. A text-book of agricultural zoology. Zoology, Economic. DIPTEEA OK TRUE FLIES. 229 apterous, as the sheep-tick and tee-louse. They are chiefly remarkable in that the female produces her young singly, not as an ovum but as a nearly mature larva or The Sheep-tick (Melophagus ovinus). Amongst the parasites which are so numerous and destruc- tive to sheep we find one of these Pupipara, the well-known Sheep Spider Fly, "Ked," or Sheep-tick (fig. 116), which, although never fatal in results, yet causes much annoyance to the ewes, and more still to the lambs. We find this pest
. A text-book of agricultural zoology. Zoology, Economic. DIPTEEA OK TRUE FLIES. 229 apterous, as the sheep-tick and tee-louse. They are chiefly remarkable in that the female produces her young singly, not as an ovum but as a nearly mature larva or The Sheep-tick (Melophagus ovinus). Amongst the parasites which are so numerous and destruc- tive to sheep we find one of these Pupipara, the well-known Sheep Spider Fly, "Ked," or Sheep-tick (fig. 116), which, although never fatal in results, yet causes much annoyance to the ewes, and more still to the lambs. We find this pest living amongst the wool, getting close to the skin when we try to catch them. In shape a sheep-tick is flat, with a squarish head, square thorax, and a flat bag-shaped abdomen. There are no wings or halteres, and the whole tick, especially the abdomen and legs, is very bristly. The colour is brown, greyish - brown on the abdomen. The feet have a pair of strong hooked claws, each with an accessory side claw and a feathered bristle. The sheep-tick lays her puparia, not eggs, amongst the fleece. The true ova hatch in the body of the female and develop there, until the puparium state is assumed, when each puparium is passed out as a bright, shiny, chestnut- brown body, oval in form, with truncate ends. When the female deposits a puparium she fixes it to the wool by a gluey substance, so that it cannot fall ofl". Taschenberg says each female may produce eight such puparia; the author has found that seldom more than four are so produced. The spider-like fly comes from these shiny, glass-like puparia in from Fig. 116.—Sheep-tick (Mdophagus ovinus), A, 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
