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warts; on the lower surface they show a small opening surrounded 
_ by woolly hairs, sometimes projecting slightly, but usually sunk 
in a hollow of the leaf. The inner cell is irregular in form. The 
sides are covered with small warts. Hach is inhabited by a 
number of mites. The galls are rather common in Glen Gairn in 
autumn. 
Salix cinerea L. (Grey Willow or Sallow) A., galls of Nematus pedunculi 
Hart. They are like C. on S. caprea (formed by the same insect), 
but are more woolly and usually smaller in size. They are com- 
mon near Aberdeen. 
- B. Rosette galls similar in every way to those on S. caprea (E.) near 
Aberdeen. 
C. Galls of Cecidomyia salicis Schrk? The galls are swellings on the 
twigs, sometimes so slight as to be imperceptable till the insect 
has emerged ; they usually occur just below the buds, and on sec- 
tion show a long narrow cell, +x +s inch, and are inhabited by 
one or two larvee; usually several cells occur in a twig. They 
occur not uncommonly near Aberdeen. 
Salix aurita L. (Round-eared Sallow) A. Galls of Nematus pedunculi 
Hurt, like the galls of this species on S. caprea (C). 
B. Rosette galls, like EK. of S. caprea. 
C. Like F. of S. caprea. 3 
D. Like G. of S. caprea—galls of Cecidomyia Capree Winn. 
E. Phytoptus-galls, like H. on S. caprea. 
All these galls are common in many places in the district. 
Salix repens L. (Dwarf Silky Willow) A., galls of Nematus. They are 
round, or slightly flattened, 5 inch in diameter, attached to the 
lower surface of the midrib, but appearing on the upper surface 
of the leaf ona level with it; smooth, naked, greenish on one 
side, red elsewhere. Occupant, a saw-fly larva, common in Glen 
Gairn, Braemar, Strathdon, &c. 
B. Twiggalls of Cryptocampus pentandrae Retz? They are swellings }- 
4X7:-i inch, rounded or oval, tapering to both ends; their surface 
is like that of an ordinary twig. On section they arefound to_ 
enclose a single cavity, in which lives one saw-fly larva. ‘They 
were sent me from Braemar by Dr. White, in September. 
C. Phytoptus-galls, like H. on Salix caprea. Occur in Glen Gairn. 
Salix nigricans Sm. (Dark-leaved Willow). Bean galls situated in pairs 
on the leaves, one on each side of the midrib; they are green, 
naked, and shining; the maker is a saw-fly (Nematus). They are 
rather common in Glen Callater. 
Salix phylicifolia L. (Tea-leaved Willow) A. Bean galls on the leaves 
occurring in pairs, one on each side of the midrib; they are oval, 
about 4$X¢% inch, and do not project from the leaf on the lower 
surface; their surface is naked, slightly wrinkled, and dark green 
with streaks of reddish-brown; the walls are rather leathery, and 
enclose an irregular cavity tenanted by a saw-fly (Nematus ?) larva 
Abundant in July and August in Glen Gairn, in Braemar, and in 
Corgarff. 
B. Pea galls similar in form and in attachment to those of N. pedun- 
culi, (B) on S. caprea. They are about 3 inch in diameter, surface 
smooth or slightly warty, and bright green. Maker, a saw-fly: 
(Nematus). Abundant in same localities as last (A). 
Salix viminalis L. (Osier), galls of Cecidomyia marginem-torquens, Bremi. 
The margins of the leaf, fora length of an inch or more on one pr 
both sides, are revolute (sometimes even to the midrib), thickened, 
