. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACAEINA OR MITES. 139. Fig. 200.—Phyllocoptes sp., side view, illustration.) (Author's latter has been sufficiently abundant in California to be considered injurious to the trees. A ?mall roundi.'^h gall, with many folds in its interior and the orifice guarded by long white hairs, is also found on the leaves of black walnut. The mites are red, and were described by Nalepa as Eriophyes tristriatus. On willows there are small rounded galls on the leaves formed by E. semen Walsh, and longitudinal leaf
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACAEINA OR MITES. 139. Fig. 200.—Phyllocoptes sp., side view, illustration.) (Author's latter has been sufficiently abundant in California to be considered injurious to the trees. A ?mall roundi.'^h gall, with many folds in its interior and the orifice guarded by long white hairs, is also found on the leaves of black walnut. The mites are red, and were described by Nalepa as Eriophyes tristriatus. On willows there are small rounded galls on the leaves formed by E. semen Walsh, and longitudinal leaf folds caused by E. salicicola Garman. Inrolled loaf margins are caused by an unde- termined species, and large, irregu- lar deformations of the buds are the results of E. aenigma "Walsh. Oak leaves often show an erineum on the underside, wliich sometimes becomes a dimple gall; on the white oak it is produced by E. querci Gar- man , wliile that on other oaks is prob- ably the work of a different species. The leaves of basswood frequently have large pouch galls, which are in- habited byE. ahnormis Garman. On the leaves of the American elm small round galls are caused by E. ulmi Garman. On the alder leaves there are often great numbers of small rounded galls produced by E. brevipes Fockeu. Pouch galls on leaves of wild cherry are made by E. serotinae Beutenmiiller, while minute rounded galls on the leaves of the tupelo or sour gum are caused by E. nyssae Trotter. On the twigs and stems of poplar there are some- times very large, irregular deformations, known to the Germans as "knospenwuch- ; This gall is produced by E. populi Nalepa and occurs throughout the Northern States from New England to Colorado, where it is rather common. Eriophyes gossypii Banks (fig. 279) occurs injuriously upon cotton in Montserrat and some other West India islands. The mites produce galls which were so numerous as to cover many leaves with a mass of irregular, roughened swellin
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