82 THE REPORT OF THE No. 19 



upper surface paler than tlie leaf, below, with a white nipple surrounded by 

 a furrow. Eriophyes sp. — Yitis cordifolia. 



Small, rough galls usually on the upper surface of the leaf. The galls 

 are very numerous, and frequently the leaves are absolutely covered with 

 them. Grape phylloxera- — PliyUoxera vastatrix (Planchon) — Vitis sp. 



Elongated, conical, red galls, .7-1 cm. in length usually on the upper 

 side of the leaves. Grape Yine Tube Gall — Cecidomyia viticola (O.S.) — 

 Plate 0., fig. 1. Yitis sp. 



Irregular, soft and succulent swellings on stems and leaf-stalks of 

 Grapes ; yellow ffreen or red in color. Grape-vine Tomato Gall — Lasioptera 

 vitis (O.S.) — Yitis sp. 



Oval, red swellings of the petiole. About i inch long and I of an inch 

 in diameter. Grape Petiole Gall — Yitis cordifolia. 



B. — Galls on Steins. 



Pounded galls flattened at the base and jointed at the top. On the stems 

 of Wild Grapes. Grape-vine Apple Gall — Cecidomyia vitis-pomum (Walsh 

 & Eiley). 



Affecting Hackberry. 



A witch -broom gall on branches and twigs. Hackberry Witch-broom 

 Gall — Eriophyes sp. — Celtis occidentalis. 



A woody gall with bluntly-rounded apex and slightly constricted at the 

 point of attachment to the leaf. Opposite the gall is a concave depression. 

 Hackberry Nipple Gall- — Pachypsylla celtidis-maTnmoi (Riley) — Celtis occi- 

 dentalis. 



Circular spot-like gall on the under side of the leaf with a small nipple 

 in the middle. Hackberry Blister Gall — Pachypsylla celtidis-vesiculum 

 (Riley) — Celtis occidentalis. 



Affecting Hawthorn. 



A fold of the leaf making long, irregular, wavy projections on the upper 

 surface of the leaf. From the midrib to the edge of the leaf is the general 

 direction of the gall. Serpentine Gall — A cams cratcrgi vermiculus — Plate 

 G., fig. 3. Crataegus sp. 



Small, round swellings (capsules) protruding very slightly on both sides 

 of the leaf. About .5-1 mm. in diameter. Galls very numerous where they 

 occur — sometimes more than 100 on a single leaf. Speck Gall — Eriophyes 

 sp. — Crataegus sp. 



These tiny oval galls can be easily recognized from their peculiar habit 

 of arranging themselves all around the margins of the leaf, thus forming a 

 sort of border for it. They are often so numerous that there is one for each 

 serration. Each gall is about 2 mm. long, 1 mm. wide, and about 5 mm. 

 thick. It extends about equally beyond both surfaces of the leaf and is of 

 much the same texture as the leaf itself, except that towards the apex both 

 it and the apex of the serration on which it is situated tend to become brown. 

 In this brown part there is a small aperture. The gall is monothalamous, 

 and contains a vsingle, yellowish white, short, fat larva, which on July 31st 

 had not -^et begun to pupate. Hawthorn Leaf-border Gall — Plate N., fig. 7. 

 Crataegus sp. 



Small red, pod-shaped structures slightly tapering towards one end on 

 the upper surface of the leaf. From 5-8 mm. long and about 2 mm. wide. 

 Pod Gall — Ceeidomyidce — Crataegus sp. 



(Ja EN. 



