Cecidomyiidae

Acericecis

Acer circinatum

Alaska

California

Oregon

Washington

British Columbia

Acer pensylvanicum

Connecticut

Georgia

Kentucky

Maine

Maryland

Massachusetts

Michigan

Minnesota

New Hampshire

New Jersey

New York

North Carolina

Ohio

Pennsylvania

Rhode Island

South Carolina

Tennessee

Vermont

Virginia

West Virginia

Wisconsin

Acer rubrum

Alabama

Arkansas

Delaware

Florida

Illinois

Indiana

Iowa

Louisiana

Mississippi

Missouri

Oklahoma

Texas

New Brunswick

Newfoundland and Labrador

Nova Scotia

Ontario

Prince Edward Island

Quebec

Acer saccharinum

Kansas

Nebraska

New Mexico

North Dakota

South Dakota

Manitoba

Saskatchewan

Acer saccharum

Arizona

Colorado

Idaho

Montana

Nevada

Utah

Wyoming

Acer spicatum

Saint Pierre and Miquelon

Acer x freemanii

An illustrated catalogue of American insect galls

Insect enemies of Eastern Forests

Acericecis ocellaris

Sciara ocellaris

Acer rubrum

On upper side of leaf; small, conical pustules of pale yellowish, green bordered with an orange scarlet circle outwardly deepening to maroon.

MA, May

Cecidomyia ocellaris

Acer rubrum

Ocellate, yellow, red-margined blister leaf gall, diameter 3 to 4 mm.

Key to American Insect Galls

Itonida ocellaris

Acer rubrum

The ocellate maple leaf gall (fig. 130) is believed to be caused by Itonida ocellaris (O. S.), although there is no positive record of its rearing. The gall or spot, which measures about 3 to 4 mm. in diameter, is yellow and has a red center and margin. The larva of I. ocellaris is nearly transparent and lives in an exposed position on the leaf. When full grown, about the latter part of September, the larva drops to the ground, where it spins a crude cocoon in which it pupates. The species is widely distributed but rarely, if ever, injurious. 

Acericecis ocellaris

Hosts: Chiefly Acer rubrum; also A pensylvanicum, saccharinum, saccharum, spicatum; typical spots occur on A circinatum from OR and WA but larvae of the gall midge have not been reported.

Circular, usually red, leaf spot, each with one exposed larva on under side of leaf

Spots are about 5 mm in diameter, usually red, but sometimes green or yellow, and evident in spring as soon as leaves are fully expanded.

Range: eastern (and possibly throughout) North America

The plant-feeding gall midges of North America

This gall midge produces a reddish, leaf blister on the leaves of *Acer rubrum*. Galls are common in Allegheny County.

The Gall Midges (Diptera: Cecidomyiidae: Cecidomyiinae) From Allegheny County Pennsylvania