35. 
38. 
39. 
40. 
4I. 
42. 
43. 
FAM. EMPIDID/E 
eyes of the female broadly separated ; usually more than one 
presutural bristle present. : 
Eyes of the male broadly contiguous, the "s Sacs er io 
he lower ; hind femora uot thichened ; 
Eyes separated, varely approximated in the male on the middle 
of the front,always with small uniform facets; hind femora 
thickened : 
Discal cell apically blunt ; da of the M feosalà TEUER more or n 
pennate, of the male the front or hind meltatarsi or both 
more oy less enlarged ; generally smaller. species. (Pl. 5, 
Fig. 48, 49) UU Pau 
Discal cell apically more ov less narrowed ; legs of the female not 
pennate ; of the male the melatarsi not thickened 
Delicate, slender, long-legged species; face narrow, palpi bare, 
jroboscis very long and thin, projecting obliquely forward ; 
: (horax not. pubescent, acrostichals few; pygidium small and 
terminal; leg bristles undeveloped.. eo 
Robust, generally larger species; face broad, falbi ovali Musei; 
hairy ; thorax usually pubesceni ; bygidium stout ; legs bristly. 
Segments of the abdomen with strong lateral bristles; humeral, 
Bropleural and. metapleurval bristles very strong 
Abdominal segments without strong bristles; humeral, propleural 
and metapleural bristles not unusually strong. (Pl. 5, 
Fig. 47) . ips 
Third antennal joint greatly lengthened, the antenne about iwice 
as long as head ; ocellar triangle not vaised, the ocellar bristles 
weak; body narrow, legs slender; no evident dorsocentrals or 
acrostichals; wings small, with very obtuse to rectangular 
axillar incision, alule almost wanting ; eyes of male separated. - 
Third antennal joint not lengthened, the antenne less than twice 
as long as the head ; ocellar triangle developed, with. evident 
ocellar bristles . ZO RES LRTIUDES MEE 
Small delicate species with long slender legs; dorsocentral bristles 
in a single vow, acrostichals present or absent ; color of thorax 
differing in male and female, ov. uniformly yellow in both 
sexes, axillar incision of wings blunt to somewhat pointed ; 
eyes of male contiguous; Pygidium small and closed 
Body more robust; legs stronger, acrostichals Present ; thorax of 
male and female similarly colored, varely (in. American 
species) yellow . : à / 
Axillar incision of wings obtuse to vectangular, varely somewhat 
pointed ; pygidium usually open, penis often filiform and 
projecting ; hind. femora not spinose beneath... . : 
Axillar incision rather acute; bygidium rather small or else 
strongly bulbous, penis usually shorl and thick, rarely filiform 
and. extended 
85 
3. 
38. 
40. 
Subgenus Ewris, Linnzus, s. str. 
39. 
Subgenus AcarLowyiA, nov. subgen. 
Subgenus PrarvPrERA, Meigen. 
Subgenus PorvsLEPHARIS, Bezzi. 
Subgenus PacuvwuEnia, Stephens. 
Subgenus LuNDSTROEMIELLA, Frey. 
42. 
Subgenus HorocrEna, Schiner. 
43. 
44. 
45 
