( 2Q5 ) 



ORDER VI. 



1NSECTA DIPTERA. 



The infedts belonging to this order have 

 two wings. 



They are furniftied with a poifer or ba- 

 lancer, (Halteres) fituate under each wing, 

 which is terminated by a capitulum or 

 knob. The bafe is concealed or fecured 

 under a little fcale, by which it is covered 

 as by a fhed. 



This order contains the following ge- 

 nera, viz. 



Genus I. Oestrus. 



Linn. Syft. Nat. Pag. 969. 



The Oeftrus has no mouth, in the place 

 of which three fmall imprefled points are 



found 



