Mufca. DIPTERA. 215 



3. Conops: which genus is diftinguifhed by 

 the following characters : 



The mouth armed with a quadrifcted roftrum, 

 two of which fetae are longer than the others ; 

 the {heath of the roftrum is retractible, fiefhy, 

 and terminated by lips : the upper lip is formed 

 by two lobes, the under one is bifid. 



The fetae or biiftles above-mentioned, are fi- 

 tuate, in this and the following genera, at the 

 bafe, and extended longitudinally towards the 

 extremity of the roftrum. 



The Conops is formed in part from fuch 

 Linnsean Mufcse as have a lateral feather, in 

 part from fuch as have a lateral hair on their 

 antennas ; and Scopoli has divided them, from 

 that circumftance, into two families. 



4. Anthrax: the mouth of the Anthrax is 

 armed with a bifeted roftrum ; the fbeath is 

 fleftiy at its bafe, and retractible •, its extremity 

 is fimply dilated, not divided into lips, as in the 

 Conops. 



The palpi are feated in the middle of the 

 roftrum. 



O 4. Scopoli 



