. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 102 EEPOET 108^ U. S. DEPAKTMEXT OF AGEICULTUEE. others are found in moss or on damp soil. Berlese has divided the genus into several; one of them, Trizetes, appears to be very distinct. Of Hermannia we have several spe- cies, mostly in the north; some have a curious, campanulate process on each side of the body. In recent yeai's Berlese has described many re- markable exotic forms in several new genera. Family HOPLODERMATIDJE. The Hoplodermatidae are separated from the genuine Oribatidse in having the
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 102 EEPOET 108^ U. S. DEPAKTMEXT OF AGEICULTUEE. others are found in moss or on damp soil. Berlese has divided the genus into several; one of them, Trizetes, appears to be very distinct. Of Hermannia we have several spe- cies, mostly in the north; some have a curious, campanulate process on each side of the body. In recent yeai's Berlese has described many re- markable exotic forms in several new genera. Family HOPLODERMATIDJE. The Hoplodermatidae are separated from the genuine Oribatidse in having the cephalothoi-ax movably attached to the abdomen. By this means the animal is able to roll up, concealing the legs. The legs of the Hoplodermatidae are attached to the body close together, and the whole sternal stnicture is soft and membranous, instead of coriaceous, as in the Oribatidae. The palpi are four-jointed. The dorsal plate of the abdomen extends down upon the sides, so that the venter is very narrow and almost wholly occupied by the large genital and anal aper- tures. Phthiracarus glabrata Say is one of our largest and most common forms, and is found on moist ground. The species of Hoploderma are most common in decaying wood or moss. T^Tien disturbed they roll up, "play possum," and are then not easily discerned. One of the species described by Riley was supposed to feed on the Phylloxera, but such is not the case, its food eA-idently being decayed vege- table matter. The young occur in the same localities as the adults. The nymph is a soft, yellowish-wliite creature, not unlike a Tyroghjphus. Tliey have long man- dibles, and can not fold up like their parents. Our forms have been described in. Fig. 20S.—HypochtJwnius texanus. (Original.). 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 B
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