ANDRICUS PILOSUS. 67 
Andricus nudus, Adler. 
(Plate XIII, div. A.) 
Andricus Malpighii, Cameron; A. nudus, Mosley. 
English name of gall.—* The Bald Seed Gall.” 
Position of gall.—On the flower-stalk of staminate catkin. 
Manner of growth.—Sessile, glabrous, glossy, gregarious, 
pointed. 
Colours.—Pale green, yellowish-green, yellow, brown. 
Average dimensions of a mature specimen.—Length, 
15 mm. ; breadth, 1 mm.; girth, 3 mm. 
May be sought during the months of May and June. 
Growth is complete by the end of May. 
The typical condition of the gall is unilocular and unilarval. 
j The larva pupates in the gall. The imago emerges during 
une. 
Alternate agamic generation: Aphilothriz Malpighii, Adler. 
This gall is found usually on the high branches of 
large trees. It is very small and inconspicuous, and 
but for its gregarious manner of growth would rarely 
be noticed. It is ovoid in shape, with a minute nipple- 
like process on the apex, upon which there may be a 
very few small hairs ; otherwise it is perfectly glabrous. 
Seven appears to be the usual number of galls in a 
cluster, and seldom more than two clusters on the 
same catkin stalk. 
It was first discovered and described by Dr. Hermann 
Adler during his investigations in 1876-8. I have 
found it plentiful on Quercus sessiliflora at Hastings. 
Andricus pilosus, Adler. 
(Plate XIII, div. B.) 
Andricus pilosus, Licht., Mayr, Cameron, Mosley. 
English name of gall.— “ The Hairy Catkin Gall.” 
Position of gall.—On the flower-stalk of staminate catkin. 
Manner of growth.—Sessile, pilose, solitary (usually), ovoid, 
pointed. 
Colours.—Pale green, green, pale brown, dark brown. 
