|
1a |
Wing with brown apical spot  . |
|
2 |
| b |
| Wing entirely hyaline to brown, but without apical spot. |
|
4 |
| |
|
2a |
| Eye at least 1.4 times (usually 1.5-1.55) as high as long. Frons wider than long or at most as long as wide, deeply pitted. Larger flies, wing length 4.5-6.5 mm. |
|
3 |
| b |
| Eye round, less than 1.3 (1.2-1.25) as high as long . Frons longer than wide, inconspicuously dotted. Smaller flies, wing length less than 4.5 (usually 2.5-3.5) mm. |
| U. salonikiensis Hennig |
|
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| |
|
3a |
| Halter yellow. |
| U. apicalis Meigen |
|
|
| b |
| Halter black. |
| U. megacephala Loew |
|
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| |
|
4a |
| Side of frons with triangular white microtrichose area. At least wing base (cell bc) brown. |
|
5 |
| b |
| Frons sides shining, at most eye narrowly bordered with whitish microtrichose areas. Wing variable. |
|
6 |
| |
|
5a |
| Mesonotum densely shagreened, almost matt . Wing at anterior margin (including cell c) widely brown . Frons in profile straight or slightly convex, orbital plate and gena moderately or short setose (longest setae shorter than antenna); parafacialium and face black. |
| U. atrata Loew |
|
|
| b |
| Mesonotum shining black or finely shagreened. Wing hyaline, except cell bc, base of cell c and stigma usually brown . Frons in profile usually concave, orbital plate and gena long setose (longest setae longer than antenna); parafacialium and face reddish yellow. |
| U. ruficeps Becker |
|
|
| |
|
6a |
| Tarsi entirely black. Face, gena and most of frons dark brown to black. Eye less than 1.3 (1.1-1.2) times as high as long. |
| U. omani Steyskal |
|
|
| b |
| Mid- and hindtarsi at least partly yellowish to reddish. Other characters variable. |
|
7 |
| |
|
7a |
| Anterior part of head (frons above lunule, sometimes face and parafacialium) reddish; eye round (less than 1.3 times as high as long). |
|
8 |
| b |
| Anterior part of head mainly black; eye oval (more than 1.3 times as high as long). |
|
9 |
| |
|
8a |
| Frons satin subshining and smooth in the middle, dotted laterally ; pterostigma and veins brownish; mesonotum densely shagreened, almost matt. Male hindfemur unmodified, as wide as midfemur. |
| U. facialis Hendel |
|
|
| b |
| Frons shining and pitted over whole anterior half ; pterostigma and veins hyaline, if veins darkened, then wing uniformly brownish and mesonotum shining. Male hindfemur swollen in distal part . |
| U. wadicola Steyskal |
|
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| |
|
9a |
| Wing brownish grey except basal one-quarter (fig.). Apical portion of distiphallus ("glans") with a few blunt sclerotized projections, but without claw-like or rasper-like structures (fig. ). |
| U. nigripennis Loew |
|
|
| b |
| Wing uniformly yellowish or hyaline (figs ). Apical portion of distiphallus ("glans") either with sharply pointed, claw-like projections or rasper-like structures (fig. ) |
|
10 |
| |
|
10a |
Abdominal tergites subshining, shagreened.
|
| U. semiopaca Loew |
|
|
| b |
Abdominal tergites smooth, shining.
|
|
11 |
| |
|
11a |
| Wing with yellowish tinge (figs ). Apical portion of distiphallus with blunt sclerotized projections and rasper-like structures (fig. ). |
| U. erythrophthalma Meigen |
|
|
| b |
| Wing hyaline, without yellowish tinge (figs ). Apical portion of distiphallus with sharply pointed, claw-like projections and less distinguishable rasper-like structures (fig. ). |
| U. albidipennis Loew |
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