ENTOMOLOGY

~04 SANITARY ENTOMOLOGYstruction of ticks and mange mites on animals is important. Careshould be taken to guard against extensive saddle or harness sores onarmy animals.Methods of preventing blowing oi wool on sheep hardly need to bediscussed fully here. Shearing early in the spring, avoiding the soilingof wool, raising hornless breeds and the crutching, that is clipping thewool at the vent and behind the hind legs greatly reduces infestation.Treatment of Infesta.tions 1m, Man.-Nasal myiasis is the most difficultto handle. The larvIE should be removed mechanically as far aspossible. A number of different treatments have been resorted to, theadministra tion of chlorofornl into the nose being the most used. Afteralllarvre have been taken away, it is usually necessary to exercise care toprevent breaking of blood vessels which are frequently greatly exposedby destruction of the surrounding flesh. In most wounds the larvIE arequite easily removed. Of course the details of the care of the patientare to be determined by the physician in charge.Treatment of W ownds in Animals.-Chloroform is the most generallyused of all reagents and is usually satisfactory. The chloroform ispoured directly into the holes and the wounds closed up. This benumbsthe larvIE so that they can be taken out with a forceps. Carbon tetrachlorideis also satisfactory for this use and considerably cheaper.After the larvre have been taken out antiseptic astringent dressing shouldbe applied and pine tar or pine oil and vaseline applied to the outsideto repel flies. Oil of camphor is an excellent fly repellent and aids in thehealing process. Bleeding wounds should be dusted with tannic acidbefore applying the repellent.SUBDERMAL MIGRATORY SPECIESThe reduction of the number of ox warbles in cattle is importantfrom the standpoint of the raiser as well as to lessen the chances ofinfestation of man and horses. The most feasible method yet devisedconsists in the squeezing out of the larvIE from the backs of the animalsafter they have formed the subcutaneous tumors. This should be doneat intervals of about three weeks, all animals being gone over carefully.The period for beginning extraction varies according to latitude fromOctober 15 to March 1.The question of controlling Dermatobia hominis in tropical America,and also its African analogue, Cordylobia anthropophaga, has not beensufficiently worked out to make satisfactory recommendations. No doubtwhere livestock are under control, systematic extraction will reduce thenumber of these, both in animals and man. When humans become infestedit is usually advisable to allow the larva to become stationary and