I found several of these on a plant about five meters from a river, 30 minutes after dusk. The third photo (the one with more of a lateral view) may be of a different individual.

My first thought, on seeing the patterned wings, was Sciomyzidae (marsh flies (1)) but the long antennae sure don't fit. My next thought was Trichoptera (caddisflies (2)), in particular Hydropsychidae (netspinning caddisflies) which can have long antennae and patterned wings; the next-to-river habitat seemed right. However, I can't find a Trichopteran match or near-match either here in the guide or in Marshall (3).

I couldn't think of where else to look, taxonomically.