Hymen- 
optera 
f» 
» f 
ON THE COMMON OAK 163 
Connold, Oak Galls, pi. 23 ; Plant Galls, fig. 188. 
Houard, No. 1283. Adler and Straton, Alternating 
Generations, pi. 2, fig. 12. 
On the male catkin. Gall minute, pyriform, about 
2 mm. high, inserted in the axis of the catkin between two 
stamens ; green at first, becoming brown, covered with 
erect white hairs. Usually solitary. Imago, June, I. 
(Text, Fig. 3.) 
Andricus pilosus Adler 232 
Connold, Oak Galls, pi. 13 ; Plant Galls, fig. 223. 
Houard, No. 1189. Adler and Straton, Alternating 
Generations, pi. 1, fig. 10 a. 
Bud greatly enlarged, resembling a hop-cone. The 
scales are imbricated and enlarged ; there is a cavity be¬ 
tween the central ones, at the bottom of which lies a 
small, hard, ovoid gall, containing the larva. Imago, 
spring, III., IV. (Text, Fig. 2.) 
Andricus pilotus, form fecundator 233 
Syn. Andricusfecundatrix Cam. ; Athilothrixfecunda- 
trix Hartig. 
Connold, Oak Galls, pi. 22; Plant Galls, fig. 186. 
Houard, No. 1214. Adler and Straton, Alternating 
Generations, pi. 1, fig. 10. 
On the male catkin. Gall ovoid, brown, minute, about 
2 mm. high, fixed to the base of the catkin, and covered 
with hairs 6 to 8 mm. long. The galls are often massed 
together on the catkin, and form a rounded or ovoid 
swelling about the size of a pea, entirely concealed in a 
covering of white or yellowish hairs. 
Andricus ramui.i Linn. 234 
Connold, Oak Galls, pi. 14 ; Plant Galls, fig. 224. 
Houard, No. 1186. Adler and Straton, Alternating 
Generations, pi. 2, fig. 13a. 
In a bud, an ovoid gall, about 5 mm. high, terminating 
in a point. It is glabrous, greenish, with a reddish 
tint on the upper part, which shows above the bud ; the 
broad base is buried in the bud. Within the fleshy 
covering there is a woody internal gall marked with 
longitudinal striae. In September or October the gall 
becomes detached ; the external part dries up and ex¬ 
poses the internal gall. Imago, spring, III. 
Andricus ramuli, form autumnalis 235 
Syn. Andricus autumnalis Hartig; Aphilothrix autum- 
nalis Hartig. 
Connold, Oak Galls, pi. 23 ; Plant Galls, fig. 183. 
Houard, No. 1219. Adler and Straton, Alternating 
Generations, pi. 2, fig. 13. 
