. A text-book of agricultural zoology. Zoology, Economic. ACAEINA OR MITES. 107 all minute and transversely wrinkled. They have only four legs, the two hind pairs heing reduced to simple bristles. The mites live in the buds and leaves of plants, and produce galls. Family Trombididse.—The Eed-spider of the hop, Tetrany- chus telarius, may be taken to exemplify this family. They are extremely variable in colour, some being green, others rustyrred, others almost white; often dark specks are seen upon them, and in not a few instances brown individuals may be met with. This varied coloration is due
. A text-book of agricultural zoology. Zoology, Economic. ACAEINA OR MITES. 107 all minute and transversely wrinkled. They have only four legs, the two hind pairs heing reduced to simple bristles. The mites live in the buds and leaves of plants, and produce galls. Family Trombididse.—The Eed-spider of the hop, Tetrany- chus telarius, may be taken to exemplify this family. They are extremely variable in colour, some being green, others rustyrred, others almost white; often dark specks are seen upon them, and in not a few instances brown individuals may be met with. This varied coloration is due to both age and food. These mites are so minute that they can scarcely be seen on the. PiQ. 42.—Bed Spidbk {TetroMychus telarius). A, Eggs on leaf; B, larva; c, foot of mite; d, adult. leaves without a lens. This and some others of the genus spin webs of fine silk on the under-sides of the leaves. The legs, which are provided with bristles, take a prominent part in the weaving of this web, guiding the microscopic silken thread as it issues from the conical papilla near the anus of the mite. In and under this webbing the mites live and breed. The females lay their rather large globular eggs in this web. Some- times the ova are colourless, at others they have a golden hue. Incubation takes place in from six to eight days, the young or larval mite being colourless, and has only six legs. After repeated ecdyses, the normal number of legs is attained. All. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
