No specimens of this species were taken in the field work in the San
Gabriels, nor did I find any rangers or residents of the mountains who
had seen flying squirrels in the area. Nevertheless sign found in the
white fir forests in the Big Pines area indicated that flying squirrels
may occur there. On a number of occasions dissected pine cones were
noted on the horizontal limbs and bent trunks of white firs. These cones
were too large to have been carried there by chipmunks, and gray
squirrels were often completely absent from the areas. I suspect that
extensive trapping in the coniferous forests of the higher parts of the
mountains would produce specimens of flying squirrels. Willett (1944:19)
mentions that flying squirrels probably occur in the San Gabriel
Mountains.