From Toyon Ct, Tuolumne City. Early May, 2020.
These specimens are about 3 mm long.
We contacted Dr. Lori Nelsom, one of the authors of the 1997 paper, Cuticular Hydrocarbons of Reticulitermes (Isoptera: Rhinotermitidae) from Northern California Indicate Undescribed Species.
She said it is possible that these tiny termites are indeed one of undescribed species. I called the customer and asked for more details. He said the termites had come from a beam near the roof and that there were winged termites on the roof. So maybe these are drywood termites?