Dec., 1914.] 
Insect Galls of Cedar Point. 
387 
Leaf gall on lower surface, straight, conical, narrowly tapering. 
Light yellow-green, red or black tipped. 3-10 x 2 mm. 
Uncommon. 
Fig. 52. Vitis vulpina affected by the gall-gnat Schizomyia 
petiolicola Felt. 
Felt, Journ. Ec. Ent. IV:475. 
Petiole gall, more or less elongated or spindle-shaped, and 
mainly on outer (lower) side of petiole. Color normal. 5-10 x 
15-30 mm. Not common. 
Fig. 53. Tilia americana affected by the mite Eriophyes 
abnormis Garman. 
Phytoplus abnormis Garman, 12th Rep. Ills. St. Ent. 
Cook, Ins. Galls Ind. 860. 
Leaf gall, being a small pouch with constricted neck and 
fissured tip, usually on upper surface of leaf. Fairly common. 
Fig. 54. Tilia americana affected by a gall-gnat (?), unde¬ 
termined. 
“Undetermined”—Wells, Oh. Nat. XIV, No. 6:294. 
Bulbous enlargement of the petiole, more or less elongated, 
usually eccentric and near the base. Normal color, 5-8 mm. 
long, 2-3 mm. diameter. Seldom found. 
Fig. 55. Tilia americana affected by the gall-gnat Cecidomyia 
verrucicola Osten Sacken, Can. Ent. VII:200. 
Cook, Ins. Galls Ind. 838. 
Leaf-gall, flattened, spherical, projecting about equally from 
both surfaces of leaf. Green and red, becoming brown when 
mature, and providing for emergence of insect by means of a 
hinged lid, which is usually below. Common. 
Fig. 56. Cornus stolonifera affected by the gall-gnat Ceci¬ 
domyia (?) tuba Stebbins. 
Stebbins, Bull. 2, Springfield Mus. 46. 
Leaf gall on underside, tubular, with swollen base and cleft 
tip, not unlike a kettle-spout. Bright red and finely pubescent 
like underside of leaf. 1-2 x 5-8 mm. Very rare. 
Fig. 57. Acer saccharum affected by the mite Eriophyes 
crumena Riley. 
Acarus aceris-crumena Riley, Am. Ent. 11:339. 
Phyloptus acericola Garman. 
Eriophyes acericola Cook. 
Stebbins, Bull. 2, Springfield Mus. 42. 
Leaf gall, being a very slender, spindle-formed pouch on the 
upper surface. Green, rapidly discoloring. Abundant in a 
restricted area. .5 x 4-6 mm. Green Island. July. 
