Cecidomyiidae

Macrodiplosis

Quercus georgiana

Alabama

Georgia

North Carolina

South Carolina

Quercus nigra

Arkansas

Delaware

Florida

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maryland

Mississippi

Missouri

Nebraska

New Jersey

New York

Ohio

Oklahoma

Pennsylvania

Tennessee

Texas

Virginia

West Virginia

Quercus phellos

Connecticut

Quercus velutina

Maine

Massachusetts

Michigan

Minnesota

New Hampshire

Rhode Island

Vermont

Wisconsin

Ontario

71st Report of the State Entomologist on injurious and other insects of the state of New York

Insect galls of Cedar Point and vicinity

Macrodiplosis qoruca

Cecidomyia q-oruca Walsh. 

An elongate fold gall close to the midrib on the under surface length 12 mm., diameter 1 mm. ; on Quercus tinctoria [velutina]. 

Gall midges of Aster, Carya, Quercus and Salix

Clinodiplosis florida [an inquiline]

Vein galls
Elongate, pocket-like swellings along midrib of round-leaved scrub oak [Quercus ilicifolia?]

Cecidomyia oruca

Vein galls
An elongate fold gall close to the midrib on the under surface, length 12 mm; diameter 1 mm, on Quercus tinctoria [velutina]

Hosts and galls of American gall midges

Fig. 20. Quercus velutina affected by the gall-gnat Cecidomyia oruca Walsh (?) in company with an undetermined mite. Felt, Journ. Ec. Ent. IV:467. 

Leaf-gall, evident as a fold snug alongside veins on under surface. Pouches isolated at times, but usually confluent and present in great numbers. Brownish opening on upper surface, resembling swollen lips of a knife-cut. In southern Ohio I have seen every leaf on a good-sized tree dying from this gall, as early as June. (The figure shows what are doubtless galls of Cecidomyia foliora Russ. & Hook., evident as infoldings of the edge.) 

Parallelodiplosis florida [an inquiline]

Elongate, pocketlike swellings along the midrib of round-leaved scrub oak, length 5 mm.

Cecidomyia oruca

Elongate fold gall close to the midrib on the under surface, length 12 mm, diameter 1 mm, on Quercus, possibly identical with the preceding.

Cecidomyia q-oruca Walsh [Gagne's World Catalog lists this citation as the original description of the species even though it was listed by Felt in 1910 and presumably described prior to that by Walsh]

An elongate fold gall close to the midrib, some 12 mm long, 1 mm wide, irregularly annulate and containing white larvae, occurs on Quercus tinctoria [velutina] and is labeled as this species in the Museum of Comparative Zoology, Cambridge MA.

Key to gall midges (A resumé of studies I-VII, Itonididae)

Macrodiplosis qoruca

Leaf fold, always with a slit-like opening
Leaf folded along or between veins
Regular, narrow, thick-walled, more or less annulate vein fold
Vein fold parallel sided, smooth, usually longer than 1 cm

Host: Quercus sp.

Distr: IL

The plant-feeding gall midges of North America

Quercus georgiana added tentatively as a host based on [this observation in Virginia in May](https://www.inaturalist.org/observations/82321201) [(2)](https://www.inaturalist.org/observations/83285540).

Quercus nigra added tentatively as a host based on [this observation](https://www.inaturalist.org/observations/155421020).

Gallformers ID Notes