INSECTS.-GENUS CECIDOMYIA. 4$ 



chial apertures obliquely behind the mouth, on an ob- 

 liquely curved line, gradually decreasing in breadth to the 

 terminal one, which is small and more distant; ventral fins 

 narrow, a little elongated and obliquely truncated. Tail 

 attenuated, very slender, a little longer than the body, with 

 a small triangular fm at base, preceding the spine. 



Breadth two feet, length sixteen inches exclusive of 

 the tail; taken at Egg Harbour, New Jersey. 



Some account of the Insect known by the name of Hessian 

 Fly, and of a parasitic Insect that feeds on it. By Tko» 

 mas Say, — Mead June 2Ath^ 1817. 



Order DIPTERA. 



G^^2^/5 CECIDOMYIA. 



Genus Tipula, of Linne and Degeer. CHiRONa- 

 uus^ofFabr, 'Vrickocer a, oj La?ijarc/c» Ceci- 

 D M Y I A , of Latr. and Meigen. 



Antennae filiform, joints subequal, globular, hairy* 

 Proboscis sallient. Wings incumbent, horizontal. 



BESCRIPTIOM 



C. destructor. Head and thorax black; wings black, 

 fulvous at base; feet pale, covered with black hair. 



Inhabits the northern and middle states. 



Body clothed with short black hairs; head black; 

 antenna shorter than the body, somewhat smaller toward 

 the tip, verticillate, joints moniliform, separated by a hya- 

 line filament. Thorax gibbous, black, glabrous and 

 polished, Scutel^ prominent, colour of the thorax, round- 

 ed behind. JFings ciliate, rounded at tip, blackish, the 

 fulvous colour of the base is sometimes extended upon 

 the nerves of the \ving, paler and gradually disappearing 

 before the middle; longer than the abdomen, Feet long, 



