Andricus robustus, new species

Host.--Quercus stellata

Gall (fig. 18). — A midrib cluster on under side of leaf in fall, the galls dropping to the ground when mature. The individual galls are somewhat globular, tapering to a pedicel at base and pointed with a slight scar at apex, greenish and mottled with white when fresh, turning brown during winter on ground. This is the gall described in connection with the fly of Cynips vacciniformiis Beutenmueller which seems to have come from an accidentally included gall of a different sort in the breeding cage.

Habitat. — The type material was collected at Arlington, Texas, November 3, 1917, when the galls were still dropping to the ground. On December 1, 1919, living flies (that would probably have emerged in spring of 1920) were cut from the galls. Some of the same lot of fresh galls were sent to William Beutenmueller, who reared adults January 10, February 14, 15, 20, 21, 1919, and more in February, 1920. Paratype flies were cut out December 1, 1919, from galls collected at Texarkana, Ark., in October, 1917. The galls have been collected also at Webster Groves, Poplar Bluff, and Ironton, Mo.; Hoxie, Little Rock, and Hot Springs, Ark.; Palestine, Cuero, and Austin, Tex. ; Cottondale, Fla.; Wasliington, D. C.; Falls Church, Va. Galls collected at Washington in late October, 1923, gave adults February 22, March 1, 14, 17, 1925, and these have been included among the paratypes.

Andricus robustus

Quercus breviloba
Leaf galls, detachable
Midrib cluster on under side of leaf in fall.

Quercus stellata
Leaf galls, detachable
Midrib cluster on under side of leaf in fall, each pointed at apex, dropping when mature.

[Photo caption]
On Q stellata. Also on Q breviloba. Adults emerged Feb 22, Mar 11-19, 1925 and one was cut out Jan 11, 1926, from galls collected in Oct 1923 (DC).

Adleria vacciniiformis

Quercus stellata
Leaf galls, detachable
Midrib cluster of thick-walled, one-celled galls shaped like a huckleberry or hackberry fruit, with nipple at apex, stalk 1-2.5 mm long, gall 4-7 mm in dia. Entered from lit.

[Photo caption (no photo)]
Globular, 4-7 mm in dia, with a petiole in a loose midrib cluster on Q stellata. Austin TX.

Cynips vacciniiformis sp. nov.

Gall. — In clusters on the midrib of post oak (Quercus minor [stellata]), Monothalamous and moderately thick walled with a large round larval chamber. Globular and almost like a huckleberry or fruit of hack- berry (Celtis occidentalis) with a more or less distinct nipple at the apex and long petiole or stem at the base by means of which it is attached to the leaf. Brown when old and probably green when fresh. The outer surface is slightly roughened or almost smooth. Diameter 4-7 mm.; petiole 1-2.50 mm. long.

Habitat. — Austin, Texas.

The gall somewhat resembles that of C. dimorphus, but is larger and more globose. It occurs in clusters like dimorphus, but the galls are less closely together and not pressed out of shape, each individual gall retains its globose shape. The male is not known.

Cynips vacciniiformis

Globose, clustered, monothalamous, midrib gall with a more or less distinct nipple apically and a long stem basally, brown when old, probably green when fresh, diameter 4 to 7 mm, stem i to 2.5 mm, resembles a huckleberry, on post oak.