. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. TRACHEARIA THE WATER-MITES. 387 character is founded the subdivision of the class into pul- monary and tracheary Arachnida. 650. The majority of the Arachnidce feed upon insects, which they seize alive, or upon which they fix them- selves, and from which they suck the juices. Others live as parasites upon the bodies of vertebrated animals. There are some, however, which are only found in flour, cheese, and upon various vegetables. These last, which mostly belong to the tracheary order, exhibit an affinity to in
. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. TRACHEARIA THE WATER-MITES. 387 character is founded the subdivision of the class into pul- monary and tracheary Arachnida. 650. The majority of the Arachnidce feed upon insects, which they seize alive, or upon which they fix them- selves, and from which they suck the juices. Others live as parasites upon the bodies of vertebrated animals. There are some, however, which are only found in flour, cheese, and upon various vegetables. These last, which mostly belong to the tracheary order, exhibit an affinity to in- sects, not only in their structure, but in their metamor- phosis ; for they undergo great changes after they come out of the egg, an additional pair of legs being often de- veloped, whilst in the others nothing else than a moult, or casting of the skin, occurs. Order I.—Trachearia. 651. The Trachearia, being the most nearly allied to Insects, are naturally the first to be considered. This order contains several remarkable forms, of which the one best known is that of Acarid^e, or Mites, the majority of the species of which, however, are very minute, or almost microscopical. They are very extensively distributed ; some being wanderers under stones, leaves, the bark of trees, in the ground, or upon arti- cles of food ; whilst others subsist as para- A sites upon the skin and in the flesh of dif- (Mite) magnified. ferent animals, often greatly weakening them by their ex- cessive multiplication. There are some species which in- fest insects, especially the carrion beetles. Some of this tribe much resemble spiders inform and habits, as, for in- stance, the acarus telarius, the red spider of hothouses, which forms upon the leaves of various vegetables, espe- cially lime-trees, webs which injure them greatly. The , of which the various species, known under the name of Ticks, are so annoying to some animals, also be- long to this group. Although naturally much flattened in f
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