Andricus parmula n. sp.

Galls. — Minute, flat, saucer shaped, with a slight elevation in the center. This central portion is the small larval cell. They are sessile on the under side of the leaves of a species of oak unknown to me. They are only .08 of an inch across the top, and are of a fine red color. They are, in habit, very much like a species found on Q. alba, but are very much smaller, and the white oak gall is a pale blue color. I am not sure that the white oak gall has yet been reared. There are several other species that somewhat resemble this one. I received these galls from Mrs. E. H. King, of Napa City, California.

Dryophanta discus n. sp.
Galls. - Among the galls sent me several years ago by Mrs E. H. King, from Napa City, Cal., were a few specimens from which no insects appeared, but from which I removed three dead but perfectly developed individuals. The galls were circular, flat sessile disks growing in clusters on the under sides of the leaves of some species of oak, closely resembling Q. alba; but I am not sure this oak grows in that section. The galls are hardly one-eighth of an inch in diameter, and except in size and color might be taken for what is, I think, called the blue spangle gall, not uncommon on the white oak in the Atlantic States. It is smaller and lacks the blue color.
The shape suggests the trivial name.
https://www.biodiversitylibrary.org/page/7522412

Andricus parmula

Very small, flat, reddish, disc-shaped galls on the under side of leaves of Quercus lobata, about 3 mm. in diameter, slightly elevated in the center.

Andricus parmula

Quercus douglasii, dumosa, durata, engelmanni, garryana, lobata
Leaf galls, detachable
Fig 112. Red spangle, 2 mm, on under side.

Fig 112 On all the white oaks. Contain adults in November and December. Emerged Apr. 5 (Boulevard), Apr. 26 (Monrovia).

Andricus parmula

This cynipid wasp induces monothalamous, flat, disc-shaped, glossy, detachable galls on both sides of leaves of most white oak species. Galls measure up to 3 mm in diameter and have a narrow base of attachment and a smooth edge.

Feron parmula (Bassett, 1900), comb. nov.

Gall (Fig. 268). Minute, flat, sessile, saucer shaped, red spangle gall, on the underside of the leaves, 2.0 mm in diameter, with a slight elevation in the center, where the small larval cell is located (Russo 2006, 2021).

Biology. Only the asexual generation is known, which induces galls on Q. douglasii, Q. dumosa, Q. garryana, Q. lobata (section Quercus, subsection Dumosae), and Q. engelmannii (section Quercus, subsection Leucomexicana) (Burks 1979). Galls mature in April, adults emerge after soon (Russo 2006, 2021).

Distribution. USA: California (Burks 1979).