Yes, my tentative ID was using Glassberg. Here's what Jospeh Smith who coordinates the Mt. Lassen butterfly count and used to do Marin says: "These look more like sylvanoides, but it is hard to tell without an underside...this time of year its more likely the woodland, and remember sabuleti is extremely small. wing-tip markings are different than sabuleti."

So I'm confused!

For what it's worth, I'm 99% convinced these are male Polites sabuleti (common throughout California). On Ochlodes sylvanoides the sigma touches the dark subapical patch, whereas in sabuleti it does not (as seen on these two specimens). This is one of the most important identifying characteristics.

But it also should be noted, that sabuleti tends to have a more extensive dark coloring at the basal area of the hindwing, while having more defined "spikes" of orange reaching the terminal area of the HW (verses the more diffuse of sylvanoides).

That's my identification opinion. Hopefully that helps.

Not sure what book or web site you're looking at for range. They're definitely here - see CA Insects by Jerry Powell and Charles Hogue.

Skippers are difficult, and I was not trying to say they were not here in CA, just that, while I do see some differences in these and the Fiery Skippers that are posted here on this site, there is so much variation that I am not sure what you would use as a way to establish these as Sandhill Skippers.

In this site there is an interesting feature that insects are added to guide pages and therefore you can do a few things such as compare images, read comments, but also usually there is an "info" tab were you can read some facts, a "Taxonomy" tab, and one called "Data". In the data tab it simply lists logs which species have been submitted for each state. You may know all this already, but I am spelling it out to emphasize it is not always an indication of distribution, just something to look at to get ideas for what an insect might be likely to be. Whew!

So...I did not see Sandhill Skipper for CA, and thought, "Wow, if you can be sure, it is a first one in CA for the guide this year! Yay! Also, I live in the South Bay, and so am interested if it is here.

(I'm not good at short answers!)

No, I didn't know all that about this site, so thanks. I appreciate the tip.
One way to know what butterflies are in the South Bay, at least in summer, is to get hold of the NABA Butterfly Counts Report for your area if you don't already have it. There's been a South SF Bay count for about 20 years, so there's a fair amount of data.

That is a very good idea!