ANDRICUS AMENTI. 51 
the larval cell within it. The lower half contains one 
or more cells; there may be as many as five. 
The outer wall rises above this portion and forms an 
empty cup-shaped space. The rim of this outer 
growth, when mature, often becomes ragged, shrunk, 
and twisted, it also curls inwardly, meeting at or near 
the centre. 
The colour of the gall is a very pale green, or a 
greenish-yellow, and during the period of formation it 
is soft and succulent, ultimately it hardens consider- 
ably. The investing tissue is at first greenish-yellow, 
often suffused with red, which, as growth proceeds, 
turns reddish-brown, and when mature is hard and 
woody. 
Andricus amenti, Giraud. 
(Plate V, div. B.) 
Andricus amenti, Mayr, Fitch, Cameron, Mosley. 
English name of gall. —‘‘ The Hairy Catkin Gall.” 
Position of gall.—On staminate catkins of Q. sessiliflora. 
Manner of growth.—Pilose, single, and in clusters. 
Colours.—Pale green, greenish-yellow, brown. 
Average dimensions of a mature specimen.— Length, 
2mm.; breadth, 1 mm.; girth, 3 mm. 
May be sought during the months of May and June. 
Growth is complete by the end of June. 
The typical condition of the gall is unilocular and unilarval. 
The larva pupates in the gall. The imago emerges during 
June and July. 
Parasites, Nos. 62, 83, 104. 
This gall was first recorded for Britain by Professor 
Trail, who found it at Braemar. It is also recorded 
from Kew. 
The galls are small and inconspicuous. They are 
found attached to the staminate catkins of Quercus 
sesstliflora, in groups of twos and threes, but some- 
times as many as eight in one cluster. 
The shape of the gallis oviform, somewhat elongate, 
rounded and narrow at the base, tapering towards the 
