The True Flies 



Super-family PHOROIDEA Coq. 



29 Wings furnished with more than two longitudinal veins, 

 fourth vein coalescing with the fifth beyond the apex of 

 the second basal cell, then separating into three branches, 

 axillary lobe and cell wanting, anal cell very narrow. . . 

 Family Lonchopteridce. 



Wings furnished with two longitudinal veins, situated near 

 the costa, the second vein sending three or four indistinct 

 veins obliquely toward the posterior margin of the wing 

 Family Phoridce. 



Section CYCLORHAPHA Brauer. 



30 Anal cell present, distinctly longer than the second basal, the 

 discal cell sometimes wanting, both basal cells usually 

 present (Super-family Syrphoidea) 31 



Anal cell, when present, shorter than the second basal, but 

 one or both of these cells frequently wanting (Super- 

 family Muscoidea) 34 



Super-family SYRPHOIDEA Coq. 



31 Proboscis short and robust, no supernumary vein between 

 the third and fourth veins 32 



Proboscis slender and elongate or the wings provided with 

 supernumary vein between the third and fourth veins. 33 



32 Head less than one-half as long as the thorax, the face and 

 front broad Family Platype^idce. 



Head unusually large, nearly as long as the thorax, except 



on the occiput almost wholly covered by the eyes 



Family Pipunculidce. 



33 With a supernumary vein between the third and fourth veins, 

 crossing the small cross-vein, the proboscis usually short 

 and robust Family Syrphidce. 



With no supernumary vein, the proboscis very slender and 

 elongate Family Conopidce. 



Super-family MUSCOIDEA Coq. 



34 Lower, or posterior, calypter distinct, usually projecting 



beyond the upper (Group Calypter atoe) 35 



89 



