Andricus schickae Nicholls, Melika & Stone, sp. nov.
Asexual generation

Diagnosis. Galls closely resemble those of Andricus occultatus, but the adults are different. Also closely resembles A. columbiensis.

Gall. (Fig. 232). A cryptic unilocular gall within a swollen terminal or lateral bud, whose scales remain intact and surround the gall. The gall is ca. 2–2.5 mm long and 1–1.5 mm in diameter, and consists only of the larval chamber, with a thin woody wall.

Biology. Alternate asexual and sexual generations are known. The asexual generation bud galls develop on Q. garryana, mature in November, adults emerge the following spring. The sexual generation galls (Figs. 233–234) were found on Q. lobata leaves in late March-April; adults emerge soon afterwards. We expect both generations can be found on both Q. lobata and Q. garryana.

Distribution. USA, California (Los Molinos, Stockton, Cosumnes River Preserve) and Canada, British Columbia (Victoria).

- George Melika, James Nicholls, Warren Abrahamson, Eileen Buss, Graham Stone: (2021) New species of Nearctic oak gall wasps (Hymenoptera: Cynipidae, Cynipini)^©