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During this summer I collected images of varios Collembola hunters.
I had Dolichopus simplex, acari (Bdellidae), Microvelia reticulata.
Yesterday I added one more hunter. As far as I understand it is also Dolichopus but another sp.
Collembola is from Isotomidae, vary possible Isotomurus palustris.
All over took about 15 min. As Paul discribed this process, after lunch you can see empty but intact skin of poor Collembola.

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A dolichopodid for sure. It looks very much like a female Campsicnemus scambus, a very common doli especially during the colder months.


Very nice observations on the feeding habits. So little is known about how these flies live & love:(

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Thank you Kahis.
Excuse me, why Campsicnemus instead of Dolichopus?

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There are numerous characters separating C. scambus from all Dolichopus species. In this case at least the following are visible:

Acrostichal setae in one line (two lines in D.)
Metallic blue frons (rare in D.)
Face very narrow below antennae (poorly visible in pic)
Legs with only sparse, short setae (D. has strong setae on hind basitarsus)
Fore femur reddish, dark near base (rare in D.)

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When I saw the image, I thought about Campsicnemus but could not recall having ever seen specimens with such dark legs.

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Kahis and Paul, thank you very much. I'll compare D. & C. images and try to find this differences.

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Here in Finland I see a lot of variability in Campsicnemus leg color. Some northern scambus have dark red-brown legs! The color of fore coxa (used as a key character for females by d'Assis-Fonseca and others) is variable enough to be useless for identification in the scambus-curvipes-loripes group.

What worries me is the silvery face. The face of C. scambus is normally yellowish grey.