Feron cylindratum (Kinsey, 1937), comb. nov.

Xystoteras cylindratum Kinsey 1937a: 77, female, gall.
Liodora cylindratum (Kinsey): Melika & Abrahamson 2002: 160 (synonymized Liodora with Andricus); Pujade-Villar 2003: 234 (mentioned this combination).
Andricus cylindratum (Kinsey): Pujade-Villar 2003: 234.

Gall (Fig. 161). Small, naked, hollow cylinders scattered on the underside of leaves. Each gall is regularly cylindrical, a bit swollen below the tip, a bit restricted basally, up to 5.0 mm in length and 2.5 mm in diameter. The exterior of the gall fairly smooth, entirely naked except for a blue or purplish scurf. The body of gall hollow, open at top, the open cavity penetrating to a third or a half of the gall, separated from the larval cell by a thin partition; larval cell floored with a thicker partition beneath which another cavity is to be found. Young galls straw and light rose pink, sometimes touched more purple red, the whole touched with an ashy-blue scurf; older galls becoming burnt red to purple brown or dark, dirty brown. Each gall separated, often occurring in great numbers and dense masses, usually on under surfaces, rarely on upper surfaces of leaves.

Biology. Only the asexual generation is known, inducing galls on Q. deserticola (= Q. texcocana) (section Quercus, subsection Leucomexicana). Galls mature in autumn; adults emerge from February to mid-March.

Distribution. Mexico: Mexico City, Puebla (Kinsey 1937).

- Victor Cuesta-Porta, George Melika, James, A. Nicholls, Graham N. Stone, Juli Pujade-Villar: (2023) Re-establishment of the Nearctic oak cynipid gall wasp genus Feron Kinsey, 1937 (Hymenoptera: Cynipidae: Cynipini), including the description of six new species^©