6 DIPTERA 



Braciiyceea — continued. 

 B. Third joiut of the antenna; simple. 



a. Basal cells large. 



* Thorax and abdomen inflated. Ci/rtidm or Iiijiatm. 

 ** Thorax and abdomen not inflated. 



1. Empodium pulvilliform. 



Tibia} spurred. LeptidcB. 



Tibia; not spurred. Sermoneuridce. 



2. Empodium styliform ; legs with bristles. Asilidcb. 



3. Empodium none. 



t Discoidal vein with two branches. Theremdce. 

 ft Discoidal vein with one branch. Bombylidce. 

 ttt Discoidal vein unbranched. 



:|: A spurious vein between cubital and discoidal. Syrphidce. 

 XX No spurious longitudinal vein. 



^ Cubital forked. Scenopinidcu. 

 T[*ir Cubital simple. 



a. Discoidal simple. 



Antennal bristle thick. Myopida. 

 Antennal bristle thin. Platypezidce. 

 /8. Discoidal forked or absent. 



Antennal bristle basal. FipuncuUdcE. 

 Antennal bristle apical. Lonchopteridce. 



4. Empodium membranaceous and linear. 



t First joint of antennae very short. Tachydromida;. 

 ft First joiut of antennae moderate. 



Posterior transverse vein oblique to the posterior border of the wing. 



HyhotidcE. 

 Posterior transverse vein parallel to the posterior border of the wing. 

 EmpidcB. 



b. Basal cells short. 



* Discoidal and basal cells united. DolicJiopodidcs. 

 ** Discoidal and basal cells separate. 



1. Antennae in rounded pits. (Estridce. 



2. Antennae not in rounded pits. 



t First posterior cell closed or nearly closed. MiiscidcB. 

 tt First posterior cell widely open. 



Tegulae developed. Anthomyzidce. 



Tegulae rudimentary or none. Acalyptrida. 



Family — Mttscid*:. 

 Analysis of the Sub-families. 

 Bristle of antennae bare or pubescent ; legs short. TacMnincB. 

 Bristle of antennae hairy or pectinated ; legs long. Dexince. 

 Bristle of antenna? plumose or hairy, with the tip bare. Sarcophagince, 

 Bristle of antennae entirely plumose or pectinated. Muscina. 



