. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 90.—Coxal plates of Fig. 91.—Palpus of Spcrchoyi. Sperchon. (Original.) (Original.) destitute of true s-svimming hairs, the palpi have no tooth below, and the epimera form three plates. There are three sucking disks each side of the genital orifice. Four species are known from small rivers in Canada. Atax (figs. 95,96, 97,98) is one of the largest genera, and Dr. Wolcott has worked out some 12 species, and another has since been added from Texas. The genital opening is situate at the tip of body, a
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 90.—Coxal plates of Fig. 91.—Palpus of Spcrchoyi. Sperchon. (Original.) (Original.) destitute of true s-svimming hairs, the palpi have no tooth below, and the epimera form three plates. There are three sucking disks each side of the genital orifice. Four species are known from small rivers in Canada. Atax (figs. 95,96, 97,98) is one of the largest genera, and Dr. Wolcott has worked out some 12 species, and another has since been added from Texas. The genital opening is situate at the tip of body, and the sucking each side are 10 or more in number. The legs have swimming hairs, and the first pair is thicker than usual. The palpi (fig. 98) are enlarged at base, and the fourth joint bears three papilUie or spurs below. Most of the species occur, for at least a time, in certain fresh-water mussels, particularly of the genera Unio and Anodontn. They are found in the mantle folds or gills of the mussel, and feed on th(^ minute animals drawn in by the mussel. The genus Ncumauia is closely allied to Atxix, l)ut peculiar ringed bristles on legs I and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Banks, Nathan, b. 1868; United States. Department of Agriculture. Washington, D. C. : G. P. O.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1915
