145 



Examples, *Musca gibsoni. Feeds in association with 



Stomoxys. 

 *Musca corvina (The Raven-fly). 



Group III. The non-blood-sucking Muscidae. To this group 

 belong house-flies and others which have a soft vertical 

 sucking proboscis, and which swarm on food and filth 

 of every kind, and which by reason of their gross feeding 

 habits and their ubiquity are active agents in the spread of 

 zymotic disease. 



Examples, Musca domestica (The Common House-fly) 

 carries the bacillus typhosus of enteric 

 or typhoid fever ; is also a disseminator 

 of cholera, dysentery, and infantile 

 diarrhoea. 



Calliphora (Blow-fly or " blue-bottle "). 

 The larvae (normally useful scavengers) 

 sometimes cause cutaneous myiasis in 

 Man and animals. 



Chrysomyia, syn. Compsomyia macellaria 

 (The Screw-worm Fly). Brazil and 

 other parts of Tropical America. Lays 

 its eggs in wounds and sores and in the 

 nasal cavities, and the "j~larvae cause 

 serious myiasis in Man and animals. 

 Auchmeromyia luteola. Nigeria to Natal, 

 especially Belgian Congo. Lives in the 

 darkest parts of the natives' huts. The 

 *larva, the '"''Congo Floor-maggot" is 

 blood-sucking ; it shelters under the 

 sleeping mats during the day, and 

 attacks the resting inmates at night. 

 Cordylobia anthropophaga (The African 

 Thumbu or Cayor Fly). The flarva, 

 the " cayor maggot" is a subcutaneous 

 parasite in Man and animals ; it causes 

 painful boils or warbles. 



Family Anthomyidae. Homalomyia, syn. Fannia scalaris (The 

 Latrine-fly). " A dangerous diseminator of intestinal disease 

 in villages and camps." 



"^Family Hippoboscidae. Flies of crawling habit. Proboscis 

 protrusible. Larviparous. Blood -sucking ectoparasites of 

 birds and mammals, sometimes attacking Man. 



Examples, *|Hippobosca rufipes. (See page 45, 



Part /., " Catechism," Zoology.) 

 *|Melophagus ovinus (The Sheep-tick, 

 louse or Ked). Wingless. Sometimes 

 attacks Man (sheep-shearers). 



