R.D. Kirkpatrick 1964 Mus musculus Sand Island, Johnston Atoll, Pacific Dec 8:30 A.M. A total of 62 Mus (including 5 unmarked ones) were caught on the grid. Midnight. The grid traps were set. Dec 8:30 A.M. A total of 59 Mus (including 6 unmarked ones) were caught on the grid. 10 P.M. The grid traps were set. Dec 9 A.M. A total of 55 Mus (including 7 unmarked ones) were caught on the grid. 6 P.M. 25 traps were set ESE of the tower. Dec 9 A.M. 21 Mus (RDK 452-RDK 472) 8 were in the traps. We autopsied them 5:30 P.M. We set the 25 Mus traps east of the tower. Flat skins, skulls, eyeballs and stomachs were saved. Dec 9 A.M. 20 Mus (RDK 473-RDK 492) 9 were in the traps. We autopsied them 7:30 P.M. We set the 25 traps west of the N-S road in the lepturus. on the west edge of the old island.