78 THE REPORT OF THE No. 19 



A yellowisli-wliite to brownish erineum forming large patches between 

 the ribs on the under side of the leaf. Eriophyes sp. — Betula papyrifera. 



A transparently white, granular erineum on the surface of the leaves — 

 Eriophyes sp. — Betula pumila. 



A capsule gall, very small, yellow to brown. Paper Birch Capsule Gall — 

 Eriophyes sp. — Plate M., fig. 5. Betula papyrifera. 



A nodular pocket gall, occuring upon both faces of the leaf ; yellowish 

 or reddish to purplish. Paper Birch Pocket Gall — Eriophyes sp. — Plate K., 

 fig. 1. Betula papyrifera. 



Affecting Blue Flag. 



An oval enlargement on the inside of the leaf, usually about 1 inch 

 from the tip. Iris Leaf Gall — Agromyza magnicornis (Lowe) — Iris versi- 

 color. 



Affecting Bone set. 



Oval swellings on the stems and leaf stalks. Boneset Stem Gall-- 

 Choristoneura perfoliatum (Pelt) — Plate A., fig. 5. Eupatorium perfoliatum. 



Affecting Bramble. 



A. — Galls on leaves. 



Irregular-shaped, woody swellings at the base of the leaflets, or on the 

 midrib of the Blackberry. Wood Leaf Gall — Lasioptera farinosa (Wm. 

 Beutm) — Pubus villosus. 



Irregular sub-conical stem galls about three-quarters of an inch in 

 length. Blackberry Stem Gall — Lasioptera nodulosa (Beutm) — Rubus vil- 

 losus. 



B. — Galls on stem. 



A mass of hard, small cells covered with a dense thick mass of green fila- 

 ments clustered around a branch or twig of Blackberry, From 1.5 to 2 cm. 

 in diameter. Mossy Rose Gall — Rhodites rosse (Linn) — Plate B., fig. 1. 

 Rubus villosus. • 



Large, oblong, polythalamous stem gall, 1 to 3 inches in length. Sur- 

 face uneven with deep longitudinal furrows which divide the gall, more or 

 less completely, into 4 or 5 portions. Pithy Blackberry Gall — Diastrophus 

 nehulosus, O.S. — Rubus villosus. 



Symmetrical swelliners of the Blackberry cane. Gouty Gall Agrilus rufi- 

 collis (Fab.) — Rubus villosus. 



Hard woody, somewhat globular, seed-like bodies 2 to 4 mm. in diameter 

 formed in clusters on the stem. More or less covered with curved spines 

 which are about 2 mm. long. Blackberry Seed Gall — Diastrophus cuscutoe- 

 formis (O.S.) — Rubus villosus. 



Large, reddish-brown, polythalamous, tubercular or irregular gall about 

 1 to 1.75 inches long and .5 inches in diameter, arising abruptly on the stem. 

 Green in summer, darkening towards winter. Raspberry Stem Gall — 

 Diastrophus turgidus (Bass) — Plate B., fig. 2. Rubus strigosus. 



Affecting Bugleweed. 



An elliptical or sometimes almost spherical gall formed on the stem. 

 Bugleweed Stem Gall — Lasioptera lycopi (Felt) — Plate N., fig. 5. Lycopus 

 virginicus. 



