The lower limit of the range of this species, on the coastal face of the range, is roughly coincident with that of manzanita--that is to say, it begins in the main belt of chaparral above the lower foothills. _E. merriami_ seems to reach maximum abundance amid the granite talus, and scrub oak and _Pseudotsuga_ growth at the upper edge of the chaparral association. It was absent, however, from all but the lower fringe of the yellow pine forest association. On the desert slope _merriami_ was partial to rocky areas in the pinyon-juniper association but was also in the black oak woods on the Ball Flat fire road near Jackson Lake. Nowhere was _Eutamias merriami_ and _E. speciosus_ observed on common ground. _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. =Thomomys bottae neglectus= Bailey Valley Pocket Gopher In the forests of yellow pine and white fir of the higher parts of the San Gabriel Mountains the workings of this gopher were common, and sign of its presence was found above 4500 feet on both slopes of the mountain range. The rocky character of the coastal slope seems to limit the occurrence of gophers, for they are not continuously distributed there. On the desert slope they occur locally down into the pinyon-juniper belt.