ENTOMOLOGY

MYIASIS-ITS PREVENTION AND TREATMENT ~05then remove it through the hole in the skin. It may be necessary to enlargethe hole to get it out more easily. In the case of the Americanforms the bite from various bloodsucking Diptera should be prevented asfar as possible. Having the body well protected with clothing will alsoprobably reduce injury from both of these species. On account of theprobability that some of the African parasites of this class deposit eggson exposed clothing, especially if wet with perspiration, this should beguarded against.SPECIES CAUSING INTESTINAL AND UROGENITAl. MYlAsISCONTROL OF TRULY PARASITIC SPECIEs.-In Animals.-There arethree principal methods of attack against the bots of horses. The de-FIG. 40.-Nose protection for horse against attacks of the nose fly, Gastrophilushaemorrhoidalis. (Dove.)struction of eggs will accomplish much good in the case of Gastrophilusintestinalis and is applicable to some extent to G. nasalis, but apparentlycan not be practiced in G. haemorrhoidalis. Dove has found that thecommon practice of washing the legs of horses with kerosene oil hus butlittle beneficial effect. The creosote derivatives containing about twoper cent phenols destroyed the eggs readily. A miscible creosote compoundreduced with water to this strength and applied with a rag orbrush at the time the horses are groomed will destroy practically alleggs present. Such treatment repeated weekly should accomplish ulmostcomplete control. In this way horses and mules may be kept practicallyfree from infestation. Of course the grooming itself will tend to hatch