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What's up with these flies?

cf. det. Sara Bayzar
Loaded from my soon to be retired Diptera photo gallery: http://xespok.net/diptera/main.php
More accurate location information may be added later.

det. Sara Bayzar
Loaded from my soon to be retired Diptera photo gallery: http://xespok.net/diptera/main.php

Tricimba?
Attracted to light at night.
Loaded from my soon to be retired Diptera photo gallery: http://xespok.net/diptera/main.php
More accurate location information may be added later.

on claytonia

Found on the underside of a Rangiora leaf.

1-2 mm long.

ID is for the fly on the left.

Attempting to mate with Sepedon sp. – https://www.inaturalist.org/observations/169020472

Cochrane District, ON

In and beside waterholes in the nearly-dry Sach's Creek.

Many of these on Acacia pycnantha on my street verge. Second photo shows two adults and what I presume is a nymph.

Very small 1-1.5mm

Interesting-looking 2-mm wingless aphid swept from grasses, also posted to BG here:
https://bugguide.net/node/view/1646634

Came to LED headlamp, coastal sage scrub.

Diptera

Honestly not sure