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I throw this hook of a fang over your neck to keep you from falling off." Word went back to the house-fly's family, and a choir of great green-bottled insects sang this psalm at the funeral: "An unfortunate fly a-visiting went, And in a gossamer web found himself pent."
When this is fully extended it is somewhat longer than the head; when not distended and in use it is doubled back in the cavity on the under side of the head. These are covered with many fine corrugated ridges, which under the microscope look like fine spirals and are known as pseudotracheæ. Thus it will be seen that the house-fly's mouth-parts are fitted for sucking and not for biting.
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