Eriophyidae 1077 



information as to the mites which cause the various gall formations. There 

 are also a number of free-living forms, which apparently do not make 

 galls but are associated with the gall-forming individuals. 



Chadwick's list (1908) is a very important contribution to the knowl- 

 edge of the mite galls, but it is probable that many of these structures were 

 described originally from material collected at different periods of develop- 

 ment and are the work of the same species of mite. 



Some species, as the mites attacking apple, pear, maple, elm, linden, 

 beech, willow, and the wild and cultivated stone fruits, are found wherever 

 these plants are growing. In most instances serious damage is caused by 

 the deforming of the leaves, or by the dropping of leaves and deforming 

 of fruits. 



The apple and pear mites are a menace in orchards of these fruits. 

 Eriophyes phloeocoptes is of only local importance, but wherever it occurs 

 it deforms the fruit spurs. Phyllocoptes cornutus is responsible for "silver 

 leaf" on peach, plum, and apricot. The species was very abundant during 

 one season at Geneva, but no serious harm to trees or fruit was noted. 



SUBFAMILY ERIOPHYINAE 



Eriophyes Siebold 



E. abnormis Garm. Geneva. On Tilia americana. 



E. avellanae Nal. Nassau; Albany. On Corylus americana. 



E. brevitarsus Fock. "NY" (?), reference in Chadwick (N. Y. State Mus., Bui. 12, 



p. 124, 1907). On Alnus glutinosa. 

 E. caulus Cook. Irving. On Juglans nigra. 

 E. confusus Hodg. Geneva. On Acer saccharinum. 

 E. elongatus Hodg. Geneva. On Acer saccharmn. 



E. fraxiniflora Felt. Albany; LI: Brooklyn. On Fraxiniis americana. 

 E. fraxini Garm. Geneva ; Poughkeepsie ; NYC. On Fraxinns americana. 

 E. malifoliae Parr. Geneva. On Pyrus malus. 

 E. maculatus Hodg. Geneva. On Acer saccharum. 

 E. marginatus Conn. Albany. On Salix alba. 

 E. major Hodg. Geneva. On Acer rubrum. 



E. modestus Hodg. Bug L., Adirondacks. On Acer saccharum. 

 E. negundi Hodg. Geneva. On Acer negnndo. 

 E. ornatus Hodg. Geneva. On Acer rubrum. 



E. padi var. Nal. Blackhead Mt., Catskills ; Poughkeepsie. On Prunus serotina. 

 E. parallelus Hodg. Seventh L., Adirondacks. On Acer spicatum. 

 E. phloeocoptes Nal. Hudson Val. On Prunus domestica. 

 E. populi Nal. Lebanon Sps. On Popnlus tremuloides. 

 E. pruni Schoene. Geneva. On Primus americana. 

 E. pruni-crumena Walsh. Geneva. On Prunus americana. 



