Andricus discalis (Weld)

Quercus toumeyi, subturbinella [turbinella]
Leaf galls, Detachable
Fig 73 and 170

Diplolepis discalis, new species

Host.--Quercus undulata

Gall.--A thin disk, 3.6 mm in diameter on the under side of the leaf in the fall. Monothalamous, tan-colored, convex on upper surface, margin crenate, underside concave, the transversely placed larval cell occupying the full height of the gall. Exit hole on upper surface. Single or but few on a leaf.

Habitat.--Galls were collected and living adults cut out on November 1, 1921, in NM.

Andricus discalis
Little-disc-gall wasp

Quercus oblongifolia

These monothalamous galls are flat discs with a slight point in the center and are often tightly appressed to the leaf.

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

Gall (Fig. 173). A spangle gall, on the underside of leaf, 3.6–4.0 mm diameter, monolocular, yellow-green when young and growing, turn brown when mature, with raised rim and raised center, convex on upper surface, underside concave, the transversely placed larval chamber occupying the full height of the gall. A single or a few galls on one leaf (Weld 1926).

Biology. The asexual generation is only known, which induces galls on Q. pungens (section Quercus, subsection Polymorphae), Q. arizonica and Q. turbinella (both section Quercus, subsection Leucomexicana). Galls mature in late autumn; adults were cut out from galls in November; probably overwintering in galls and emerging in spring.
Distribution. USA: Arizona, New Mexico (Burks 1979).