OF EPPING FOREST. 145
about May 20th. I also found some fresh specimens on May 25th,
but this species was not plentiful. I have met with it at Lynton,
Devonshire.
(6).—Sexual generation. VI. Neuroteus aprilinus (Gir.)
Gall.
Appears from the bud. Smooth and often polythalamous.
Colour: Greenish yellow. Shape: Circular to pear-shaped,
the apex being usually narrower than the base which is
embedded in the bud scales. Larval cavity large, walls
very thin.
Imago.
I have, unfortunately, been unable to breed flies from these
galls, as in all the specimens which I found the perfect insects
had already emerged.
The galls appear in April, and the insects towards the end
of the month or the beginning of May. They may be situated
in either the terminal or auxiliary buds, and yield up the perfect
insect very soon after they make their appearance from the
buds. With regard to the agamic generation of this species
some uncertainty seems still to exist. Beyerinch gives A.
solitarius as the agamic form, but this is probably a mistake.
Von Schlechtendal and Dr. Loew give Neuroterus schlechtendali
(Mayr), and Cameron also inclines to this view, but at the same
time, in his description of the perfect insect, he describes it as
sexual. Dr. Adler mentions Neuroterus ostreus as the probable
agamic form, and Professor Mayr seems to have since verified
this, but the insect belongs to the genus Andricus, and not to
the genus Neuroterus.
OCCURRENCE IN EPPING FOREST.
I found a fair number of specimens of this gall, though it was
not plentiful. The first appearance I noted was on May 10th,
at which time the perfect insect had already emerged.
These galls become brown with age.
Genus DRYOPHANTA (Foerster).
The agamic forms of this genus are usually easily separated,
but the sexual forms present very similar characters, and it is
impossible to differentiate between the species. The two genera-
tions, Agamic and Sexual, are readily distinguished. The former
have the legs covered with stiff hairs, which are absent in the
K