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Hello flyforum,

In my search for S. tenuicosta, I found these fly..

I think this is also Hydrellia sp.?

Is it correct that Scatella (Ephydridae) are a bit larger in size?
Or is it my imagination?

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pic 2

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You are right, Robert.
Beware on your search that Hydrellia can be found on duckweed or simply in grass, Scatella on silt or stones near silt.
Nikita

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Hi Robert
There are big and small Scatella and Hydrellia, so size is not a good guide. Most European Scatella have darkened wings with milky-white spots. Also they have bristles along and above the mouth edge. Hydrellia have clear wings and bare faces.
Hydrellia are a difficult group to identify to species, particularly from photos, but I think I see enough of the genitalia of this male to suggest that it is Hydrellia maura.

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I found this Hidrellia in Spain. Is the same?

Date of capture: 5 June 2005, 14:00. in Mediguren (Alava), near or Vitoria. Gathered with mesh when collecting another insect (Lispe sp.) in the surface of a small puddle occasional, already almost dry. Ground on limestone marls between marly cultures and heath. Sunny day with wind. Measures 2mm between face and end of the abdomen and 3,1mm between face and end of the wings. The ruptures of the costal vein are not appraised to 80 increases although irregularities in the zones corresponding to these ruptures in the ephydridos ones are appraised. Arista of antenna hairy in the superior part.

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It is a male Hydrellia, but in this one, I cannot see the genitalia clearly enough to be able to suggest a species.