INS E C TS 
\ 
ORDER 
DIPTERA. 
OESTRUS. OESTRUS, 
Generic Character. 
K 
Antennae triarticulatae, bre- 
vissimge, demersae. 
Fades lata, depressa, vesi- 
culosa. 
Os foramen simplex. 
Palpi duo, biarticulati, de- 
mersi. 
Cauda inflexa. 
Antenna triarticulate, very 
short, sunk. 
Face broad, depressed, vesi- 
cular. 
Mouth a simple orifice. 
Feelers two, biaxticulate^ 
sunk. 
Tail inflected. 
TThE genus Oestrus or Gad-Fly is remarkable, 
like that of Ichneumon, for the singular residence 
of its larvae; viz. beneath the skin, or in different 
parts of the bodies of quadrupeds. 
