terior edge, moderately rugose, smoother basally, set with long hairs, a large, broad, sunken, smooth and arcuate furrow at base not divided into fovea; pronotum almost smooth and shining; mesopleurae smooth and shining, slightly aciculate in places. Abdomen: Piceous black; entirely smooth and shining except for a very few hairs at the base laterally; somewhat higher than long, highest posteriorly, second segment not covering half the area, segments two to four curved ventrally, only moderately produced dorsally; ventral valves at an angle of more than 60°. Legs: Brownish yellow, coxæ piceous; hairy; tarsal claws simple. Wings: Long, clear, set with fine hairs, margins ciliate, veins brown, subeosta, radius and basalis heaviest; areolet moderately small, cubitus continuous to the basalis but rather faint there; radial cell open, long, and narrow; second abscissa of the radius only slightly curved, the first abscissa slightly angulate, without a projection. Length: About 2.0 mm.,(?).
- Male.—Similar to the female, differing as follows: eyes large, protruding beyond sides of head; antennw wholly dark brown; parapsidal grooves less evident, especially anteriorly; abdomen very small, long-pedunculate; legs darker brownish yellow, the femora brownish piceous; areolet very small, the cubitus continuous to the basalis but very faint there Length: 2.2 mm. One male, apparently not wholly mature, has the thorax and abdomen lighter piceous, the length 1.5 mm.
- Galls (Pl. XXIV, Fig. 10).—Small, elongate capsules attached by a slender thread near the edge of the leaf. Monothalamous. The capsule is elongate, 5.-7. mm. long by 1.0-1.5 mm. wide; sharp-tipped but broadest near the tip, basally
slender tapered, continuing into a slender, thread-likestem 5.-12. mm. long, evidently a continuation of a vein of the leaf. The capsules are thin-walled and entirely hollow. Attached either near the edge or farther from the edge to very young leaves of Quercus Douglasii.
- Range.—California: Three Rivers, Oroville.
- Types.—Four females, two males, and many galls; holotype female, paratype female, male, and galls in the collection of The American Museum of Natural History; paratype adults and galls in the collection of the author; galls at Leland Stanford University and the U. S. National Museum. Labelled Three Rivers, California, March 23, 1920, and Oroville, California, April 1, 1920; Kinsey collector. The adults are all imperfect, and consequently it seemed desirable to utilize material from two localities in making the description.
This species appears very early in the spring, as soon as small leaves come out of the opening buds. At Three Rivers the galls were just maturing. It is likely that this is the short-lived bisexual generation of a species having an agamic alternate generation which takes all but one or two months of the year to develop. The species is in many respects related to species like Neuroterus irregularis (Osten Sacken), N. majalis (Osten Sacken), and N. resiculus (Bassett), but those species do not represent typical Neuroterus Hartig.
