6o Veterinary Medicine. 



being a spreading tumor in the seat of the bite, and progressive 

 and fatal emaciation and debility. Later observation by Baur, 

 Nocard, Leroy, Bruce, and Megnin show that the bite in itself is 

 not dangerous nor fatal, but that this, like other blood sucking 

 flies, becomes the medium for the transmission of fatal infections, 

 in this case the Trypanosoma Brucii the true cause of Nagana, 

 and that only those animals that are insusceptible to these in- 

 fections survive. 



LARV^ OF DIPTERA IN WOUNDS. FI,Y BIvOW, 



MYIASIS. 



Blowflies with larvae on dead meat, sores, or soiled skin or wool. Sarco- 

 phaga Magnifica : larva on horses, oxen, sheep, swine, dogs, camels, birds, 

 lyucilia Serricata : larva on sheep in Holland and England favored by 

 damp climate. Symptoms : leaves flock, mopes under bush, etc., dark wet 

 patch on tail or hips, wriggles tail, rubs, bites, tears out white tufts, open 

 sores or subcutaneous galleries show abundance of maggots, all sizes : death 

 in 24 hours or longer. L. Macellaria : Screw-worm ; worst in warm lati- 

 tudes ; attacks horse, ox, sheep and swine on soiled skin or wound. Cayor 

 fly. Prevention of fly-breeding ; drainage, kerosene, etc., on water, 

 fish or frogs, have dark covered pits for manure, add copperas, etc., turn 

 over cow manure in field, add parasiticide. Remove fly-shelter, brush, 

 weeds, coarse grass tufts. Exclude flies, darken building, screen, admit 

 light on one side only, admit air through bent tubes, enter the animals one 

 by one through a dark stall with light in box at ridge and brush them. 

 Kill flies in building by smoke from green vegetation, by chlorine, insect 

 powder, or quassia or tobacco water ; trap them in glazed lighted box in 

 wall of dark stable, etc. Protect animal's body by linen sheets, nets, de- 

 coction of walnut leaves, tobacco, ailanthus, quassia ; for sheep expel in- 

 testinal worms, remove soiled or wet wool, and apply parasiticides, creolin, 

 oil of tar, naphthalin, scrape out maggots, use phenated camphor, etc. 



The larvae of the blowflies of dead meat. Sarcophaga Car- 

 naria, Cynomyia Mortuorum, and Calliphora Vomitoria 

 {Blue Bottle) have not been proved to attack living animals. 

 The Sarcophaga Magnifica, however, the Lucilia (Campso- 

 myia) Macellaria, {Screw-worm) the L. Serricata and the 

 Achromyia Anthropophaga {Cayor Fly), raise their larvae on 

 sores. 



