THE ENTOMOLOGIST. 29 
than long (two to four centimetres in diameter). It is fully 
developed about the middle of May, when it is of a pale 
yellow or brownish yellow colour, but where exposed to the 
sun it assumes a rosy tinge. ‘This fungoid gall exhibits in 
the interior a great number of egg-shaped, yellowish white 
larva-cells, which are closely surrounded by the spongy 
parenchyma, At the end of May or beginning of June the 
gall-makers, as well as the inquilines and some parasites, 
make their appearance. In June the rose-chafers (Cetonia) 
eat their way into these galls in such a manner that the 
spongy tissue is either partly or entirely consumed, and 
the galls become resinous. If we look for the galls of this 
species in the following winter or spring, on the twigs, 
we shall find the fungoid substance entirely destroyed by 
efflorescence, and only the inner galls remaining, adhering 
to one another. From these inner galls, however, parasites 
are often produced, even in the second year.—G. LZ. Mayr. 
The gall of this species is the well-known oak-, or King 
Charles’, apple, and is probably one of the best-known 
insect-productions of Britain, but not so generally is the 
production connected with the producer ; it is very widely dis- 
tributed. The galls, which vary greatly in size—more so than 
in the dimensions given by Dr. Mayr—are, or were formerly, 
in great request upon the anniversary of the Restoration, the 
29th of May. Respecting life in these galls, I cannot do 
better than reprint two notes of the late Mr. Francis Walker 
on the subject, one published as long ago as 1846, in the 
‘ Zoologist’ (iv. 1454—7) ; the other recent (Entom. v. 432), 
but referriug as it does in a great measure to the previous 
paper, it is as well they should appear consecutively. 
“List of Insects inhabiting Oak-apples. 
“The well-known oak-apples are inhabited by a great 
variety of insects, which constitute a little world, and derive 
their nourishment either immediately or indirectly from those 
galls. The insects in the following list have emerged from a 
considerable number of oak-apples collected in the neigh- 
bourhood of Southgate during the summer of 1845. 
“June, 1845.—Nitidula grisea, 1. Balaninus glandium? 
149 during this and the following months of summer. Forfi- 
cula auricularia, a few in the summer; some of them were 
