274 ' MOSLEY: YORKSHIRE GALLS. 
On Fraxinus excelsior. 
Leaflets folded and thick, like a pea-pod. Caused by a midge 
(Cecidomyia acrophila). Wakefield, Huddersfield, Anston. 
Midrib thickened. Caused by a .midge (Déplosis betularia). 
Anston. 
On Galium verum. 
Galls on stems and flower-stalks. Caused by a midge (Cec#domyia 
galit), Thornhill. 
On Glechoma hederacea. 
*Small hairy pyramidal galls on top side of leaf, falls off and leaves 
ahole. Caused bya midge (Cecidomyia bursaria). Common. 
On Hypericum humifusum. 
Terminal leaves swollen. Caused by a midge (Cecidomyia serotina). 
Huddersfield. 
On Lamium galeobdolon. 
Pouch-like hairy galls on young shoots. Caused by a midge 
(Cecidomyia galeobdolontis). Mr. Soppitt has brought me 
this from Bradford 
On Polygonum persicaria. 
_ *Leaf edges thick and rolled under. Caused by a midge 
(Cectdomyia persicarig). Kirkheaton. 
On Pinus abietis (Spruce). 
*Cone-like galls on young shoots. Caused by an aphis (Chermes 
abietis). Generally common. 
On Populus 
*Pea-like red galls on young shoots, petiole, or midrib. » Caused 
by an aphis (Pemphigus bursarius). Common. 
On Pyrus malus (Apple). 
*Bark swollen into irregular knobs. Caused by an aphis called 
American Blight (Schizoneura /anigera). Common. Not 
really a gall, being solid, and the insects living outside. 
Leaf edge thick, red, and folded under. Caused by an aphis 
(Aphis malt). 
On Quercus robur. (All produced by insects belonging 
Cynipide). 
*Pea-shaped, one-celled galls on roots (Biorhiza aptera). Sent a 
from Bradford se Mr. Soppitt. 
*Large woody, many-celled excrescences on exposed roots 
(Aphilothrix vadics) Generally common. 
Small silky, button-shaped galls, with centre depressed, on under 
side of leaf (Veuroterus numismatis). Generally common. 
Naturali 
