#1
Hello,
Looking at this one I would say Keroplatidae but are there Keroplatidae with an eyebridge like this one has ?
The picture was taken near Eys, in March.
Ben
#2
Actually, this is a dark-winged fungus gnat (Sciaridae) feeding on material on the surface. That may either be some kind of liquid or, in this case propably, spores or pollen.