These are "folded-wing" skippers, members of the subfamily Hesperiinae, normally referred to as "Grass" or "Branded" Skippers.

                   Grass Skippers can be confusing -- ID requires familiarity and/or a good sighting with notes or photo plus a reliable size estimate.

                   Here are the most common Bay Area skippers and their relative sizes (wingspread, per Peterson Field Guide):

                   Fiery: medium/large, 32-38 mm (short antennae; all year, mostly fall
                   Umber: medium, 28-34 mm, all year
                   Woodland: small, 20-29 mm (looks like a small Fiery; late summer
                   Sandhill: small, 20-28 mm, spring to fall
                   Rural (aka Farmer): small, 20-26 mm, late spring
                   Sachem: large, 35-41 mm; all year, mostly fall

                   I suggest using the common and familiar (if you're a lepidophile) Fiery Skipper for comparison.

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