. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 279.—Eriopliyes gossypii: Ante- rior part of body. (Author's illas- tration.) Fig. 280.—Dimple gall. (Original.) Therefore he believed these mites to be adults and named them Phytoptus. A tew years later Scheuten examined the pear-leaf blister, found the mites, and decided that they were immature forms and that the full- grown creature was an eight-legged mite that he found associated with them. This supposed adult he figured, and it proves to be a parasitid, which was doubtless feeding on the Erio
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 279.—Eriopliyes gossypii: Ante- rior part of body. (Author's illas- tration.) Fig. 280.—Dimple gall. (Original.) Therefore he believed these mites to be adults and named them Phytoptus. A tew years later Scheuten examined the pear-leaf blister, found the mites, and decided that they were immature forms and that the full- grown creature was an eight-legged mite that he found associated with them. This supposed adult he figured, and it proves to be a parasitid, which was doubtless feeding on the Eriophyes. Since then many observers have examined these mites and confirmed Dujardin's conclusion that they are adult and consti- tute a separate group of acari. The deformations produced by mites on plants have been called "; Nearly all such defor- mations are produced by members of this family. The relation of the mite to the gall or erineum is not fully known. An erineum is practically a dense mass of deformed hairs. These hairs are usually thickened and twisted and the whole mass is of an even height. The mites live among these deformed hairs, sucking the juices of the leaf. As the juice becomes exhausted the erineum becomes reddish or rusty brown in color and is a very prominent object. At this stage, when the erineimi is most easily noticed, one is apt to find few if any mites as they have left for fresh pastures. The galls may be on either surface of the leaf, though commonly above. The form is quite characteristic of the species, though there is usually some variation. These galls always have an opening tlirough which the mites can pass. This character will distinguish these galls from those of Diptera and Hymenoptera, but not from homopterous galls. The opening is often very small and concealed by tufts of hairs. Within the gall is often partly filled up with folds and projec- tions and sometimes with hairs. In color the gall is at first like t
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