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288
Bulletin American Museum of Natural History
[Vol. XLVI
extending slightly along the margin; first abscissa distinctly angulate but without a projection, and slightly infuscate where it joins the subcosta. Length: 1.5-2.2 mm., averaging nearer 2.2 mm.
- Galls (Pl. XXIV, Fig. 8).—Small, fleshy-walled capsules imbedded in the leafblade. Monothalamous. Spherical or more elongate, about 6. mm. in diameter (perhaps larger when fresh), leaf-green, drying brown, projecting about symmetrically from either surface of the leaf. The walls are.thick, succulent, the cavity (in shriveled galls) about oval, 2.×3. mm., with a distinct larval cell lining, but the cell inseparable (at least in the shriveled gall). On the very young leaves of Quercus Kelloggii.
- Range.—California: Santa Rosa and Redding.
- Types.—Six females and twenty galls; holotype female, paratype females, and galls in The American Museum of Natural History; paratype females and galls in the author's collection, and galls at Leland Stanford University and the U. S. National Museum. Labelled Santa Rosa, California; March 16, 1920; Kinsey collector. Some of the adults were cut from old galls and are imperfect.
At the time the galls were collected they were very fresh and succulent, on the very young, unfolding leaves of the black oaks, but inasmuch as adults emerged from some of these galls, in spite of their immediate shriveling on collecting, it would appear that the insects complete their development in a very short period in the early spring. Such species of cynipids are usually bisexual, so the male may yet be discovered for this species.
Andricus serricornis, new species
Plate XXIV, Figure 3