ZOOLOGY. 



m 



5. Tabaniis. Mouth with a fleshy strait proboscis^ termi- 



nating in two equal lips : antennce short, placed near 

 together ; in some species furnished with a projecting 

 tooth near their bases ; rostrum with two pointed 

 JeehrSy situated on each side^ and parallel to the pro- 

 boscis. 



Many of this tribe greatly resemble the last genus, they 

 are exceedingly troublesome to various kinds of Quadrupeds, 

 feeding on the blood which they suck out through their pro- 

 boscis ; their larvte are found in moist grass places. 



6. Culex. Gnat. Antennce filiform, in some species simple, 



in others, beautifully feathered ; either in whorls, as at 

 fig. 38, or simply feathered, as fig. 38, plate 3 ; mouth 

 consisting of setaceous piercers contained within a flex- 

 ible sheath. 



These well known insects derive their subsistence in the 

 manner of the preceding genus, by sucking the blood of large 

 animals ; in the larvas state they are aquatic, and feed on the 

 smaller kinds of water insects, which abound in stagnant 

 waters ; they are of very singular forms, and are objects 

 particularly suited for the Microscopic observer. 



7. Empis, Antennce setaceous y in others formed of three 



joints, the first of which is lanceolate, fig. 40, plate 3; 

 mouth formed of a horny inflected bivalve snout longer 

 than the thorax. 



These insects live like the preceding genera, by sucking 

 out the blood of other auimals. 



