. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACARINA OR MITES. 115 ' recorded that one species {E. berghi Jensen) lives parasitically in the ogg capsule of a horse-leech in Denmark. From the egg hatches the six-legged lan^a, which soon molts into the nymph. The latter devours the embryonic leech and then passes into a hypo- pus. This escapes from the capsule, attaches itself to an insect, and, on I reaching suitable locality, molts into : a full-grown nymph. The latter cuts through the capsule, enters, and there transforms to the adult mite. H
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACARINA OR MITES. 115 ' recorded that one species {E. berghi Jensen) lives parasitically in the ogg capsule of a horse-leech in Denmark. From the egg hatches the six-legged lan^a, which soon molts into the nymph. The latter devours the embryonic leech and then passes into a hypo- pus. This escapes from the capsule, attaches itself to an insect, and, on I reaching suitable locality, molts into : a full-grown nymph. The latter cuts through the capsule, enters, and there transforms to the adult mite. Here reproduction takes place, and the life cycle begins anew. One species, H. tarsalis Banks, has been found in the nests of rats in Cali- fornia, and the hypopial form at- tached to the rat fleas. The gen as Glyciphagus does not appear to be as common in this coun- try as in Europe; possibly owing to their minute size they have not been collected. A few species, of rather modest appearance, arc known to me. One (fig. 232) has long plumose hairs on the body, and was found in seeds. In Europe sev- eral species appear to be common in houses and other buildings. Some species are pro^ided with many broad scalelLke hairs. In all the forms the skin is finely granulate, which character serves to distinguish. Fig. 237.—RhizogJypMs rliizovTiagus. (Author's illus- tration.) it from all other tyroglyphids. The original species of the genus (as indicated by the name) and some others have been found in sugar. The mites sometimes spread to the hands of those handling such materials, and produce a skin disease known as ''grocer's ; Michael has described two remarkable forms which he discovered in the nest of the mole. The body is broad, flat, and the margins crenulate and provided with spines. They do not occur in deserted nests, but their relation to the mole is unknown. They may, perhaps, form a distinct genus. The curious genus LabidophoriLS (fig. 233) has not been found in thi
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