ANDRICUS NODULI. 65 
The larvz pupate in the gall. The imagines emerge during 
April and May. 
Inquilines, Nos. 17, 182. 
This gall is mostly globular in form, but it varies 
in size, and also in shape from that of a cherry to 
that of a walnut. It is found generally on bush and 
scrub oaks. 
“Its whole surface is covered with stiff, stalky, or 
fibrous projections, which stand out radiately, and 
terminate in a rusty-red papilla. In section it exhibits 
a hard texture with numerous egg-shaped cavities; in 
these live the larvee, without being separately enclosed 
in an inner gall”? (Mayr). 
Mosley recorded it in 1892 occurring in Whitley 
Woods, Yorkshire. 
Andricus noduli, Hartig. 
(Plates XIT, IX, div. B.) 
Andricus noduli, Mayr, Marshall, Adler, Miller, Walker, Mosley ; 
A. trilineatus, Hartig, Cameron. 
English name of gall.—‘‘ The Knot Gall.” 
Position of gall.—Beneath the bark of twig and im leaf petiole. 
Manner of growth.—Separate, gregarious, glabrous, concealed. 
Colours.— White, very pale green, pale brown. 
Average dimensions of a mature specimen.— Length, 
2 mm.; breadth, 1 mm. 
May be sought during the months of June to August. 
Growth is complete by the end of July. 
The typical condition of the gall is unilocular and unilarval. 
The larva pupates in the gall. The imago emerges during 
August and September. 
Parasites, Nos. 56,108. Inquilines, Nos. 17, 110, 128, 145. 
Alternate agamic generation: Aphilothrix radicis, Fabr. 
Upon reference to Plate IX, div. B., it will be seen 
that the autumn—winter condition of twigs and leaf 
petioles containing many of these galls is very con- 
spicuous on account of the swollen and nodulose 
appearance. It is only when many galls close to each 
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