617. Gilmore Dicrostonyx (3) 1931 about and under the rocks but only one of the 15 traps set there produced a lemming. Sept. 19 Unalaska. Spec. 2150 was taken in the same locality as the last one. Skull was damaged and it had 3 medium sized embryos. Probably the Dicrostonyx population is larger up around Pyramid Peak which has numerous rock slides on its north & west faces. Later: Investigated Pyramid Peak & found the rock slides to be small and thin & devoid of Dicrostonyx sign. Oct. 16 Akutan Bay Akutan Is. E. Aleutians There are mouse sign up to the tops of the adjacent peaks and in the scattered rock slides but I have my doubts whether they were made by Dicrostonyx. A heavy slide that I investigated had no sign like the rock slide at Unalaska.