Feron discularis (Weld, 1926), comb. nov.

Gall (Figs 187–188). Disk-shaped, about 6 mm in diameter by 1 mm thick, single or scattered in small numbers on underside of leaf in autumn. The upper surface is slightly concave, the edge sinuate, the margin reflexed nearly to the leaf surface. The transversely placed larval cell occupies the full height of the gall. Exit hole on top surface (Weld 1926).

Biology. The asexual generation only is known, inducing galls on Q. garryana (section Quercus, subsection Dumosae). Galls mature in September, adults were cut out in November.

Distribution. USA: CA (Weld 1926).

Andricus discularis

Quercus garryana
Leaf galls, detachable

Fig 153. Q-garryana. Diameter 6.0 mm. Adults were cut out Nov. 10 from galls collected in early September (Sequoia National Park)

Diplolepis discularis, new species

Host. — Quercus garryana

Gall (fig. 34). — Disk-shaped, about 6 mm. in diameter by 1 mm. thick, single or scattered in small numbers on underside of leaf in fall. The upper surface is slightly concave, the edge sinuate, the margin reflexed nearly to the leaf surface. The transversely placed larval cell occupies the full height of the gall. Exit hole above.

Habitat. — The type material was collected September 8, 1922, in Sequoia National Park, Calif., near the Cedar Creek checking station on the road to Giant Forest on the Kaweah form of this Oregon oak. Living flies were cut out of the galls on November 10,

Andricus discularis
[Page 110]

The striking unisexual galls have been found on the ventral surface of leaves of Oregon oak in October. These flat, disc-shaped galls measure 4-6 mm across and are dull pink to rose. They occur on veins, with one or more galls per leaf.

Host:
Quercus garryana