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:47o. 



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. 



Phytoptus 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- 

 tennined. 



"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. 7)0. 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 vStebbins. 



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-S mm. Very rare. 



Fig. 57. Acer saccharum affected by the mite Eriophyes 



crumena Riley. 



Acarus aceris-criimena Riley, Am. Ent. 11:339. 



Phytoptus acericola Garman. 



Eriophves 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. 



