386 The Ohio Naturalist. [Vol. XV, No. 2, 



Fig. 46. Rhus toxicodendron affected by the mite Eriophyes 

 rhois Stebbins. 



Phytoptus 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. 



Cecidomvia im patientis 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. 

 Brvsocrvpta vitifoliae Walsh. 

 Stebbins, Bull. "2, Springfield Mus. 44. 



Leaf gall, present in great numbers on under side, and being 

 very rough and irregularly spherical, usualh' bristle-tipped. 

 Leaf-green, single-chambered and often showing inquilinc 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. .If). Vitis vulpina affected by the gall-gnat Schizomyia 



coryloides Walsh & Riley. 



Cecidomyia vitis-coryloides Walsh and Rilcv, Am. linl. 1:10(). 

 Stebbins, Bull. 2, Springfield Mus. 44. 



Bud gall, being a spherical mass l.l-5() mm. diameter, of 

 small, lozcngc-shapcd galls, each about 5 x 15 mm. Lcaf-grccn, 

 covered with a felty yellow or orange pubescence. Infrequent. 



Fig. 5L Vitis vulpina affected by the gall-gnat Cecidomyia 

 viticola. 



Cecidomvia viticola Osten Sacken, Mon. N. Am. Dipl. p(. 1:202. 

 Beutenniuller, Bull. Am. Mus. IV, pt. 1:272. 



