WELD 1501. Plate 37, fig. 33.

Host.— Quercus agrifolia Nee, Quercus wislizeni A. de Candolle Quercus californica Cooper.

Gall — Abrupt oblong swellings at base of sprouts which are only a few millimeters in diameter. The gall may measure 25-35 mm. in diameter by 35-75 mm. long. It is hard and woody when dry, covered with normal brown bark which is not much thickened. Cells radially arranged in pockets in the wood. Exit holes with a characteristic smooth ring.

Habitat. — The writer has collected old galls on Quercus wislizenii on Mount Tamalpais, in San Gabriel and San Antonio River canyons in San Gabriel Mountains, in Ojai Valley, and at Santa Margarita, California; on Quercus agrifolia at Newhall, near Carpinteria, at Santa Margarita, Paso Robles, Paraiso Springs, Monterey, and Los Gatos; on Quercus californica at Dunsmuir and in Sequoia National Park. Fresh galls nearly full grown but too immature for rearing were seen only once at Monterey, on May 11, 1918.

Holocynips humicola (Kinsey).

Quercus agrifolia, kelloggii, wislizeni
Fig 33. Abrupt, woody, dia up to 30 mm.

Fig 33. Q. wislizeni. Occurs also on Quercus agrifolia and kelloggii. At base of sprouts. Adults have been cut out in late November; emerged April 25,27, 28 (California Redwood Park).

Andricus humicola, new species

Gall (P1. XXIV, Fig. 13).-Large, irregular, tuber-like, woody swellings of the bark and new wood of roots. Agglomerate. The swellings are very irregular, smooth and rounded when fresh, roughening with age; the fresh bark covering is more reddish brown than on the normal roots; length up to 10.5 cm., the diameter 7.5 cm. on large galls. Affecting both wood and bark, including wood below the normal line of the bark; larval cells lying toward the bark, oval, 3.5 by 4.5 mm., with a thin, distinctive tissue lining the cells, but not separable from the wood. On the sides of large roots,well below the surface of the ground, on Quercus Kelloggii.

RANGE.-Oregon: Ashland.

A cave-in of a railroad embankment had exposed these galls. The single female was found running over the surface of the galls, and was identified as the producer of these by recovering an immature adult which had not emerged from the galls. Almost all of the insects had emerged, but at least one was still alive on April 6. Very likely the species is agamic, at least in this generation.