List of the Insect Fauna of the Comity. 127
plainly visible on both sides. It is multilocular, but the
lame leave the gall and pupate in the earth. Hormomyia
Corni, Giraud.
Stellatae.
Galium verum, L. Stem. Smooth, shining, somewhat
hard, pink or whitish swellings of the stem ; single galls are
generally more or less round, but several galls mostly occur
together. The stem itself is not further distorted; occasionally
the galls occur on the flower-stalks. The orange larvae leave

the gall and pupate in the earth.

Cecidomyia Galii, H.
Loew.
Compositae.
Achillea Millefolium, L. Leaf
axils. These are cup -like, thickened,
greenish, or purplish brown, swell-
ings occurring singly or in pairs in
the axils of the leaves ; the tops of
the galls are irregularly coronate,
and the larvae emerge thence and
pupate in the earth. Hormomyia
Millefolii, H. Loew. (Fig. 11).
Fig. 11.
Hormomyia Millefolii.
Tanacetum vulgare, L. Leaf,

stem, flower. The single gall is
smooth, green, bell-shaped or ovate, with a notched crown
at the apex; it opens here when mature. The walls
are thick and fleshy, and each gall contains but one larva;
frequently, however, two or more coalesce, and occasionally
the stem is completely surrounded with the confluent fleshy
galls. The galls mostly occur singly on the midribs and
pinna of the leaves, or several together in the axils of the
leaves, or as a terminal bunch on young plants ; more rarely
seven or eight galls may be found on the receptacle of the
flowers, these generally purple and green in colour. The
bright orange larvae pupate in the earth, but frequently
also in the galls. Oligotrophus (Hormomyia) Tanaceticolus,
Karsch, or possibly only a variety of H. Millefolii, H.
Loew.