49 
HOLCUS MOLLIS L. 
In both these grasses in autumn one very frequently finds shoots 
remaining short, stunted, and clubbed, the leaves being crowded 
and showing a tendency to become fleshy at the base. Between 
the bases of the leaves are numbers of wingless long-bodied 
Aphides, of the species mentioned above (see Buckton’s “* British 
Aphides,” Vol. II., 147-8, pl. LXXXV., f. 1-3). The galls on 
Holcus are extremely common in many places ; on Agrostis they 
are less frequent. In spring one meets with similar pseudogalls, 
formed by the same insects, on Ste//aria Holostea and on Cerastium, — 
as already noted under these plants. 
FESTUCA OVINA L. 
In August, 1882, and again in July, 1883, I found in various 
localities in Braemar, and on the Links near Aberdeen, stem-galls 
on this grass. They are not readily observd, as the plants affected 
show hardly a trace ot injury,in the parts exposed to view. I have 
never found more than one gall on a stem; and it is situated 
always near the base of one of the lower internodes of the flower- 
ing culm. ,,The whole circumference is affected, but growth is more 
rapid on one side, so that the culm becomes bent and the gall 
bursts through the lower part of the leafsheath. Its surface is 
smooth or nearly so, its colour dull brownish yellow. In size the 
galls do not seem to exceed 8 by 3mm, They taper at each end 
into the culm, but more gradually upwards. On section the wall 
is found to be thin but compact, and the central space is rather 
large. Each gall contains one hymenopterous larva, about 
4 mm. long and 1 mm. thick, of a honey-yellow colour. . 
'APPENDIX.—Additions to “GALLS and their makers in DEE,” 
including species already recorded in “The Scottish Naturalist,” 
since the publication of my paper in Trans. Abdn. Nat. Hist. Soc., 
1878. (References to these records in the“ Scottish Naturalist” are given in brackets). 
I have thought it desirable to supplement the list of galls new 
to Scotland, in the preceding paper, with an account of the 
additions recorded by myself at intervals from the north-east of 
Scotland since 1878, and which have not as yet been brought 
together for “Dee.” They are as follows, enumerating the plants, 
as before, in the botanical arrangement for convenience of 
reference : 
G 
