386 
The Ohio Naturalist. 
[Vol. XV, No. 2, 
Fig. 46. Rhus toxicodendron affected by the mite Eriophyes 
rhois Stebbins. 
Pliyloptus sp. Garman, 12th Rep. St. Ent. Ills. 138. 
Eriophyes sp. Cook. 
Stebbins, Bull. 2, Springfield Mus. 41. 
Leaf gall on either surface made up of tiny bulges and occa¬ 
sional pouches, giving the leaf a granular appearance. The 
open side of the gall shows considerable down—or trichome- 
production. Very abundant. 
Fig. 47. Rhus aromatica affected by a mite, Eriophyes sp. 
Leaf gall, differing from preceding in always consisting of one 
pouch, or several fused, on upper surface of leaf. Usually red- 
tipped or entirely red, and about 1 x 3 mm. A form hitherto 
unreported, I believe. 
Fig. 48. Impatiens biflora affected by the gall-gnat Lasioptera 
impatientifolia Felt. 
Cecidomyia impatientis O. S. in part. 
Felt, 22nd Rep. Ins. N. Y. 105. 
Stebbins, Bull. 2, Springfield Mus. 43. 
Leaf-gall, frequently involving stems or buds, sub-spherical, 
several chambered. 4-12 mm. diameter. Greenish translucent, 
becoming tinged with pink. Common. 
Fig. 49. Vitis vulpina affected by the louse Phylloxera 
vastatrix (Fitch) Planchon. 
Phylloxera vitifoliae Fitch, 1st Rep. Ins. N. Y. 158. 
Pemphigus vitifoliae Fitch. 
Brysocrypta vitifoliae Walsh. 
Stebbins, Bull. 2, Springfield Mus. 44. 
Leaf gall, present in great numbers on under side, and being 
very rough and irregularly spherical, usually bristle-tipped. 
Leaf-green, single-chambered and often showing inquiline arach¬ 
nids and cecidomyid larvae. 2-5 mm. diameter. This is the 
louse so destructive to grapes in France, by virtue of its root- 
infesting proclivities. Frequent. 
Fig. 50. Vitis vulpina affected by the gall-gnat Schizomyia 
coryloides Walsh & Riley. 
Cecidomyia vitis-coryloides Walsh and Riley, Am. Ent. 1:106. 
Stebbins, Bull. 2, Springfield Mus. 44. 
Bud gall, being a spherical mass 15-50 mm. diameter, of 
small, lozenge-shaped galls, each about 5 x 15 mm. Leaf-green, 
covered with a felty yellow or orange pubescence. Infrequent. 
Fig. 51. Vitis vulpina affected by the gall-gnat Cecidomyia 
viticola. 
Cecidomyia viticola Osten Sacken, Mon. X. Am. Dipt. pt. 1:202. 
Beutenmiiller, Bull. Am. Mus. IV, pt. 1:272. 
