Andricus wheeleri

Quercus arizonica, oblongifolia, toumeyi, subturbinella [turbinella]
Stem galls
Stem swellings or cells under bark
Fig. 37. Thickened bark, often lobed.

Andricus wheeleri

Irregularly rounded or elongate, somewhat potato-shaped, polythalamous oak twig gall, length 15 to 30 mm, diameter 14 to 20 mm, on unknown scrub oak. Beutm. '07, p. 464

Andricus wheeleri sp. nov.

Gall.--Polythalamous. Brown with a grayish tint, hard and woody. Irregularly rounded or elongate, somewhat potato-shaped. Measures from about 14 to 20 mm. in width and from 15 to 30 mm. in length.

Habitat.- Coconino Forest, rim of the Grand Canion, Arizona; altitude 7,000 feet. (William M. Wheeler).

The galls of this species occur around the smaller twigs of an unknown species of scrub oak. They somewhat resemble Andricus medullae and batatoides Ashmead, but the fly is different. The flies may be distinguished by the divergent anterior lines, absence of the median groove from the scutellum, and rufous color. It is allied to Andricus medullae Ashmead.

Andricus wheeleri
(Amphibolips wheeleri)*
Knobby-stem-gall wasp

Hosts: Quercus oblongifolia, arizonica, toumeyi, turbinella

While there are many other species that induce integral stem galls, the lobes of this one are distinctive.