. Ontario Sessional Papers, 1874, in the attacks of the larvae, until they naturally pass away, whicli will usually takeplace without serious injury. In exceptional and severe cases only, resort should be hadto special medicines of a dangerous or doubtful character, and then they should be givenif possible in accordance with the advice of a competent physician. No. 2.—The Ox Bot-Fly {(Estms bovis Latr.). This is a large and handsomely-col-oured fly. M. Joly describes it as having avery hairy body, a large head, the faceand forehead covered with light yellowhair, the eyes brown and the
. Ontario Sessional Papers, 1874, in the attacks of the larvae, until they naturally pass away, whicli will usually takeplace without serious injury. In exceptional and severe cases only, resort should be hadto special medicines of a dangerous or doubtful character, and then they should be givenif possible in accordance with the advice of a competent physician. No. 2.—The Ox Bot-Fly {(Estms bovis Latr.). This is a large and handsomely-col-oured fly. M. Joly describes it as having avery hairy body, a large head, the faceand forehead covered with light yellowhair, the eyes brown and the antennablack. The throat is yellow, barred withblack, the abdomen of a greyish white atthe base, covered with black hair on thethird segment, and the remainder of anorange yellow ; the wings are smokybrown. The fly appears during the summermonths, and the female lays her eggs onthe backs of cattle. There seems to bea considerable difference of opinion as tothe manner in which the egg is Bracey Clark holding very decidedly. Fig. 29. The Bot Fly. (EUrut, iovis. 825 37 Victoria. Sessional Papers (No. 1.) A. 1873 that the fly does not pierce the ekin of cattle with its ovipositor at all, but merely gluesits eggs to the hairs, while the grubs, when hatched, eat their way under the skin ; whileEeauniur asserts, on the contrary, that the mother fly deposits her eggs in the flesh all events, the grubs are found in large open tumours on the hacks of hornedcattle, making for themselves, says Reaumur, a place where food is found inabundance, where they are protected from the weather, where they enjoy at all times anequal degree of warmth, and where they finally attain maturity. Those parts of theanimals body in which the larvee are lodged can be easily recognized, as above each larvacan. be seen a tumour or bump, which has iDeen, not inaptly, compared to the swelling pro-duced on the forehead by a smart blow. In these larva; we find a double modification of struc
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