No. 177, _P. truei_, adult. This lactating female ran into the hollow trunk of a juniper 10 feet north of station G7a. Both lateral branches of the main trunk were rotten and hollow, but the tree appeared to be healthy. Chewed juniper seeds were present in the trunks and around the base of the tree. This female later ran to a juniper log 30 feet north of station N4d. Apparently there was no permanent nest at this site (Fig. 15). No. 178, _P. truei_, adult. This female ran into a hollow juniper tree 10 feet south of station H3c. Hundreds of old juniper seeds, with their embryos chewed out, were present at the base of the tree. The tree was not cut down. No. 238, _P. truei_, adult. This male ran into a dead juniper log 10 feet south of station O4b. Chewed juniper seeds were present on the ground, but no nest was found in the log. [Illustration: FIG. 15: Diagrams showing estimated home ranges of six individuals of two species of _Peromyscus_, and location of these ranges in the trapping grid. Nesting or hiding places are described in the text, and are indicated on each diagram by an X. Shaded areas represent home ranges estimated from trapping records for 1963; outlined, unshaded areas represent estimated home ranges for 1964.] No. 241, _P. truei_, adult. This male ran into a small hole at the base of a juniper tree 25 feet south of station G7c. The hole was at the fork of the tree, four inches above the ground, and led to a large subterranean chamber in the basal part of the trunk. This male later ran into a dead juniper log lying on the ground 20 feet southwest of station N3b. No nest was found in the log. After another capture, this mouse ran to a small juniper log 40 feet southeast of station G3d. There was a nest of shredded juniper bark and many juniper seeds inside the log (Figs. 15-17). No. 245, _P. truei_, adult. This female ran into a large, hollow juniper log 20 feet northwest of station D4d. No nest was seen, but chewed juniper seeds were noted in and around the log (Fig. 15). No. 251, _P. truei_, juvenile. This female ran into a dead juniper log beside station P4b. Chewed cones of pinyon pine and chewed juniper seeds were on the ground. A small nest of shredded juniper bark, and a few leaves of serviceberry, were found inside the log. Chewed pinyon nuts and juniper seeds also were present in the nest. [Illustration: FIG. 16: (above) Photograph of juniper log at station G3d, which contained the nest of _P. truei_ # 241.] [Illustration: FIG. 17: (below) Photograph of dissected juniper log at station G3d, showing the nest of _P. truei_ # 241, at end of mattock handle. The nest of shredded juniper bark contained chewed seeds of juniper trees.]