by
I.Ya. Grichanov
3.
Face black, sometimes seems to be whitish or greyish from lateral view
... 4
–
Face silvery white ... 9
4.
Cercus bifurcated ... 5
–
Cercus simple, long and narrow ... 8
5.
Mid coxa without ventral spine, with several black setae only; femora black;
surstylus acicular; 3.5-4.5. Fig. 168 ... nasutum (Fallén)
–
Mid coxa with ventral setae forming spine ... 6
6.
Fore basitarsus longer than rest tarsomeres combined, with several long
setae at apex; legs mostly black; surstylus narrow, pointed at apex; 4.5-6.0.
Fig. 177... commune (Meigen)
–
Fore basitarsus shorter than rest tarsomeres combined ... 7
7.
Fore and mid tibia dark; fore basitarsus straight, without strong setae;
fore femur with black hairs; surstylus long and narrow, with short basodorsal
projection; 4.5-5.6. Fig. 162...
glaciale
(Ringdahl)
–
Fore and mid tibia yellow; fore basitarsus curved, with row of strong setae;
fore femur with row of very strong black setae; cercus short and broad;
surstylus narrow, pointed at apex; 4.5-4.9.Fig.
170 ... pectinatum (Loew)
8.
Hind tibia strongly thickened at apex, whitish-yellow in basal half, black
in distal half; fore tarsus simple; surstylus broad, triangular; 3.7-4.3.
Fig. 160 ... fascipes (Meigen)
–
Hind tibia not thickened or slightly thickened; 2nd segment
of fore tarsus flattened at base, slightly thickened at apex; surstylus
bladelike, long, with strong seta at apex; 4.7-5.3. Fig. 167 ... nigribarbatum
(Becker)
9.
5th segment of mid tarsus strongly widened ... 10
–
5th segment of mid tarsus weakly widened or simple ... 11
10.
4th segment of mid tarsus not widened; 5th segment
of same tarsus widened and flattened; cercus triangular, moderately long;
surstylus baculiform, curved; 4.4-5.1. Fig. 154 ... confine Zetterstedt
–
4th and 5th segments of mid tarsus widened; cercus
bifurcated at middle; surstylus narrow; 4.4-5.2. Fig. 153 ... crassipes
(Meigen)
11.
Mid coxa with ventral setae forming spine ... 12
–
Mid coxa without spine ... 17
12.
Mid coxa with ventral spine of light setae; fore basitarsus widened; mid
femur yellow; cercus foliaceous, with long hairs; surstylus baculiform;
4.8-5.7. Fig. 152 ... basale Loew
–
Mid coxa with ventral spine of dark setae ... 13
13.
Fore basitarsus simple, usually slightly longer than 2nd tarsomere
... 14
–
Fore basitarsus thickened, usually 1.5 times longer than 2nd
tarsomere ... 15
14.
Postpedicel 3.5 times longer than high at base and longer than stylus;
cercus elongate-triangular, reddish-yellow; surstylus spoon-like at apex,
with apical setae; 3.1-4.4. Fig. 164 ... laticorne (Fallén)
–
Postpedicel no more than 3 times longer than high at base, distinctly shorter
than stylus; cercus bifurcated; surstylus narrow, slightly widened in distal
half; 3-3.4. Fig. 173 ... rivale (Loew)
15.
Cercus bifurcated; surstylus acicular; femora yellow; 4.3-4.7. Fig. 161
... holmgreni
(Mik)
–
Cercus simple ... 16
16.
Femora mostly black; stylus slightly thickened at apex; cercus long and
narrow, bandlike, with apical seta; surstylus pointed at apex; 4.6-5.4.
Fig. 169 ... patulum
(Raddatz)
–
Femora reddish-yellow; cercus long, gradually narrowing apicad; surstylus
moderately long, baculiform; 5.6-6.9. Fig. 157 ... elegantulum (Meigen)
17.
Fore femur with ventral row of strong setae, half as long as diameter of
femur; fore basitarsus with short erect hairs; cercus short, triangular,
with broad straight distal margin; surstylus lanceolate; 3.5-4.8. Fig.
