Neuroterus papillosus Beut.

Cells isolated, more prominent on upper surface, scarcely projecting below, elliptical in outline, 1 mm. long, very numerous on leaf, exit hole below. On Q. bicolor in June. Adults emerge the last of June.

Neuroterus papillosus

Quercus bicolor, prinus [montana]
Leaf galls, integral
Elliptical cells in parenchyma in numbers in the fall, more prominent above. Exit hole on lower side.

[Photo caption]
On Q bicolor. Also on Q prinus [montana]. Adults emerged June 27-29 (IN); June 9 (DC).

Neuroterus papillosus

Parenchyma galls in the leaves of Quercus bicolor, agreeing with the type galls of this species, were collected at Chesterton, Ind., June 25, the adults emerging June 27-29, 1912. They occurred on the leaves of thrifty sprouts and on lower branches of a small tree near by. Exit holes on lower side. Galls were also taken at Wilmette, IL., June 9, 1913.

Neuroterus papillosus

Elongate, oval, blisterlike leaf swelling without a nipple, on the under side, length 1 mm, diameter .75 mm, on Q platanoides [bicolor]

Neuroterus niger variety papillosus Beutenmuller
bisexual form

Neuroterus papillosus
Neuroterus papillatus Beutenmuller

GALL. — Elongate, quite slender, small, with fairly well-defined boundaries, without a trace of a central point on either side. On Quercus bicolor (fig. 35).

RANGE. — Rhode Island: Providence (in Thompson coll.). New York: Bronx Park, New York City (Beutenmuller) ; West Nyack (Felt in N.Y. State Mus.). Probably confined to a more northeastern area of the United States, on Q. bicolor.

I have not been able to examine the types of this variety, and have made my descriptions from Q. bicolor material from West Nyack, New York, sent me by Dr. Felt. I have galls from the Thompson collection, from the typical host, from Providence. These agree with Beutenmuller’s figure in being narrowly elongate, and quite distinct from the more circular galls of niger or perminimus. The cynipid fauna of Q. bicolor is usually unique, and it is not likely that this variety occurs on any other host.

Neuroterus papillosus sp. nov.

Gall. (Plate X, Fig. 2.) In numbers on the leaves of swamp white oak (Quercus platanoides [bicolor]) in June. Monothalamous. Elongate oval, blister-like bodies protruding on both sides of the leaf, and without a nipple on the under side. Length about 1 mm.; width about .75 mm.

Habitat. Bronx Park, New York City.

The gall is somewhat similar to that of N. niger, but is smaller, and lacks the nipple on the under side. The flies emerge during June and early in July, from galls produced in May. The species is undoubtedly double brooded.