84 THE REPORT OF THE No. 19 



Conical or sometimes almost spherical, red or purplish gall on the under 

 surface of the leaf along the veins. Hickory Cone Gall — Cecidomyia 

 sanguinolenta (O.S.) — Carya ovata. 



Smooth and rounded, with a fine elongated tip, 5 to 6 mm. in height and 

 2 to 3 mm. in greatest diameter. Pale green, turning brown in autumn on the 

 under surface of the leaves. Hickory Seed Gall — Cecidomyia carycecola 

 (O.S.) — Carya ovata. 



Sub-globular, pubescent, onion-shaped gall on the under side of the 

 leaves. The pubescence is pale when gall is young and rose-coloured when 

 mature. Hickor^ Onion Gall — Cecidomyia holotricha (O.S.) — Plate P., 

 fig. 6. Hicoria ovata. 



Narrow, cylindrical, tube-like gall, on the under side of the leaves. 

 Green when immature becoming brown or blackish when ripe. Hickory Tube 

 Gall — Cecidomyia tubicola — Carya alba. 



Pounded, brownish, downy gall on the under side of the leaves. Pesem- 

 bles somewhat a diminutive peach. About ^ to 1/5 of an inch in diameter. 

 Hickory Peach Gall — Cecidomyia persicoides — Carya ovata. 



Large, irregular knobs all over the husk of the nut containing thick- 

 walled cells. Hickory Nut Gall — Cecidomyia carycenucicola — Carva alba. 



Thin-walled galls about 3 mm. in diameter, hard and brittle, attached 

 to the under side of the leaves by a projection at the base which appears on 

 the upper side as a black dot surrounded bv a light yellow areola. Hickory 

 Ball Gall — Doplosis caryce — Plate F., fig.l. Carya ovata. 



B. — Galls on Stems. 



Large, globular or hickory-nut shaped galls on the stem, petiole or mid- 

 rib of the leaf. Variable in size. Hickory Aphid Gall — Phylloxera carycp- 

 caulis (Fitch) — Carya ovata. 



Affecting Horse-Balm. 



An inverted, pear-shaped gall much resembling the gall in the Wood 

 Nettle. The large end is weakly attached to a vein on the underside of the 

 leaf. Horse-balm Leaf Gall — Cecidom,yia collinsonice (Beutm) — Plate 0., 

 fig. 4. 



Affecting Huckleberry. 



Pounded or elongated galls 1-2 cm. in diameter on the stem of the 

 Huckleberry. Huckleberry Gall — Solenogopheria vacinii (Ashm) — Gaylus- 

 sacia resinosa. 



Affecting Genus Juglans. 



The Walnut and Butternut. 



A brown, velvetv erineum surrounding the leaf stalks, or on the main 

 veins, causing a swelling or bending of the stalk or vein. "Walnut Cushion 

 Gall — Eriophyes sp. — Plate D., fig. 2. Juglans nigra and probably J. 

 cinerea. 



A green pocket-gall on the upper side (usually) of the leaf. Walnut 

 "Wart" Gall — Eriophyes sp. — Juglans nigra and probably J. cinerea. 



Affecting Juneberry. 



Small nearly globular, dark brown, pocket galls, averaging 2 mm. in 

 diameter, singly or in clusters on the upper side of the leaf. Juneberry Ball 

 Gall — Eriophyes sp. — Plate D., fig. 1. Amelanchier rotundifolia. 



