110 CLASS VIII. ORDER XII. 



ASILUS, (hornet-fly,) mouth with a straight- 

 horny, bivalve snout. 



EMPIS, mouth with a horny, inflected, bivalve 

 snout, longer than the thorax, with horizontal 

 valves. 



BOMBYLIUS, (humming-fly,) mouth furnished 

 with a very long porrected, setaceous, bivalve 

 trunk ; with horizontal valves including setace- 

 ous piercers. 



TABANUS, (ox-fly,) mouth formed into a fleshy 

 proboscis, terminated by 2 lips ; rostrum furnished 

 with 2 pointed palpi, placed on the side of, and 

 parallel to, the proboscis. 



CONOPS, mouth with a porrected, jointed snout* 



OESTRUS, (gad-fly,) antennae triarticulate, very 

 short, sunk ; face broad, depressed, vesicular ; 

 mouth a simple orifice ; feelers 2, biarticulate, 

 sunk ; tail inflected. 



Muse A, (house fly,) mouth formed into a fleshy 

 proboscis, with 2 lateral lips ; palpi none. 



DIOPSIS, (stem-eye,) antennas very small, seta- 

 ceous, eyes situated on very long footstalks. 



HIPPOBOSCA, (horse-fly,) mouth furnished with 

 a bivalve, cylindric, obtuse, na,tant snout ; body 

 depressed ; feet furnished with several claws. 



