1908 ENTOMOLOGICAL SOCIETY. 88 



Tiny, oval structures arranged around the margin of tlie leaf. Often so 

 numerous that there is one for each serration. Leaf -border-Gall Cecidomyta 

 Crataegus sp. 



Green or pink, globular, bladder-like structures on the under surface of 

 the leaf. About 5 mm. in diameter. Bladder Gall — Cecidomyidcc — Plate 0., 

 fig. 5. Crataegus sp. 



Very small, monothalamous, conical structures, 1 to 2 mm. high and 

 1,1.5 mm. wide at the base; formed anywhere on either surface of the leaf and 

 sometimes on the stem of young twigs. Cone Gall — Eriophyes — Crataegus sp. 



Cylindrical structures, hollow, red or green in color, about 3 mm. in 

 height and diameter and with a hole in the top. Top of gall thickly set with 

 spines. Burr Gall — Cecidomyia bedeguar, O.S. — Plate 0., fig. 3. Crataegus 

 sp. 



Cock's comb-like structure on the upper surface of the leaf. Cock's 

 Comb Hawthorn Gall — Hormomyia cratcegifolia (Felt) — Plate A., fig. 4, 

 Crataegus sp. 



Leaf slightly thickened, purplish in color and rolled in upon itself, the 

 under surface being the one enclosed. Wooly Aphid Gall (Schizoneura) — 

 Crat"aegus sp. 



Affecting Helianthtjs. 



Globular gall about h an inch in diameter on the leaves. Helianthus 

 Ball Gall — Cecidomyia bulla (Walsh) — Helianthus divaricatus and H. 

 Strimosus. 



Linear-shaped galls in clusters on the stem. Cecidomyia helianthi 

 (Brodie) — Helianthus divaricatus and H. strimosus. 



Affecting Hazel. 



This gall is found only along the main veins of the leaf. The part of the 

 leaf round the affected portion of the vein become crimped, the crimps all 

 radiating towards the vein as a common centre. Hazel Leaf Crimp Gall 

 (Undescribed) — Corylus americana. 



A bud deformation, which attacks bud as soon as it expands, and checks 

 its subsequent development. Hazelnut Bud Gall — Eriophyes avellana; — 

 Corylus americana. 



Affecting Hickory 

 A. — Galls on leaves. 



Flattened, circular, yellow or whitish galls, an inch in diameter. Hick- 

 ory Button Gall — Phylloxera fovela — Plate N., fig.l. Carya glabra. 



Red, elongated galls, consisting of a fold of the main veins running 

 from the midrib to the edge of the leaf. Hickory Vein Gall — Phylloxera 

 carycevencc — Carya Glabra. 



Cone-shaped gall about 3 mm. in diameter, on the upper side of the leaf. 

 Green in color; the opening on the lower surface is fringed with hairs. 

 Hickory Cone Aphid-Gall — Phylloxera carymfallax — Plate I., fig. 4. Carya 

 ovata. 



Hemispherical gall on the upper surface of the leaf, opening on the 

 under surface by means of a narrow slit, | to \ of an inch in diameter. Hick- 

 ory Hemispherical Gall Phylloxera caryae-globuli — Dactylosyhcera hemis- 

 pcericum — Carya alba. 



Expansion of thje young fruit or ovary to two or three times the size of 

 the normal fruit. The centre of the gall is filled with Aphids. Fruit Gall-- 

 Phylloxera (undescribed) — Carya ovata. 



