Zapatella grahami Pujade-Villar & Melika, sp. n.

Gall (Figs 17–18). Acorn galls. Individual chambers located in the acorn cup, often between the cup and the seed. Usually there is one gall per acorn, but sometime two or three.

Biology. Only the sexual generation is known and it induces galls on Quercus costaricensis. Galls were collected in February and later in October in forests located above 3000 m altitude, adults emerged immediately after the galls were collected, in February and October.

Distribution. Currently known only from Costa Rica (Cerro de la Muerte).

Etymology. In recognition of the continuing contribution of our friend, prof. Graham N. Stone (Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, Scotland) to research on oak gallwasps.