Disholandricus lasius (Ashmead 1869) comb nov.

Callirhytis lasius
Andricus lasius
Disholcaspis lasius
Andricus lasius var. areolatus syn. nov.
Andricus lasius var. sublasius syn. nov.

Hosts: Quercus vacciniifolia, chrysolepis

Round, hairy, multilocular, detachable galls on midrib, underside of leaves. Sometimes galls develop on large lateral veins and sometimes the leaf disappears.

[Photos of the gall appear on page 60 of the pdf]

Gall. (Figs 179–181). Round, hairy, multilocular, detachable galls on midrib, underside of leaves. Sometimes galls develop on large lateral veins and sometimes the leaf disappears. Mature galls are dirty beige colored, golden yellow (occasionally with a reddish tinge) with brown hairs when young. Hairs are 3 to 4 mm long; the gall mass up to 10 mm in diameter. Up to six larval chambers are radially located around the point of attachment (Russo 2006).

Biology. The asexual generation is only known, inducing galls on Q. vacciniifolia and Q. chrysolepis. Galls develop in summer-autumn, mature in late autumn; adults emerge from January to March

Range: AZ, CA

Andricus lasius (Ashm.).

Quercus chrysolepis
Leaf galls, separable from leaf intact
Woolly, on basal third of leaf. Poly.

141. Q. chrysolepis. Polythalamous • Develop in August on leaves of the current year. Adults were reared Dec. 50 (Camp Baldy), had emerged and died by Feb. 9 (Mt. Wilson).

Andricus lasius

Quercus wilcoxii [chrysolepis]
Leaf galls
Detachable
Fig 84.

Callirhytis lasius, new species.

A hemispherical, hard gall, occurring on the upper or lower surface of the leaves of Q. chrysolepis, and covered with a pale, yellowish wool, more or less ringed with ferruginous, some being entirely rust-red; it is polythalamous and in general appeareance not unlike A. flocci, Walsh, but the larval cells are held closely together, embedded in the hard substance composing the gall. Diameter from 5 to 9 mm.

Numerous specimens; reared by Mr. Albert Koebele, at Placer County, California, December 19, 1885, from galls on Quercus chrysolepis; others reared January 2, 1882, and December, 1885.

Andricus lasius
(Disholcaspis lasius)*
Hairy-gall wasp

Hosts: Quercus chrysolepis

This cynipid wasp induces round, hairy, polythalamous, detachable galls on the ventral midrib or lateral veins of leaves of canyon live oak.

Andricus lasius

Hosts: Quercus chrysolepis

GALL. — A more or less globular, wool-covered, leaf gall. Polythalamous, with a half dozen or fewer cells. Roughly globular, flattened basally, 10. mm. in diameter, covered with short, dense wool about 2. mm. thick, the wool at first bright golden brown, weathering light gray or black. Internally hard, woody, solid except for the larval cells, which average 2.5 x 1.5 mm., and which are arranged rather radiantly about the mid-point of the base. Attached by a slight projection of the woody gall to the mid-vein or often to the petiole, occasionally two together, on either surface, usually on the under surfaces of leaves of Quercus chrysolepis.

RANGE. — California: El Toro to Ukiah and Dunsmuir. I cannot fix characters which will distinguish the galls of the varieties, for they are very similar. Here is an instance of the physiologic measure of the insect varying less than does the morphologic. Morphologically the varieties are also very similar. What differences do exist are correlated with the occurrence of the faunal areas.

[Kinsey goes on to describe several varieties that do not differ by host or gall morphology, only adult morphology and range; see paper for details]