. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 104 REPOET 108^ U. S. DEPARTMEXT OF AGRICULTURE. the stigmata are on the underside of the mandibles. He also found Ihdng unliatched eggs within the body of the dead mite. Similar cases are kno\rn in the Oribatidae. Superfamily SARCOPTOmEA. Family TARSONEMID^. This is a small family, but of much biological and economical interest. They are soft-bodied mites and in some ways resemble the TjToglj'phidae, but the females differ fi-om them, as well as from all other Acarians, in having between legs I and II
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 104 REPOET 108^ U. S. DEPARTMEXT OF AGRICULTURE. the stigmata are on the underside of the mandibles. He also found Ihdng unliatched eggs within the body of the dead mite. Similar cases are kno\rn in the Oribatidae. Superfamily SARCOPTOmEA. Family TARSONEMID^. This is a small family, but of much biological and economical interest. They are soft-bodied mites and in some ways resemble the TjToglj'phidae, but the females differ fi-om them, as well as from all other Acarians, in having between legs I and II a prominent clavate organ of uncertain use. The mouth parts (fig. 213) are formed for sucking, and the mandibles are very slen- der and needle-like. The palpi are mi- nute and barely Aisible. There are tracheae wliich open on the ventral surface near the base of the rostrum. The legs are short and composed of five or six joints; the an- terior tarsi terminate in one claw, the others usually have two claws and often a sucker. The posterior pairs of legs are quite remote from the anterior pairs; in the males of Tar- sonemus they are almost at the tip of the body. In some species the abdomen shows traces of segmentation by the presence of a few transverse lines on the dorsum. The anal opening is at the end of the (Au- FiG. 213.—Beak and claw of Fcdiculuidcs. thor's illustration.) The genital opening in Tarsonemus is a small, elongate aj^erture near the liind coxae. The body and legs are proAdded -^ith a few simple hairs. In several genera of the family, notably in Tarsonemus, there is a marked difference in the structure of the. 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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