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they are formed of soft woolly tissue, among which are small 
cavities, each inhabited by one orange larva of Cecidomyia (Hor- 
momyia) floricola Winn. They are common at Banchory, near 
Aberdeen, Strathdon, Braes.of Gight, &c., in autumn. 
B. Occur towards the tip of the stem among the leaves, usually 2 — 6 
on each stem; they seem to be abortive leaves ; they are ovate, 
acute, about + x jz inch, sessile, partly reddish brown, partly 
greenish, and single celled, and each occupied by one larva of a 
. Cecidomyia, that I have not succeeded in rearing. They are 
common in Autumn, near Aberdeen, at Scotston, Parkhill, &c. 
Achillea Millefolium L. (= Yarrow or Millfoil). 
A. Like a. on Achillea Ptarmica, but smaller usually, and wants the 
reddish tinge; it is the work of the same species C. floricola 
Winn. The galls occurred near Aberdeen. 
B. Occur singly on the stem in the axils of the leaves, or two or 
more Close together on the lower part near, or just below ground. 
They are triangularly ovate (the side next the stem largest and 
slightly concave), blunt, about 3 X % inch, naked, smooth, and 
green or purplish-brown. When they reach maturity they split 
open at the top irregularly. The walls are thick and fleshy, and 
enclose a small cavity lined with silky hairs, and occupied by one 
larva of Cecidomyia (Hormomyia) Millefolii Léw. I have found 
galls near Aberdeen and near Balmoralyin August and September. 
Senecio Jacobeea L. (common Ragwort or Wild Tansy). 
aquaticus Huds (Marsh Ragwort or Marsh Tansy). 
The galls consist of flowerheads, which become swollen to twice 
their natural size, and fleshy, and remain green like the buds, 
either never flowering or only showing the tips of the corollae. On 
making a section, a pretty large cavity is found above the recep- 
tacle, and in it are several reddish-orange larve of Czcidomyia 
Jacobee Low. ‘I have found them in August, commonly on S, 
Jacobea, in Glen Gairn, Strathdon, and at Braes of Gight, and on 
S. aquaticus, beside the Dee near Aberdeen, on Scotston Moor, 
and at Braes of Gight. On the latter plant they do not reach so 
great a size as on the former. 
Hypocheris radicata L. ‘= Cat’s ear) consists of a deformity of an ovary, 
which becomes globular, about 4 inch in diameter, brown, and 
traversed longitudinally with muricated ridges. The walls are 
thin, and enclose a cavity inhabited by one white larva of Trypeta? 
I have found the galls once or twice in the end of July on the 
Old Aberdeen Links. 
Hieracium sylvaticum Sm. (— Wood Hawkweed) galls of Aulax Hieracii 
Bouché (Aulax Sabaudi, Hart.). They are rounded swellings of 
the stem, }-{ inch in diameter, and are usually situated where the 
stem divides into peduncles, which then rise out of the mass, as 
do also usually one or more leaves; the surface is hairy, but loses 
the hairs after atime. On section they show compact-walled round 
or oval inner cells, sunk in a loose pithy tissue. These galls are 
pretty common in a hollow among the sandhills on Murcar Links 
In autumn. 
Hieracium boreale, Fries. A. Galls of Aulax Hieracii Bouché. They 
sare like galls of A. Hieracti on H. sylvaticwm in structure and in 
appearance, but are usually larger (}-14 inch across), and are some- 
times situated on the peduncle, just below or including the lower 
part of the flowerhead, or (rarely) project from the receptacle 
among the flowers. I have found these galls common in August 
and September beside the Dee at Banchory, and in Glen Gairn, 
