Femuros lusum Kinsey, 1937

Gall (Figs. 5f-g). These develop on thin branches from growth buds. They are unilocular, of compact and woody consistency when mature, in the shape of a cylindrical cup, 8–18 mm in length and 7–15 mm in diameter, composed of two subunits; contracted in the upper and lower third. The upper end is depressed with a continuous edge. The immature gall is greenish with a purplish edge, upon maturing it acquires a brown color; the surface is covered by a fine brownish pubescence that remains on the mature gall. The internal larval chamber is located in the contracted part of the gall; it is globular, with a hard wall connected to the gall tissue. The emergence hole is located within the upper depression.

Hosts. Quercus rugosa and Q. laeta (Quercus section).

Biology. Only the asexual form is known. The galls develop in May-June and by November they are mature; adults emerge from early March to early April of the following year.

Distribution. Cited for the state of Michoacán. This represents the first record for Mexico City (Santa Fe) and the first record on Q. laeta.

- Uriel Barrera-Ruiz, Victor Cuesta-Porta, David Cibrian-Tovar, Aitor Martinez-Romero, Juli Pujade-Villar: (2021) Avispas agalladoras de los encinos de Santa Fe (Ciudad de México, México) (Hymenoptera, Cynipidae: Cynipini; Fagaceae)^©