Specimens examined.—Los Angeles County: San Antonio Canyon, 5500 ft., 2 (1 PC).
Glaucomys sabrinus californicus (Rhoads)
Northern Flying Squirrel
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.
Family GEOMYIDAE
Thomomys bottae pallescens Rhoads
Valley Pocket Gopher
This gopher was found below about 5000 feet elevation in disturbed or open areas from Cajon Wash at Devore westward all along the coastal base of the San Gabriel Range. In the lower part of the chaparral belt the gopher evidently was absent from the chaparral-covered slopes, but was common along roads and on fire trails.
Burt (1932) and von Bloeker (1932) discuss the distribution of the three subspecies of this species, pallescens, neglecta, and mohavensis, which are in the San Gabriel Mountains area, and Burt indicates that pallescens grades toward mohavensis in the southern part of Antelope Valley.