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Treebeard: Tiny fly (Diptera) on tiny Chickweed (Stellaria media) flower
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Treebeard: Golden Syrphid Flower Fly (Syrphidae, Diptera)
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Treebeard: Gorgeous fly (Diptera) perched on Coast Live Oak (Quercus agrifolia)
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Treebeard: Syrphid Flower Fly (Syrphidae, Diptera) in a flower of native Wild Blackberry (Rubus ursinus, Rosaceae)
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Treebeard: Tiny flies (Diptera) working female pistillate catkin of Arroyo Willow (Salix lasiolepis)
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Treebeard: Furry little Bee Fly (Bombyliidae, Diptera) - maybe genus Bombylius
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Treebeard: Male March Fly (Bibionidae, Diptera) on Prickly Pear (Opuntia) cactus - maybe genus Bibio?
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Treebeard: Female March Fly (Bibionidae, Diptera) on Prickly Pear (Opuntia) cactus - maybe genus Bibio?
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Treebeard: Tachinid Fly (Tachinidae, Diptera) "puddling" on damp ground
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Treebeard: Beautiful golden Syrphid Flower Fly (Syrphidae, Diptera)
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Treebeard: Odd tiny Moth Fly (Psychodidae, Diptera)
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Treebeard: Tiny fly (Diptera) on oak leaf - maybe a Tachinid Fly (Tachinidae)?
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Treebeard: Beautiful male March Fly (Bibionidae, Diptera) - maybe Bibio xanthopus?
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Treebeard: Furry little Bee Fly (Bombyliidae, Diptera) - maybe genus Bombylius?
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Treebeard: Fantastic little Crane Fly (Tipulidae, Diptera) on Wild Blackberry (Rubus ursinus, Rosaceae)
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Treebeard: Just a fly... maybe a "Root-Maggot Fly" (Anthomyiidae, Diptera)?
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Treebeard: Fantastic furry Bee Fly (Bombyliidae, Diptera) - maybe genus Bombylius?
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Treebeard: Snipe Fly (Rhagionidae, Diptera) - genus Rhagio?
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Treebeard: Bee Fly (Bombyliidae, Diptera) working Common Fiddleneck (Amsinkia menziesii var. intermedia, Boraginaceae)
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Treebeard: Mating pair of March Flies (Bibionidae, Diptera) - probably Bibio xanthopus
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Treebeard: Furry little Bee Fly (Bombyliidae, Diptera) taking "water from the rock"
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Treebeard: Tephritid Fruit Fly (Tephritidae, Diptera) on Common Bedstraw (Galium aparine, Rubiaceae)
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Treebeard: Another photo of Tephritid Fruit Fly (Tephritidae, Diptera) - maybe genus Eutreta?
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Treebeard: Perfect little Bee Fly (Bombyliidae, Diptera) - maybe genus Bombylius?
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Treebeard: Bee Fly (Bombyliidae, Diptera) approaching flower of Mountain Bluet (Centaurea montana, Asteraceae)
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Treebeard: Syrphid Flower Fly (Syrphidae, Diptera) - fallen to a Crab Spider (Thomisidae)
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Treebeard: Tiny flies (Diptera) on a flower of Miner's Lettuce (Claytonia perfoliata, Portulacaceae)
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Treebeard: Tiny fly (Diptera) - nice whiskers and eyes!
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Treebeard: Tephritid Fruit Fly (Tephritidae, Diptera) on a leaf of Canyon Sunflower (Venegasia carpesioides, Asteraceae)
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Treebeard: Pretty little Syrphid Flower Fly (Syrphidae, Diptera) on a flower of Chickweed (Stellaria media, Caryophyllaceae)