1908 ENTOMOLOGICAL SOCIETY. 85 



I 



Affecting Locust. 



Oval swellings on the branches and twigs, generally occurring at the 

 junction of the leaf petiole with the branch. Locust Twig Borer — Ecdy- 

 tolopha insiticiana — Gleditschia triacanthos. 



Affecting Maple. 



A whitish frost-like erineum with scattered spots of rosy pink, on the 

 upper surface of the leaf, sometimes nearly covering it. Eriophyes sp. — 

 Plate H., fig. 1. Acer rubrum. 



A pale yellow or white erineum on the under side of the leaf. Trichomes 

 capitate. Eriophyes sp. — Acer saccharinum. 



A nearly spherical pocket gall on the upper surface of the leaf, varying 

 from light green through red or purple to black. Phloecoptes quadripes — 

 Plate J.J fig. 1. Acer saccharinum. 



A white or whitish erineum in patches on the under side of the leaf, 

 often limited by the veins. Trichomes capitate. When old the trichomes 

 assume a brown color. Eriophyes sp. — Acer saccharum. 



A green, reddish or purplish, slender, pouch-gall projecting from the 

 upper surface of the leaf. Phloecoptes aceris — Plate M., fig. 6. Acer 

 saccharum. 



A white or whitish erineum in patches on the under side of the leaf. 

 Eriophyes sp. — Acer nigrum. 



Irregular wart-like swellings (Dimple) on the upper surface of the leaf. 

 The swellings are green at first and turn gray when mature. The average 

 diameter is about 3 mm. Manitoba Maple Wart Gall — Eriophyes sp. — Plate 

 G., fig. 4. Acer negundo. 



A white, whitish, or pale yellow erineum on the under side of the leaf, 

 in patches often in the axils of the veins. Trichomes long, tangled and dis- 

 torted. — Eriophyes sp. — Plate H., fig. 2, Acer spicatum. 



Target-like, circular, flat galls on the leaves of Red Maple, Eye-spot 

 Gall of Maple — Cecidomyia ocellata, O.S. — Plate F. fig. 6. Acer sp. 



Swellings on the midrib of the leaflets much resembling the Ash Midrib 

 Gall, Manitoba Maple Midrib Gall — Cecidomyiai rvegundinis (Gillette.) Acer 

 negundo. 



Irregularly elliptical swellings along the veins of the leaves of Hard 

 Maple, red, green or yellow in colour. Hard Maple Leaf-vein Gall — 

 Cecidomyid sp. — Plate P. fig. 1. Acer saccharum. 



Affecting Muhlenbergia. 



Bud galls with very much enlarged glumes. Muhlenbergia Bud Gall — 

 Lasioptera muhlenbergise (Naster) Muhlenbergia glomerata. 



Affecting Nem^ Jersey Tea. 



A terminal, spindle-shaped enlargement of the stem, 10-15 mm. long. 

 New Jersey Tea Stem Gall — StagTuatophora ceanothiella (Cosens) — Cean- 

 othus americanus. 



Affecting Oak. 



An irregular dimple upon the blade of the leaf. From beneath it 

 appears as an irregular concavity, lined with a tangled mass of white vege- 

 table hairs. Oak Dimple Gall — Euriophyes querci — Plate L. fig. 3. Quer- 

 cus macrocarpa. 



