Kernel Flower Gall Wasp (bisexual generation)

Dryocosmus grumatus

Cynipidae

Callirhytis

Quercus agrifolia

California

Quercus kelloggii

Oregon

Quercus wislizeni

Cynipid Galls of the Pacific Slope

New American Cynipid Wasps From Galls

Heterogony in Callirhytis serricornis (Kinsey) (Hymenoptera: Cynipoidea)

Callirhytis serricornis (agamic)

Dryocosmus grumatus, new species

Host.--Quercus wislizeni These galls also occur on Quercus agrifolia and Q kelloggii.
Gall.-- A smooth, bare, ellipsoidal gall about 3 mm in diameter attached to midrib on under side of the leaf in the fall and bearing a little fleshy knob on its summit exactly like the gall of rileyi (Ashmead) in the eastern United States. 

Dryocosmus grumatus Weld

Quercus agrifolia, Quercus wislizeni
Leaf galls, Detachable
Single, on under side, bare. Sept.

Quercus kelloggii
Leaf galls, Detachable
Single, on under side, smooth, Sept.

[Photo caption]
Fig 133. Q agrifolia. Occurs on Q wislizeni and kelloggii also. Develop in July. Drop in August. Adults emerge in spring.

Callirhytis serricornis

Experimental rearings and field observations have shown that the cynipid wasp Dryocosmus grumatus Weld is actually the alternating, agamic generation of Callirhytis serricornis (Kinsey). Since Callirhytis serricornis was described in 1922, the name has priority over Dryocosmus grumatus, described in 1952. 

Callirhytis serricornis
(Andricus serricornis)

Hosts: Quercus agrifolia, wislizeni

These green and red galls, about 1 mm across, are round, with a cap or collar on top of each rounded base. 