Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . at quadrangular, and has nolateral expansions, while the legs are stout, with tripartiteclaws. We have observed an undescribed species of this genussucking the eggs of the canker-worm in Salem. It may becalled Nothrus ovivorus (Fig. 639). It is reddish brown, witha dense hard body, with the edge of the abdomen expanded \\i evenly, and with threeslender capitate processeson the cephalothorax. AcARiD^. This familycomprises the true mites,which have
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . at quadrangular, and has nolateral expansions, while the legs are stout, with tripartiteclaws. We have observed an undescribed species of this genussucking the eggs of the canker-worm in Salem. It may becalled Nothrus ovivorus (Fig. 639). It is reddish brown, witha dense hard body, with the edge of the abdomen expanded \\i evenly, and with threeslender capitate processeson the cephalothorax. AcARiD^. This familycomprises the true mites,which have soft, thin-skinned bodies, witheither scissor or st^de-likemjfndibles, the latter form-ing a retractile hornytube. The maxillae areobsolete, as well as theocelli. The claws aresometimes provided witha sucker. The members of this, and the following groups,are among the most lowly organized of articulates, and arefound living parasitically on the skin of other animals, orburied within their integuments, while certain acari havebeen detected within the lungs and air passages, the bloodves-sels and the intestinal canals of vertebrate animals. The. Fig. 640. ACARID^. , 665 genus Cheyletus is remarkable for having the maxillae very large,and like a pair of legs, with the ends tripartite, the outerdivision being curved and clawlike, while the two innermostare slender lobes pectinated on the inner side ; the mandiblesare style-like. A European species (Fig. G40) feeds on Cheese-mites. It is thought by Mr. R. Beck that another species ofCheyletus is parthenogenous, as he obtained several genera-tions from the first individual, without the intervention of amale. (Science-Gossip, 1869, p. 7.) Mr. J. II. Gregor}, ofMarblehead, Mass., has found a species of this geinis, which wemay call Cheyletus semmivorus (Plate 13, fig. 6). It injured theseeds of the cabbage stored up during the winter by suckingthem dry. Tlie genus Tiiroghjphus is known by the body beingelongated oval, with scissor-like
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
