R.D.Kirkpatrick 1965 Mus musculus Howland Island, mid-Pacific Feb. Apparently no mammals are on this 12 island. No mice were seen or found day or night and no sign was found. Baker Island, mid-Pacific Feb. Mice are abundant. They were seen 3 darting from one cover to another both 4 day and night. I caught 2 ♂♂ by hand under old boards on the 7th and made them into skins and skulls RDK 549 and 550. ♀ # 551 was made into a skin and skull. Hackman and I caught and examined but did not collect: ♀ 131-67-17-12 = 7.4gm. not pg. ♀ 140-69-17-12 = 9.1gm. not pg. ♂ 145-74-18-13; testis (scrotal) 7mm - skull RDK # 552 ♂ 150-75-17-12; " " 9mm - " " " 553 ♀ 127-66-17-12; ovary minute; not pg; " " " 554 McKean Island, Phoenix Islands, mid-Pacific Feb. No Mus or other mammals on this island. 6 Major past human activity here was 19th century guano mining. No WWII airfield or other activity, apparently.