ON THE COMMON OAK 
167 
Hymen- 
optera 
5 / 
i } 
) I 
A rounded pustule about 3 mm. in diameter, showing 
on both surfaces of the leaf, but a little less pronounced 
below ; solitary, glabrous, pale green or brownish, marked 
with striae radiating from the central papilla. There is no 
internal gall. Imago, June, I. (Plate V. 8, c.) 
Neuroterus vesicator Schl. 249 
Syn. Spathegaster vesicatrix Schl. 
Connold, Oak Galls, pi. 55 ; Plant Galls, fig. 218. 
Houard, No. 1353. Adler and Straton, Alternating Gener¬ 
ations, pi. 1, fig. 3a. 
On the under surface of the leaf, gall resembling a 
minute silk button, 2 to 3 mm. in diameter and about 1 mm. 
high. There is a well-defined depression on the upper 
part of the gall, which is brownish, veined with red, and 
covered with filiform silky hairs radiating from the depres¬ 
sion to the margin. Often densely gregarious. Imago, 
March, II. (Plate V. 9, e.) 
Neuroterus vesicator, form numismatis 250 
Syn. Neuroterus numismatis Oliv. 
Connold, Oak Galls, pi. 49 ; Plant Galls, fig. 212. 
Houard, No. 1340. Adler and Straton, Alternating Gener¬ 
ations, pi. 1, fig. 3. 
In the axillary and terminal buds and on the leaf mar¬ 
gin. Gall cylindrical, about 4 mm. long, greenish-yellow, 
becoming tinted with red; the surface covered with little 
vesicular hairs, which give it a finely granulated appear¬ 
ance. Imago, May, I. (Plate XXII. 9.) 
Dryophanta verrucosa Schl. 251 
Syn. Spathegaster verrucosus Schl. 
Connold, Oak Galls, pi. 42 ; Plant Galls, figs. 194, 217. 
Houard, No. 1349. Adler and Straton, Alternating Gener¬ 
ations, pi. 2, fig. 16c*. 
On the midrib and lateral veins on the lower surface 
of the leaf, attached by a very short stalk. Gall 
spherical, markedly flattened at the poles, diameter 
7 mm., height 5 mm. ; green or brownish, shining, 
often tinted red, becoming hard. Scattered. Imago, 
October or November, I. (Plate XXII. 12.) 
Dryophanta verrucosa, form divisa 252 
Syn. Dryophanta divisa Hartig. 
Connold, Oak Galls, pi. 42; Plant Galls, fig. 204. 
Houard, No. 1328. Adler and Straton, Alternating 
Generations, pi. 2, fig. 16. 
In dormant adventitious buds of the trunk and branches. 
Gall very minute, about 2 mm. Long, greenish-grey, pointed, 
