393 



L. macellaria. The larva of this fly is the Ameri- 

 can ' screw worm,' infesting the nasal fossae and frontal 

 sinuses of man. 



(d) Genus Auchmeromyia. A. luteola. The larva 

 is the blood-sucking floor maggot of the Congo, etc. 



BLOOD-SUCKING GENERA 



(i) Genus Haematobia. (a) Palpi shorter than 

 proboscis, partly ensheathing it. (b) Labella fleshy, 

 easily visible, (c) Arista plumose dorsally ; three to 

 four hairs ventrally. (b) Third and fourth long veins 

 reach the a-pex of wing. Small mottled flies. 



Fig. 124. Shewing the first posterior cell open at the margin of the 



wing 



(2) Genus Lyperosia. (a) Palpi long and flat- 

 tened, ensheathing the proboscis, (b) Arista plumose 

 dorsally. (c) Wing as in Stomoxys. Differs thus from 

 Glossina. These flies are common on camels. 



L. irritans. Is the ' horn-fly ' termed H. s errata 

 in U.S.A. 



(3) Genus Beccarimyia. (a) Palpi shorter than 

 proboscis, (b) The first post-cell of the wing is closed 

 before the margin. 



