Andricus columbiensis Melika, Nicholls & Stone, sp. nov.

Diagnosis. The galls of A. columbiensis on Q. garryana resemble those of A. occultatus (Weld, 1926), previously known from California, which induces galls on Q. douglasii, Q. dumosa, Q. lobata. Asexual A. opertus (Weld, 1926), also known from California, induces similar cryptic bud galls on Q. douglasii and Q. lobata.

Gall (Fig. 100). A cryptic bud gall, located within a slightly swollen terminal or lateral bud; gall contains a single larval chamber (occasionally two) at base of bud within the meristematic tissue, below the point at which the bud scales are attached.

Biology. Only an asexual generation is known, which induces cryptic bud galls on Q. garryana. Adults emerge in late autumn.

Distribution. Canada, British Columbia, southern Vancouver Island and adjacent Gulf Islands.