Holcaspis sileri Bassett

Gall. (Plate VIII, Fig. 12.) Singly at the tip of twig of oak (Quercus undulata). Somewhat bud-shaped, ovate, or elongate. Attached by a broad base to the twig near the bud, pointed at the apex with part of a leaf growing from it or at the sides. Rough and apparently green when fresh, brown and pubescent when dry. Internally the gall is hard with the larval cell closely imbedded, but separated from the gall. Length about 9 mm. Width about 5 to 6 mm.

Habitat. Southern Utah.

The adult of this species has not been examined by me. It is in the collection of the American Entomological Society and two type galls are in the American Museum of Natural History.