Afilus. D I P T E R A. 



227 



Genus VIII. Asilus; 

 Linn. Syft. Nat. page 1006. 



The roftrum of the Afilus is hard, or 

 horny, porredted, extended out its whole 

 length, and bivalve, 



Scopoli has arranged manyof the Linnsean 

 Afili under the genus called by him Erax> to 

 which he afllgns the following chara&ers : 



The mouth armed with a trifeted probofcis, 

 or on the bafe of which are feated three briftles, 

 two of which are fhorter than the others, on 

 which the palpi are often feated. 



The fheath, which does not exceed the head 

 in length, is compofed only of one valve. 



The Afilus of that author differs from his 

 Erax chiefly in the form of its probofcis, which 

 contains four fetas, or briftles t, the fheath is por- 

 redted, ftiff, longer than the head, and bi- 



p % Schseffer 



