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Seen on 20 may 2011 in agricultural grasslands area border with Poplar -Willow and reedlands. Is this possibly Hybomitra lundbecki??

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pics 2

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pics 3

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How long are hairs on 1st antennal segment? As long as antennal segments 1+2 or very short?
Libor

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They are about as long as antenne segments 1+2.

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So, I see only two possibilities: Upper facets strongly enlarged, clearly separated from lower smaller facets, 1st antennal segment yellowich to yellow-brownish = H. ciureai. Upper facets not sharply separated = H. muehlfeldi. (I have not male ciureai in my collection, so I cannot compare...).
Libor

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I donot see a sharp division between larger and smaller facets only gradual differences after checking all pictures in the series I made. But my pictures are not showing sufficiently the frontside.
Hybomitra muehlfeldi is called here the "peat" hybomitra. The area I located it is a rather moist heavyclay area. Does this mean that muehlfeldi is rather unlikely? and ciureai more likely?

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I do not know situation in the Netherlands, but in CZE H. muehlfeldi prefers surroundings of ponds,but I have it from forests, etc. It dislikes dry habitats. But remember, please, that many info to habitat preferences are considering larvae developping. Adults have wings :-)
Libor

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There is a large pond nearby. I take your point about larvae and adults.

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It is clearly ciureai.

That is a remarkably early record !


Theo

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Jan, could you please post the locality of this picture ?

Thanks


Theo

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Thank you both Libor and Theo for the interesting information. The location is De Regulieren, Buurmalsen in the Betuwe The Netherlands.