40 
them in Orkney. Of gall (¢) I did not find any trace either near 
Aberdeen or in Orkney. The latter gall has been described from. 
various localities on the Continent. The mites live in the flowers. 
LEONTODON AUTUMNALIS L. :— 
On this plant I found mite-galls on the leaves in considerable 
numbers in the beginning of October, 1883, among low growing 
grasses on the cliffs of the Kincardineshire coast near Aberdeen. 
The galls consist of the leaf-margins altered so as to become 
thickened, fleshy, and dull red or purple. The surface of the gall. 
is covered with abundant red hairs, which give it a slightly velvety. 
appearance. Very frequently the margin of the leaf is rolled up- 
wards and inwards, in some cases for the greater part of its length. 
Occasionally the galls are hardly larger than a pin’s head, but 
usually they are over an inch in length; but they are never con- 
spicuous. On microscopic examination of the gall, the mites are 
to be found in small numbers among the hairs. On section the 
tissues in the interior of the leaf are found little altered, though 
the epiderms on both surfaces are much modified, and the 
hypoderm is thickened, and has its cells slightly enlarged and 
modified in shape. I can find no previous record of the occurrence 
of galls on this plant. 
HYPOCHOERIS RADICATA L. :— 
(a) Galled ovary (Sc. (Vat. IV, 16.) 
(6) Leaf-galls caused by Anguzllulide belonging to the genus: 
Tylenchus, Externally they are small thickenings, usually near or 
around the mid-rib, about 2 to 5 mm. long by twice the thickness 
of the mid-rib. The surface differs little from that of the rest 
of the leaf, save in its yellowish green colour. In structure it 
much resembles the gall (b) on Aieracium Pilosella next to be 
described. The galls were not rare on a spot on the Links north 
of Aberdeen in August, and one specimen was found in Rannoch 
in September, 1882. Eggs and young animals were common 
enough in the galls at that season. 
HIERACIUM PILOSELLA L. :— 
(a) Galls of mites (Phytoptus), being inrolled leaf-margins, are 
exeedingly common on the Links north of Aberdeen in autumn, 
though local apparently. Frequently several of the leaves in a 
rosette remain small, with the pale lower surface visible owing to: 
the margins continuing to be closely involute from the base eve 
to the tip of the leaf usually, though at times only in spots here 
and there. Not seldom almost every leaf on some of the smaller 
