Callirhytis ventricosa

Quercus cinerea [incana], falcata, ilicifolia, imbricaria, laurifolia, marilandica, myrtifolia, nigra, phellos, velutina
Stem galls, detachable
Conical, short-pubescent, sessile, single or small cluster bursting out of bark on trunk or twigs, green when young in May, turning brown and dropping in June.

[Photo caption]
144 On Q imbricaria. has been seen on all the red oaks except Q texana [buckleyi]. Green when growing, in May, turning brown and dropping in June (DC) or July (IL). Adults emerged the next spring May 23 (FL).

145 On Q coccinea. June 16 at Ft Sheridan IL.

Callirhytis quercus ventricosa n. sp.

Galls growing in clusters from three or four to a dozen together on the limbs and occasionally on the trunks of young shrub oaks. They are cone-shaped, truncate at the base, the apex often prolonged in a slender, recurved point. They are from four to five- eighths of an inch long, and from one-fourth to three-eighths in diameter at the base. When green, often of a deep red color; when dry, brown or black; very hard, enclosing a nearly free larval cell like that of C. q. globulus. Fitch.

My galls were collected in June. The flies were found to be fully developed in October. They were cut out, else they would probably have remained in the galls until spring.

Callirhytis quercusventricosa (Bassett 1864)

Hosts: Quercus inopina, myrtifolia

[Asexual generation detachable stem gall found in Florida in the spring.]