. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. anal openings, both quite elongate. The young resemble having but six legs. This family was formerly called generic name Erythraeus was first applied to mites of lophidse. Ei-yihacai-us Berlese is the same as Tarsotomus. There are several genera and sub- genera, the more prominent of which are tabu- lated below: 1. Palpi without claw at tip, no visible "thumb"; body short and rounded; coxse all approximated Anystis. Palpi with a claw to last joint, not counting the '' thumb " 2 2. Thumb o
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. anal openings, both quite elongate. The young resemble having but six legs. This family was formerly called generic name Erythraeus was first applied to mites of lophidse. Ei-yihacai-us Berlese is the same as Tarsotomus. There are several genera and sub- genera, the more prominent of which are tabu- lated below: 1. Palpi without claw at tip, no visible "thumb"; body short and rounded; coxse all approximated Anystis. Palpi with a claw to last joint, not counting the '' thumb " 2 2. Thumb of palpus very small, indistinct; tarsi all simple; parasitic on reptiles. 3 Thumb of palpus very large, plain; tarsi often long, sometimes curved, or with false articulations; coxse ap- proximate; body elongate; free- living Tarsotomus. 3. Coxse approximate; body broader than long Gekohia. Coxse in two groups; body elon- gate Pterygosoma. Anystis and Tarsotomus are free and preda- ceous, feeding on any small insects or acari that they may come across. Their movements Fig. SQ.—Tarsotomus spinatus. (Author's are excessively rapid and erratic, sometimes lUustration.) whirling about in a zigzag course like a particle of dust blown by the wind. In Anystis the body is triangular and the palpi are four-jointed. In Tarsotomus the body is more elongate, and the palpi five-jointed. Our one species of Anystis, A. agilis Banks, is commonly found running over the leaves of herbs and shrubs in the search for prey. It is red in color. I have seen it fee'd onaphides, on small caterpil- lars, and on the young larvae of the currant sawfly. The young before transformation spins a white silken web on a leaf or in a crevice of bark, and beneath it changes to the adult form. Species of Tarsotomus (fig. 36) are known to occur about houses, but most of them live on trees. They are usually red in color, but some are marked with white spots and stripes. They are not very common in our country, only tw
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