Andricus formosalis, new species

Host. — Quercus emoryi

Gall (pl. 2, fig. 13). — Ovoid, 8 by 5 mm., whitish with a velvety surface when young, a button-shaped mass of pubescence at apex. Produced in clusters of 3-5 on the previous year's growth early in spring, dropping to the ground early in July. A cross section of a mature gall shows a larval cavity in the center, 2 mm. in diameter, the thick surrounding wall cellular and traversed by 11-13 rather large canals.

Habitat. — The type material was collected at Wolf Creek Camp near Prescott, Ariz., July 13, 1935, by Mrs. N. W. Capron. Living adults were cut out of the galls on April 15, 1936. She also sent old galls from Young, Ariz., and clusters just starting to develop on February 4 from Nogales. The writer collected these galls at Oracle, Nogales, Patagonia, and in the Huachuca Mountains, Ariz.

Andricus formosalis

Quercus emoryi
Stem galls
Detachable
Fig 65.