Callirhytis petrina

Quercus hypoleuca [hypoleucoides]
Acorn galls
Gall like Fig 12.

CALLIRHYTIS PETRINA. new species

Host. — Quercus hypoleuca Engelmann.

Gall. — A few loosely connected, thin-walled woody cells inside the acorn. Found in summer in acorns of current season's crop.

Habitat. — The type material was collected in Sabijio Basin in the Santa Catalina Mountains, Arizona. June 28. 191S. Three living adults were cut out December 2. 1919. Normal emergence is prob- ably in the spring. Acorns similarly affected were seen in the Huachuca Mountains also.