. An introduction to zoology, with directions for practical work (invertebrates). 198 INTRODUCTION TO ZOOLOGY CHAP. pairs of legs (except in the Gall-mites), but acquires four pairs at the last moult before becoming adult. Some of the Acarina have a much elongated striated abdomen; these are the Gall-mites which produce little finger- like or pimple-like processes on the leaves of some trees, the "Nail Grails" on the lime, due to the mite Eriophyes (= Phytoptus) tiliae (Fig. 132); also the small "Eed Pimple" galls on sycamore and maple, due to Eriophyes macrorhynchus,
. An introduction to zoology, with directions for practical work (invertebrates). 198 INTRODUCTION TO ZOOLOGY CHAP. pairs of legs (except in the Gall-mites), but acquires four pairs at the last moult before becoming adult. Some of the Acarina have a much elongated striated abdomen; these are the Gall-mites which produce little finger- like or pimple-like processes on the leaves of some trees, the "Nail Grails" on the lime, due to the mite Eriophyes (= Phytoptus) tiliae (Fig. 132); also the small "Eed Pimple" galls on sycamore and maple, due to Eriophyes macrorhynchus, and similar pimple galls on the leaves of the sallow willow and the alder. Again, the swollen; arrested buds and distorted catkins sometimes found on hazel are due to the presence of species of the same genus of mite (Fig. 133). The Gall-mites are unlike other mites in having only two pairs of legs, which are placed very close to the head; the mouth-parts are cap- Fio. 133.âA hazel twig with able of biting. The galls formed are IZXTo^t^! '"â ""like insect galls in having only one single chamber, which is open below, the opening being guarded by hairs. In this cavity many mites live together, feeding on the hairs produced from the inner lining of the gall-cavity. Other mites, with short bodies, live on various animal and vegetable matter, the soft Cheese Mite on cheese; the " Beetle " Mite (so called from its hard skin) on dead wood or other decaying vegetable matter ; " Ticks^' on the blood of various mammals and birds, the skin of the infected animal being pierced by their jaws. Another mite causes the disease called " mange " in dogs. The Water Mites are larger, and are fairly common objects in a pond. Specially noticeable is the little scarlet water mite, less than ^ inch long, which swims so actively; the larva of this form sucks the blood of water insects and spiders, but the adult feeds on minute Please note tha
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1913
