Since my original upload of this picture, I've learned more about this group of men. They are in Napa, California, and they're probably more Edwardian than Victorian (I'm still guessing). I'm not good at dating photos by the clothes worn. I still can't identify who anyone is, though two of the men appear in other portraits I've uploaded.
Since uploading this, I've learned the man on the lower right is named Philip Berrimen. The man on the upper left is named Dick Stevens.