. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. Atax. -Tarsal claw of (Original.) Fig. 98.—Palpus of Atax. inal.) (Orig- Hydrachna, but these also have not been placed in modern genera. Many genera have been made for exotic species. The African fauna has been explored more thoroughly than the others, but most of the forms are similar to the European. Bargena is remark- able on account of its large, median ventral furrow. Family This is a small family of marine mites. They have a leathery skin, frequently granu- late or striate,
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. Atax. -Tarsal claw of (Original.) Fig. 98.—Palpus of Atax. inal.) (Orig- Hydrachna, but these also have not been placed in modern genera. Many genera have been made for exotic species. The African fauna has been explored more thoroughly than the others, but most of the forms are similar to the European. Bargena is remark- able on account of its large, median ventral furrow. Family This is a small family of marine mites. They have a leathery skin, frequently granu- late or striate, but commonly destitute of bristles. Sometimes there are coriaceous plates or shields. The body usually shows the division into cephalothorax and abdo- men, both above and below. The rostrum is often quite prominent, sometimes as large as in the Bdellidse. The cephalothorax usually has three eye-spots, one being located on the middle in front. The palpi are three or four jointed, the last article sharp-pointed at tip. The mandibles are rather prominent and end in a single straight or recurved claw. The legs are moderately long, rather widely separate at base, lateral or sublateral in origin, and end in two claws (fig. 99), They bear a few scattered bristles and sometimes dense plumes of fine hair. Some species have lam- ellae on their femora, similar to those in certain Ori- batidse, and the joints are swollen near tip as in' many Oribatidai. The genital opening is quite large and far back; the anus is small and at the tip of the abdomen. These mites have no trachea?, but do not appear to be related to other atracheate acarians, but rather to the Bdellidae and Oribatidae. It is perhaps not a natural family, but derived from several groups. The llalacaridae are found crawling slowly over algae, fi-equently in shallow water, but some have been dredged at considerable depths. The adults are free and feed on diatoms and other minute vegetation. The young of some forms feed on the
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