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According to Osler, in parts of Central America, the eggs of a bot-fly, called the dermatobia, are not infrequently deposited in the skin, and produce a swelling very like the ordinary boil. Matas has described a case in which the estrus larvae were found in the gluteal region.
A case is spoken of by Curran, which was seen by an army-surgeon in a very aged woman in the remote parts of Ireland, and another in a female in a dissecting-room in Dublin. The tissues were permeated with lice which emerged through rents and fissures in the body. Instances of the larvae of the estrus or the bot-fly in the skin are not uncommon.
This is true of the larva? of the sheep bot-fly, which develop in the sinuses of the head, causing severe inflammation of these parts, nervous symptoms and death. The character of the symptoms of a parasitic disease depends on the habits of the parasite, and the tissue or organ, that it may attack. The parasitic flies belong to the order Diptera, and the families Muscidae and OEstridae.
TREATMENT OF BOT-FLY DISEASES. The treatment of the different bot-fly diseases is largely preventive. This consists in either the destruction of the eggs or the larvae.
The parasitic life of the bot-fly of sheep results in a severe catarrhal inflammation of the mucous membrane lining the sinuses of the head, and a discharge of a heavy, pus-like material from the nostrils. The irritation produced by the larvae may be so serious at times as to result in nervous symptoms and death.
The different methods of destroying the eggs of the bot-fly of the horse are clipping the hair from the part, scraping off the eggs with a sharp knife, or destroying them by washing the part infested with eggs with a two or three per cent water solution of carbolic acid. This should be practised every two weeks during the period when the female deposits the eggs.
But all it lacks in variety of kinds it more than makes up in number of individuals, especially in the detestable trio of bot-flies, blackflies and mosquitoes. The bot-fly infests the caribou and will probably infest the reindeer. The blackfly and mosquito attack both man and beast in maddening millions. The mosquito is not malarious. But that is the only bad thing he is not.
Give the life history of the bot-fly of the horse; of the ox; of sheep. Give the symptoms of bot-fly diseases. Give the symptoms of lousiness. Give treatment for lousiness of different farm animals. What is the damage from the sheep-tick? Give treatment. Describe the injury from scabies and mange. Give treatments for these diseases. Mention the several poultry mites and tell how to treat them.
Fabre gives a curious exposition of "that strange art" by which the grub of the grey bot-fly, the vulgar maggot, by means of a subtle pepsine, disintegrates and liquefies solid matter; and it is because this singular solvent has no effect upon the epidermis that the fly, in its wisdom, chooses by preference the mucous membranes, the corner of the eye, the entrance of the nostrils, the borders of the lips, the live flesh of wounds, there to deposit its eggs.
Horses seem to have an instinctive fear of them and will do all in their power to get rid of the annoying pests. The eggs of the house bot-fly are laid on the hair of the legs or some other part of the body. The horse licks them off and they hatch and develop in the alimentary canal of their host.
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