Femuros repandae Kinsey, 1937
Femuros lusum Kinsey (1937a: 66)

Gall (Figs. 5d-e). Galls are spherical (10-20 mm in diameter), distorted mainly by the bracts, deformed leaves, and deformed (widened) petioles that are closely fused on the surface. They are located at the terminal part of the main or lateral twigs, solitary, rarely forming groups of two or three galls. They are unilocular, sessile, and hard. They usually have normal scales at the base. The surface is similar to the bark of the branch when mature; initially, they are greenish or have reddish tones. The larval chamber is central, separable, with a hard and thick wall (up to 7 mm in diameter); between the larval chamber and the external wall there is a spongy tissue, looser near the larval chamber.

Hosts. Quercus repanda Bonpland, 1809, and Q. laeta (Quercus section).

Biology. Only the asexual form is known. The galls develop from June and by December-January they already have a reddish color; adults emerge in April.

Distribution. Cited from the states of Hidalgo and Mexico City. This is the first record for Santa Fe (Mexico City) and the first record on Q. laeta.

Femuros repandae comb. rest.

Femuros repandae, n. sp.
Agamic form

Gall. — As described for the genus. Possibly averaging smaller than the gall of ruidum; up to 17. mm,, averaging nearer 14. mm. in diameter.

[Description for the genus: Large, globular, monothalamous bud galls. Galls quite regularly spherical, distorted chiefly by the bracts, deformed leaves, and deformed (broadened) petioles which are closely fused on the surfaces; up to 23, averaging near 15. mm. in diameter; the surface of the gall similar to the bark covering young twigs, touched with red when young, becoming silvery and purple brown with age. Internally more or less solid, with a compact but soft tissue filling the outer third or half of the gall, this giving way to a more spongy and open tissue which supports the larval cell; larval cell central, inseparable, thick- and hard-walled, up to 7.0 mm, in diameter even in rather small galls. Galls terminal on main or side twigs, abruptly rising from the twigs, sessile but not more solidly attached than a normal bud; usually showing normal bud scales at base, occasionally with a deformed or small leaf or even a rare stem developing from the aborted structures on the surfaces of the galls; occurring singly or (rarely) in clusters of two or three galls.]

Host. — Quercus repanda [Quercus rugosa?], the lowest dwarf among the high mountain oaks in this area.

Range. — Mexico: Mexico City, 32 E, 10.600’ (types). — Hidalgo: Pachuca, 7 N, 8700’. — Probably restricted to dwarf oaks of the repanda group in the mountains of Mexico (state), and perhaps through Morelia.

Life History. — Adults: April 16, 24

This insect occurs on the dwarf oaks of the repanda, group in the high mountains rimming the Valley of Mexico. On the other oaks of the same area, F. ruidum represents the same complex of insects.