Loxaulus trizonalis sex gen

Quercus chrysolepis
Stem galls, detachable
Gall similar to the above.

Loxaulus trizonalis, new species
sexual generation

Host. — Quercus chrysolepis

Biology. — The flies were reared from a lot of galls which were supposed at the time of collection, April 18, 1918, to have all been those of a species of Disholcaspis. When these flies emerged July 15-August 1, 1918, they were at first thought to be guest flies in the above gall whose maker does not emerge until late in the fall. But these flies have not at all the structure of guests and the gall from which they came is therefore not recognized or here described.

Habitat. — The type locality is Camp Baldy, Calif. Paratypes are from galls collected on the road from Holland, Oreg., to the Oregon Caves July 21, 1922, the flies emerging about August 1.

Loxaulus trizonalis Weld

Distribution.--CA

Biology.--Alternate unisexual and bisexual generations are known. The unisexual generation induces acorn galls while the bisexual generation stimulates stem galls on Quercus chrysolepis. The adults of the bisexual generation emerge from the stem galls in April and oviposit into young acorns; galls of the unisexual generation mature in September and the adults emerge the subsequent spring in March or remain in the galls for one year more and emerge in spring of the second year.