Noffenreuter 1941 Peromyscus truei gibberti Strawberry Canyon, Berkeley, Alameda Co., Calif. (coll. by Emery Johnson) (Born in captivity from ♀ coll. in Feb., 1941) July 4. Four young born June 19, 1941 were examined. ♀ is from above locality, & collected by Emery Johnson. Eyes are open and completly covered with juvinal pelage. No ochraceous lateral line could be detected. Weight of 1 young = 7.8 grams. (15 days old). July 6 Two young examined and weighed. Both weighed 8.7 grams. One was marked with a V-notch in the left ear. July 14(2)One examined (not the one marked with a V- notch ) = weight 10.4grams. Chloroformed (=etherized) the animal and took body measurements : total, 143; tail, 67.5 (with calipers); third foot, 20.6(with calipers), ear from notch 17.0 (with calipers). This specimen marked by shallow notch in right ear. In right ear. (2nd) Specimen with V-notch in ear examined = 10.9 grams. Same measurements, taken as above, when etherized = 132-63.5-20.7-16.9 (3rd) Specimen marked by 2 small v-shaped notches in right ear. Wt. 9.8grams. Same measurements when etherized = 135-62-20.9-16.8. [Age of (1) to (3) = 25 days] Another young animal, from another litter, born May 27, (the only Specimen), weighed 15.3 grams. Measurements, when etherized, 155-79-21.3-19.0. The first 3 specimens, and a fourth one not measured, born June 19, show no visible change from the juvinal pelage. There seems to be a slight lightening of the mouse gray color above the forelegs, but this is not prominent. In the specimen born May 27, now 48 days old, there are definite ochraceous hairs, typical of the color of adults, along the lateral line and part way (about