Synophrus olivieri Kieffer, 1898

Host plants. Israel: Q. ithaburensis . Elsewhere: Q. suber and Q. ithaburensis .

Host gall-wasp: Unknown.

Life history. Known only from the sexual generation, which develops in extremely hard, multi-chambered galls of irregular shape, up to 30 mm in diameter, of the same color of the branch (Fig. 42; Sternlicht 1968b, Figs 10–11).

Phenology. Galls develop in spring and adults emerge from them in March of the following year.

Distribution. Israel: Mezar, Bet Keshet Forest, Hosha’aya, Alonim, Tiv’on, HaSharon Forest. Elsewhere: North Africa, Asia Minor.