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It has been stated on good evidence that a loss of �7,000,000 per annum was caused by the attack of the ox warble fly on cattle in England alone.

On several subsequent August days, while numbers of Caribou were passing very close to me, I detected no more of the warble flies.

The eggs of the warble flies hatch as a rule in about a week, the time varying with local conditions.

At that season the larvae of the warble fly have not developed far enough to have injured the hide appreciably.

Ox warbles are whitish or, when full grown, dark-colored grubs or maggots that develop from the eggs deposited on the hairs of cattle by certain flies known as warble flies.