Peromyscus truei gilberti Oct. 12 ♀ collected by C.M. Miller at Head of Shepard's Canyon, s. of Park Blvd., Oakland, Alameda Co., Calif. Steamed the animal while chopping stump. Gave birth to 4 young sometime between 9 p.m. Oct. 12 and 2 p.m. Oct. 13. Oct. 13 2:30 p.m. Wt. of 1 animal = 2 grams. Length of hind foot, 6.4; l. of Tail 11.7 mm. Vibrissae (or nose) erect. No other hair visible & no definite concentration of black pigment. Eyes closed & ears closed. Greatest length of skull was less than 13.5 mm. Oct. 14 2:30 p.m. Wt. of 1 animal 2.6 gms; tail 12.0 mm; hind foot 7.2 mm. " " " " 2.15 " ; " 13.3 mm; " " 7.25 " No hair except vibrissae visible. No definite concentration of black pigment seems evident. There is a pure white patch beneath the skin at about the position of the liver. Do not know what this is. Ears are down tight, with the external pinna seemingly folded over and fused down. The eyes are closed tight also. Oct. 16 12:30 p.m. Wt. 1 animal = 2.5 grams. The remains of one, apparently eaten by female, were found. I think there is only 1 left. Others probably eaten. There is now a definite concentration of black on the top of the head & back (above what might be called the lateral line). Eyes closed; no hair; ears still down but not as tightly as before. Oct. 18 5:15 p.m. 1 animal still alive. Greatest length of skull less than 16.3 mm. Length of tail, 18.2 mm. Not weighed. The pinnae of the ears are no longer