BKACl[yCEIlA. 



in the 4tli vein ; 3rd vein simple except in a few 

 Empid^ ; posterior cross-vein quite absent ; 

 posterior cells apparently never more than four, 

 but usually less ; wing-veins altogether few and 

 simple ; alula obsolete. Face bare or only 

 slightly pubescent in the Mickophona, but 

 with peristomal bristles in Lonchoptemd^ and 

 side or genal bristles in Pkojiivje, but with 

 no face beard or pubescence as in Asilid^e. 

 Cephalic bristles usually strongly developed. 

 Species always small and distinctly chseto- 



phorous 5. 



Aerial species, almost always clothed with dense 

 furry pubescence. Legs thin and only suitable 

 for alighting, and consequently armed with little 

 more than spicules (not true bristles) on the 

 femora and tibia?. Eyes nearly always touching 

 in the cj" (holoptic) and never bulged out because 



of a sunken vertex Tromoptera. 



Pedestrian species, usually armed with strong bristles 

 and only occasionally {LapJtria, Isopvgon, etc.) 

 clothed with dense coarse pubescence ; or (Der- 

 matina) bare of both pubescence and bristles. 



Legs strong, usually armed with strong bristles 

 on at least the tibiae and t<irsi. Eyes almost 



always widely separated in both sexes (dichoptic), 



and frequeiitly bulging out because of the deeply 



sunken vertex 4. 



Eremochsetous species in the sense that tliere are 



no strong bristles on any part of the thorax or 



scutellum Dermatina. 



Cheetopliorous species in the sense that tliere are 



strong and usually numerous bristles on the 



thorax, scutellum, and legs, or at least on the 



sides of the metanotum, except in the feAv cases 



in which dense coarse pubescence is substituted. Energopoda. 

 Wing-veins (including cross-veins) I'airly normal, or 



else the 2nd and 3rd veins extended almost to 



the wing-tip. Antennse with three (or rarely 



two) joints obvious, besides any style or arista.'. (J. 

 Wing-veins extremely abnormal and quile distinct 



from those of any other Diptera {Gxceytt Aspistes 



in the Bieionid.e) ; anterior veins up to the 



3rd vein strong and conspicuous, running into 



the basal half of the costa, but the subsequent 



veins very faint and incomplete and abnormally 



directed ; 4th, .5th, and anal veins very difficult 



to trace. Palpi porrect, not jointed. Eyes 



widely and equally .separated in both sexes. 



Antennae apparently composed of one large joint, 



which bears a very long apical or dorsal arista. 



Hind legs long and the femora flattened IIypocera. 



AVing rounded at the tip ; venation fairly normal, 



with the 2nd vein ending considerably before 



the wing-tip, and with at least one apparent 



cross-vein well out towards the middle of the 



wing, causing the discal cell to be present even if 



