Callirhytis marginata, new species

Host.—Quercus coccinea Muenchhausen.

Gall.— Abrupt cushion-like swelling in the bark just at or below the surface of the ground on young sprouts which are 5-10 mm. in diameter. Single or confluent so that they may contain one to a half a dozen cells which are 4-5 mm. in diameter. They are similar to those of Callirhytis rubida Weld.

Type locality. — Fort Sheridan, Illinois. One cluster of these galls was found April 25, 1915, and one fly emerged in collecting box and two were cut out of galls. Three more of same species were found ovipositing in the side of the swelling buds in the same clump of sprouts at whose base the galls were found.

Callirhytis marginata

Quercus coccinea
"Root" galls
Abrupt cushion-like swellings in bark at or below surface on sprouts which are 5-10 mm in dia, in the fall.

Quercus rubra
"Root" galls
Abrupt cushion-like swellings in bark at crown on sprouts, covered with normal bark. Adults emerged April 25 and were observed ovipositing in the swelling buds.

[Photo caption (no photo)]
On Q coccinea, rubra, similar to Fig 40 above [Callirhytis rubida]. Adults emerged Apr 25 (IL). Others were seen ovipositing in swelling buds on the same clump of scarlet oak sprouts. Further study may prove marginata to be synonym of rubida which has page precedence.