ANDRICUS TESTACEIPES. 71 
past most of the hairs fall off; they may also be easily 
removed by leaves or twigs rubbing against them. 
The gall is usually surrounded at its base by small 
leaf-scales ; sometimes attached by a rather lone and 
stout peduncle; almost always surmounted by a styli- 
form prolongation, which may be two thirds the length 
of the larval chamber, or even as long. 
The style varies much in shape, sometimes quite 
straight, sometimes considerably curved, ending bluntly 
or bearing a small papilla; growing from the centre 
of the apex of the larval chamber, or somewhat on one 
side. 
The larval chamber is large, the walls very thin. 
Occasionally the exterior will be slightly constricted 
near the base; sometimes longitudinally striated ; 
almost always glossy when the hairs are removed, 
and woody and hard in texture. 
Seldom two galls on the same twig, very rarely 
more than two. Some remain attached all through a 
mild winter, others fall at the slightest touch. 
Andricus testaceipes, Hartig. 
(Plate XVI.) oo 
Andricus Sieboldii, Mayr; A. testaceipes, Mayr, Adler, Licht., 
Kalt., Cameron, Mosley. 
English name of gall.—‘ The Leaf-vein Gall.” 
Position of gall.—On the petiole, under surface of mid-rib, and 
its offshoots. 
Manner of growth.—Glabrous, single, glossy, imbedded. 
Colour.—Green.. 
Average dimensions of a mature specimen. — Length, 
2mm.; breadth, 1 mm. 
May be sought during the months of July to September. 
Growth is complete by the end of August. 
The typical condition of the gall is unilocular and unilarval. 
The larva pupates in the gall. The imago emerges during 
August and September. 
Parasite, No. 56. 
‘Alternate agamic generation: Aphilothrix Sieboldi, Hartig. 