155 ... discolor
Zetterstedt
–
Fore femur with ventral hairs only, without strong setae ... 18
18.
Cercus trilobate; surstylus narrowing at middle, with basodorsal projection;
femora mostly dark; 4.4-5.0. Fig. 175...
tridactylum
(Frey)
–
Cercus simple ... 19
19.
Cercus longer than epandrium; femora mostly dark; fore basitarsus thickened
at apex; hind basitarsus with short dorsal spine; 4.5-5.5 ... gravipes
Haliday
–
Cercus shorter than epandrium ... 20
20.
Cercus broad, spearlike; surstylus baculiform; femora mostly yellow; 4.3-5.5.
Fig. 172 ... riparium (Meigen)
–
Cercus narrower than surstylus, with bunch of long setae at apex; surstylus
curved, with setae at apex; femora mostly black; 4.1-5.4. Fig. 171 ...
penicillatum
Loew
21.
Scape higher than postpedicel; postpedicel long, thin, triquetrous; cercus
long and broad; surstylus long and narrow, simple; 4.8-5.3. Fig. 165 ...
longicorne
(Fallén)
–
Postpedicel higher than scape, flattened laterally ... 22
22.
Fore basitarsus with ventral comb of strong setae, half as long as diameter
of tarsomere; cercus long and narrow, broad at base; surstylus short; 3.8-4.8.
Fig. 178 ... micans (Meigen)
–
Fore basitarsus without comb of strong setae ... 23
23.
Frons densely white or grey pollinose ... 24
–
Frons metallic, without pollen ... 27
24.
Postpedicel 2 times longer than high at base; cercus simple; surstylus
widening distad, with distal emargination; 2.8. Fig. 176 ... viklundi
Grichanov
–
Postpedicel 5-7 times longer than high; cercus bilobate; surstylus without
distal emargination ... 25
25.
Four pairs of dorsocentral setae; femora partly dark; postpedicel 6 times
longer than high; cercus with short and broad outer branch; surstylus securiform;
2.3-2.4. Fig. 149 ... albomaculatum Becker
–
Five pairs of dorsocentral setae; femora yellow ... 26
26.
Postpedicel 5 times longer than high; cercus with narrow branches; surstylus
widened at middle; 2.4-2.7. Fig. 158 ... fissum Loew
–
Postpedicel 6-7 times longer than high; cercus with broad branches; surstylus
with small inner projection; 2.0-2.3. Fig. 148 ... albifrons Zetterstedt
27.
Abdomen yellow laterally at base; cercus short, triangular; 2.0-2.5. Fig.
159 ... fasciatum (Meigen)
–
Abdomen entirely dark, usually metallic green ... 28
28.
Hind coxa with light external seta ... fissum Loew
–
Hind coxa with dark external seta ... 29
29.
Cercus elongate-triangular, with 1 long seta at apex; 2.5-3.3. Fig. 166
... monotrichum
Loew
–
Cercus without long seta at apex ... 30
30.
Surstylus with dense bunch of long setae at apex ... 31
–
Surstylus without bunch of long setae at apex ... 32
31.
Cercus long, bandlike; 2.4-3.1. Fig. 151 ... appendiculatum Zetterstedt
–
Cercus short, irregularly triangular, widened at middle; 2.8-3.3...
caliginosum
Meigen
32.
Postpedicel nearly 5 times longer than high; cercus narrow; surstylus broad,
with distal comb of setae; 2.6. Fig. 174 ... umbripenne (Frey)
–
Postpedicel approximately 4 times longer than high ... 33
33.
Stylus 1/3 length of postpedicel; cercus elongate-triangular, longer than
surstylus, with long sparse hairs; 3.3-3.5. Fig. 150...
auctum
Loew
–
Stylus 2/3 length of postpedicel; cercus short, nearly equal in length
to surstylus, with short dense hairs; 2.8-3.3. Fig. 163 ... lanceolatum
Loew