by I.Ya. Grichanov

Igor Grichanov, All-Russian Institute of Plant Protection, Podbelskogo 3, St. Petersburg, Pushkin, Russia.E-mail:
Last updated: 6 May 2003 

Genus Sciapus Zeller
See pictures here
1. Third segment of fore tarsus at least as long as or rather longer than 2nd segment; ventral bristles on antennal pedicel not longer or even shorter than dorsal bristles; face narrow (even in female at most 3/20 of width of head); hind basitarsus nearly twice or even more than twice as long as 2nd segment; male with broad wing; hypopygium black, subquadrate, without organ X... 2
 Third segment of fore tarsus always shorter than 2nd segment; some ventral bristles on antennal pedicel longer than dorsal bristles; face broader (even in male at least 1/5 of width of head); hind basitarsus not much longer than 2nd segment, often even shorter; male with wing of normal width; hypopygium usually with organ X... 3
2. Male midtarsus unmodified; fore femur ventrally with a row of 7-9 long, spinelike yellow bristles; female clypeus 2 times wider than height of postpedicel; wing length less than 5 mm; 4.0-5.0 ... spiniger (Zetterstedt)
 Third and fourth segments of male midtarsus laterally compressed and slightly broadened, milky white; front femur of male ventrally with a row of pale hairs, becoming gradually longer and bristlelike on apical fourth; female clypeus about as wide as height of postpedicel; wing length of male more than 5 mm; 4.75-6.0 (male), 3.5-5.0 (female). Figs. 2, 191 ... platypterus (Fabricius)
3. Males... 4
Females ... 8
4. No organ X; cerci with a long apicoventral projection (suggesting an organ X, but not separated from cerci); frons, thorax and abdomen shining green, only very feebly dusted; fore femur ventrally on ventral half with four yellow spines, longest towards base, much longer than diameter of femur; tibia and tarsus of middle legs with a prickly appearance as a result of short erect hairs; 3.0-4.5. Fig. 188... longulus (Falln)
 Organ X present, distinctly separated from cerci; frons, thorax and abdomen with a thick dusting, hardly shining... 5

5. Fourth segment of fore tarsus entirely or largely black, broadened into a lobe;fore tarsus yellow, black on apical half of fourth segment and on fifth segment; uppermost 5-6 postocular cilia black; hypopygium with ventral margin of organ X only slightly concave, with long hairs along whole length; 4.5-6.0. Fig. 192... wiedemanni (Falln)

 Fourth segment of fore tarsus not broadened into a lobe, either white, or concolorous with other tarsal segments... 6

6. Uppermost postocular cilia white; midtibia with 3 antero and 3 posterodorsal setae (less often with only 2 antero and/or 2 posterodorsals); hind tibia likewise rather strongly bristled; metaepimeron yellow; midcoxa basally usually not darkened; 3.75-4.9. Fig. 189 ... maritimus Becker

Uppermost 6-10 postocular cilia dark. Middle tibia with only one ad near base, seldom with some more very small bristles. Hind tibia poorly bristled (generally only one ad developed). Metaepimera dark. Middle coxae darkened at base... 7

7. Hind margin of wing irregularly curved, with a bulge at tip of discal vein; fore basitarsus bearing, besides a small basal seta, 1-3 other small posteroventrals; surstylus of hypopygium not very broad, as high as process of organ X (lateral veiew); 3.9-4.5. Fig. 190 ... zonatulus (Zetterstedt)

Hind margin of wing regularly curved; fore basitarsus bearing only one small basal posteroventral seta; surstylus of hypopygium very broad, about 2 times higher than process of organ X; 4.2-4.8. Figs. 186, 187 ... basilicus Meuffels & Grootaert

8. Thorax, abdomen and frons only feebly dusted, distinctly shining; oviscapt with four slender dornen; cercus with very long bristle at tip; similar long bristles on lobes of tenth tergite; 2.75-3.0 ... longulus (Falln)

Thorax, abdomen and frons with thick dusting, only feebly shining... 9

9. Metaepimeron yellow... 10

Metaepimeron dark (as dark as pleura)... 11

10. Uppermost postocular cilia white; hind basitarsus about as long as second segment; 3.0-3.6 ... maritimus Becker

Uppermost 5-8 postocular cilia dark; 4.0-5.0... wiedemanni (Falln)

11. Fore basitarsus ventrally with some of the short hairs a little longer, giving the impression of minute spinules; mid and hind tibiae bearing several short bristles; 3.0-4.4 ... zonatulus (Zetterstedt)

 Fore basitarsus ventrally with all hairs equally long; mid and hind tibiae very poorly bristled, generally with only one anterodorsal near base; wing 4.0 ... basilicus Meuffels & Grootaert

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