1908 ENTOMOLOGICAL SOCIETY. 91 



Affecting Viburnum. 



A small, blister-like gall, circular in outline, 3-4 mm. in diameter. 

 Viburnum Leaf Blister Gall. Viburnum acerifolium. 



Affecting Virginia Creeper. 



Green and succulent fold gall on the midrib of the leaf. Midrib Gall on 

 Virginia Creeper — Cecidomyia sp.— Plate E., fig. 7. Ampelopsis quinque- 

 folia. 



Affecting White Lettuce. 



Large, rough, irregular swellings on stem. White Lettuce Stem Gall— 

 Aulax nabali (Brodie) — Plate P., fig. 5. Prenanthes alba. 



Affecting Willows. 

 A. — Galls on leaves. 



Smooth, fleshy, sessile, globular or slightly oval, monothalamous gall, 

 like a miniature apple. About 1 cm. in diameter growing on one side of the 

 midrib of the leaf. Willow Apple Gall — Pontania pomum — Salix sp. 



Smooth, flatfish, glossy enlargements of the- petiole or often of the mid- 

 rib of the leaf near the base. Willow Petiole Gall — Pontania desmodeoides. 

 Salix lucida. 



Irregularly elongate-oval fleshy galls projecting equally on both sur- 

 faces of the leaf. Usually many on a leaf. Willow Flat Gall — Pontania 

 hyalinoA — Salix sp. 



Cluster of massed leaves surrounding a small cell containing a yellowish 

 larva. Similar in appearance to the Goldenrod Bunch Gall. Willow Bunch 

 Gall — Rhabdophaga hrassicoides — Salix sp. 



A pale green or purple capsule gall, projecting either above or below 

 the leaf, or both; 1| to 2 mm. in diameter. Eriophyes sp. Salix cordata. 



Small, irregular, serrate and roughened pocket-galls or semi-capsules, 

 green or red, strongly pilose above and thickly pubescent beneath. Usually 

 on the upper side of the leaf. Eriophyes sp.- — Plate K., fig. 4. Salix dis- 

 color. 



Small, crimson pocket-galls or semicapsules on the upper side of the 

 leaf. 1^ to 2| mm. in diameter. Eriophyes sp. Salix amygdaloides. 



A small capsule gall, irregularly hemispherical, greenish yellow, with 

 a projecting aperture usually on the lower surface of the leaf, 1 to 2 J mm. 

 in diameter. Eriophyes sp. Salix nigra. 



Small irregular, serrate capsule-gall, green or red, usually on the upper 

 side of the leaf; beneath sometimes impressed, more often projecting. 1 to 

 2 mm. in diameter. Eriophyes sp. Salix bebbiana. 



Small irregular, serrate capsule-gall, projecting on both sides of the 

 leaf, 1 to 2 mm. in diameter. Eriophyes sp. Salix petiolaris. 



A bud deformation of the flower catkins and leaf buds or parts of leaves, 

 producing a large, irregular, crumpled mass. Eriophyes sp. — Plate D., fig. 

 5. Salix nigra. 



Rosette-like structures on the leaves and stems. Unsightly Willow 

 Gall — Eriophyes sp. Salix sp. 



This gall has two different forms in the course of its development. 

 There is first the "bead" stage, when each gall looks like a small yellowish- 

 white bead about 1.5 mm. in diameter, two-thirds of the bead appearing 

 on the under and nearly one-third on the upper surface of the leaf. The 

 tip of the bead, on the lower side of the leaf, is perforated. The texture 

 is hard and close and the surface even and somewhat pubescent. The sec- 



