica dioica, L. Leaf, leaf-stalk, flower-stalk. The galls
are mostly globular, hairy, fleshy swellings, either on both
surfaces of the leaves themselves, or on the leaf- or flower-
stalks, pale green in colour, but frequently rosy; they occur
singly or occasionally in masses. The whitish larvae leave the
galls and pupate in the earth. Cecidomyia Urticae, Perris,