H 
Juglans regia, L. Patches in the leaf, bounded by veins, 
become DU ee epi. bulged upwards, with a depression on the 
lower surface lined with brown hairs, — which live gall- 
mites, Hriophyes jraiesitus; var. erineus, 
Betula alba, Z. On the various forms of this species the leaf- 
blades are sometimes studded with numerous small hard bodies, 
prominent especially on the upper surface. In transverse section 
they are seen to inclose a set cavity that opens on the lower 
surface of the leaf by a nar tube. In the cavity, among hairs, 
live the tiny mites that angie iia gall, by name Hriophyes Betulae, 
Nal. The warts have received the name of Cephaloneon betulinum, 
Bremi. 
Alnus "pre Medic. Gall-mites produce on leaves at least 
two kinds of ga 
(a.) Small red or otherwise yar MM ben rounded er oval 
prominences, about 2 or 3 mm. in diameter; each is a pouch 
opening on lower surface by a disc hole ro closed by "hairs. 
This form is Cephaloneon pustulatum, Bremi, and is produced by 
Eriophyes laevis, Nal. 
(4.) On lower surface—rarely also ôn upper—occur patches of 
closely set hairs (Erineum alneum, Pers.) unicellular, with 
isa: thickened heads. The hairs, at first white, soon 
me rusty brown. Among them live the mites, Eriophyes 
items d sus, Fockeu 
Quercus. Mr. saei s list of galls observed in Kew Gardens on 
the species of Quercus includes the few galls of the Cynipide or 
Gall-flies that I lieve noticed there, I shall therefore refer only 
to mae ones produced on leaves by acca and those of a gall- 
Q. pedunculata, Ehrh. 
(a.) A lobe is folded backwards and becomes thickened and 
discoloured with yellowish spots. Below it lie larvæ of a midge, 
Mucrodiplosis dryobia (F. Löw w). 
(^.) A narrow portion in the sinus, or on one side of a lobe, 
becomes folded upwards and slightly discoloured and thickened. 
Below it lie larve of a midge, Macrodiplosis volvens, Kffr. 
(c. Lower surface cuc hairy along the veins, due to 
mites,— Eriophyes quercinus, Can 
Fagus sylvatica, L. 
(a.) On upper surface of leaves rise usually several galls of the 
form of a rifle-bullet, up to 3 mm. in height and covered with 
short hairs. They fall off, leaving a round thickened ring in the 
(Has end are the work of a gall-midge, Oligotrophus annulipes 
(b.) Leaves near tip of twig remain small, become SRiokened 
and deeply folded yc the veins, and are covered with hai 
which change from grey to pale brown. AMD ong these live gall. 
mites, probably Eriophyes stenaspis, Nal. 
