. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. ISO INJURIOUS AND USEFUL INSECTS with head outstretched and tail turned over the back, seeking above all things to plunge into water, whither the fly does not follow them. This belief is probably due to a confusion between warble-flies and gad-flies. The galloping cattle have been terrified by the blood-sucking Tabanus bovinus. The warble-fly possesses no instrument capable of inflicting a wound. It has lately been said that the larvae reach the skin of the ox in late
. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. ISO INJURIOUS AND USEFUL INSECTS with head outstretched and tail turned over the back, seeking above all things to plunge into water, whither the fly does not follow them. This belief is probably due to a confusion between warble-flies and gad-flies. The galloping cattle have been terrified by the blood-sucking Tabanus bovinus. The warble-fly possesses no instrument capable of inflicting a wound. It has lately been said that the larvae reach the skin of the ox in late winter, after a long course of wanderings through the tissues of the host, and that the eggs are not laid in or near the back, but on the legs, and especially on the feet. They are said to be transferred to the mouth by licking, and make their way thence to the gullet of the ox. Dr Cooper Curtice* found the young larvae of the common American warble {If. lineatd), which is also British, in the gullet of the ox; this was in November, when there are none on the back. He believes that they make their way from the gullet to the back through the tissues of the ox, and declares that the young worms have been found near the ribs and in the muscles. When they reach the skin of the back, he supposes, they bore a hole in it for the purpose of respiration. It is only then that the skin of the larva becomes conspicuously spinous as a con- sequence of a moult; in the wandering larvas the skin is nearly smooth, except at the two ends of the body. It is highly probable that the method pursued is identical in H. bovis and H. lineata. The first out- ward sign of the parasite is a small lump, due to the gorging with blood of the connective tissue beneath the skin of the back. By February or March the maggot has grown considerably; it is now of a brownish tint; the cavity in which it lies is filled with pus; the passage has enlarged and the warble becomes open. From this time the larva steadily
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1902
