Hymen- 
optera 
i) 
ON THE COMMON OAK 169 
II. Cynipidae of which the Corresponding 
Generations are as yet Unknown 
( a) Sexual Generation only 
In the terminal buds, rarely in the axillary ones. The 
gall is formed by the welding into a mass 8 mm. high and 
5 mm. in diameter of the internal swollen scales. Green, 
then brownish. There are small and scarcely deformed 
scales on the surface. Imago, April or May, I. Alternate 
generation of Andricus ostreus (?) 
Neuroterus Aprilinus Giraud 257 
Syn. Spathegaster Aprilinus Giraud. 
Connold, Oak Galls, pi. 52; Plant Galls, fig. 191. 
Houard, No. 1215. Adler and Straton, Alternating 
Generations, pi. 2, fig. 19 a. 
On the male catkins. Gall ovoid, minute, 2 mm. high, 
1 mm. in diameter, formed at the extremity of the filament 
of a stamen, on the side of which the anthers form two 
longitudinal swellings. Green at first, becoming brown 
and covered with short yellowish hairs. Imago, May, I. 
Andricus amenti Giraud 258 
Connold, Oak Galls, pi. 5 ; Plant Galls, fig. 219. 
Houard, No. 1188. 
In an axillary bud. Gall 3 to 5 mm. in diameter, inserted 
by a very short stalk and bearing a little umbo at its apex; 
the surface, which is slightly wrinkled and yellowish-brown, 
bears some short whitish hairs. The internal gall is quite 
round, and lies in the centre of a cavity in the spongy 
tissue. Imago, February or March, I.; October or 
November, II. 
Andricus Clementinae Giraud 259 
Connold, Oak Galls, pi. 5 ; Plant Galls, fig. 176. Houard, 
No. 1279. 
In an axillary or terminal bud. Gall green or reddish- 
brown, about 6 mm. long, swollen and rounded below, 
subcylindrical above. Entirely covered with a felt of long 
snow-white hairs. Imago, spring, II., III. 
Andricus glandulae Schrenck 260 
Connold, Oak Galls, pi. 10 ; Plants Galls, figs. 178, 179. 
Houard, No. 1256. 
In an axillary bud ; the cupule is sometimes affected also. 
Gall rounded, often attaining the size of a hazel nut, pale 
yellow, covered with very numerous projections, 4 to 8 mm. 
long. Each projection is slender, erect or slightly bent, and 
