CATALOGUE OF BRITISH PLANT-GALLS 159 
Acari 
Fungi 
Diptera 
Acari 
1 y 
larva. The greater part of the midrib is often involved, 
the galls coalescent, and the leaf deformed. 
Perrisia carpini F. Low 21 i 
Syn. Cecidomyia carpini F. Low. 
Connold, Plant Galls, fig. 139. Houard, No. 1045. 
Slight swelling in the angle between the midrib and a 
lateral vein. The depression on the under surface of the 
leaf is covered with abnormal hairs. 
Eriophyes tenellus Schl. 212 
Connold, Plant Galls, fig. 141. 
Leaf atrophied and wrinkled in a remarkable manner ; 
the wrinkling extends from the margin to the midrib 
along the lateral veins, which are slightly swollen below. 
Eriophyes macrotrichus Nal. 213 
Legnon confusion Bremi. 
Connold, Plant Galls, fig. 140. Houard, No. 1046. 
Dense mass of short twigs with atrophied leaves, 
usually seated upon a bough, forming the growth known 
as a “witch’s broom.” 
EXOASCUS CARPINI Ros. 214 
Connold, Plant Galls, fig. 137. 
FAGACEAE 
Corylus Avellana Linn. in. Hazel. 
Staminate catkins swollen, more or less pyriform, with 
enlarged, smooth scales. Larvae white, gregarious. 
STICTODIPLOSIS CORYLINA F. Low 215 
Syn. Diplosis corylina F. Low. 
Connold, Plant Galls, p. 245. 
Masses of deformed twigs, forming a “witch’s broom.” 
The growth may be dense or straggling ; the leaves are 
stunted, and the nodes are always swollen. 
Eriophyes avellanae Nal,, var. ? 216 
Connold, Veg. Galls, pis. 14, 15. A very doubtful diag¬ 
nosis. 
Staminate catkins swollen, more or less pyriform, 
scales enlarged and rough. 
Eriophyes avellanae Nal. 217 
Connold, Plant Galls, fig. 134. Houard, No. 1053 (with¬ 
out name). 
Bud deformed, hypertrophied, forming an almost 
spherical yellowish or reddish-brown mass about 8 to 10 mm. 
in diameter, composed of swollen scales, the innermost 
