Neuroterus fusifex (sexgen)

Neuroterus fusifex Pujade-Villar and Ferrer-Suay n. sp. 
(Figs 1–3)

Gall (Fig. 4a-b). Multilocular gall, located in catkins, ovoid (7-12 mm long and 5-7 mm wide). It is caused by the hypertrophy of the axis with anthers of the some flowers are protruding. When young it is green and turgescent, which hardens and becomes violet-red at maturity. The surface is provided with a thin, dense whitish pubescence. Inside numerous rounds larval chambers (0.5 mm in diameter) are closely disposed ones together with each other, jointed with a hard consistency. The medullar space between larval chambers hardly exists.

Host plant. Quercus laeta Liebm. (section Quercus) endemic from Mexico. 

Distribution. Mexico (Cerro de las Campanas - Arenales, San Felipe del Progreso, Estado de México). 

Biology. Only the sexual generation is known. The galls appear in April on catkins. Adults emerge in the last April or early May. The galls fall to the ground shortly after although some can remain in the tree some more months.

Neuroterus fusifex Pujade-Villar and Ferrey-Suay n. sp.(Hymenoptera: Cynipidae): first record of galls on catkins in Mexico