Pholisora catullus catullus
This small skipper is in most counties in southern California, but it is not common in my experience. Generally, these lack submarginal white dots on the hindwing, or they are very small, especially compared to those considered crestar in the Sherman Pass vicinity. Catullus may be single or double-brooded, depending on conditions.
Not the best photo, but I believe this is the only Common Sootywing I've seen at Cactus Spring Trail. Turns out, since subspecies crestar was named in 2017 (and it took awhile for me to find this out), this is the only photograph I have of the nominate subspecies. All the other catullus I have seen are from the Kern/Tulare region and are crestar. So I'll need to keep an eye out for these and get some better photos. May 12, 2018.