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I have posted images of two flies below, marked Fly #1 and Fly #2. Although photographed at two different beaches, at first I thought they were the same species. Then I noticed that their antennae seemed different, unless that is a misleading trick of the camera angle.

With long legs and metallic green color and wooly eyes I am thinking Doli, is that right? Any ID help will be appreciated.

Ocean beach, Oregon USA, 13 May 2007. I did not record the size of Fly #1, but Fly #2 measured about 8 mm to the back of the wings.

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A closer look at Fly #1.

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Here's fly #2, at a different beach.

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Here's a closer look at #2, a little blurred. Same family, different genus, maybe? The antennae look different, unless that is a trick of the camera angle.

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#1 of clearly a Doli. #2 is not :)

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N2 looks a Calyptrate fly, with so small eyes, may be some Nearctic Scathophagidae?

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Fly #1 needs lateral and anterior view. If it is a female, then it may belong to one of several marine shore genera of the subfamily Hydrophorinae (e.g., Conchopus, Hypocharassus etc.)

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Kahis, Nikita, Igor, Thanks very much for your help with these two flies.

I regret that I have Fly #1 from only one other angle, a sort of dorso-lateral shot that I am posting now. I don't know if this will show anything useful.