628 Gilmae MICROTUS (cont.) (10) 1931 have been only three juveniles caught so far. In certain small areas on certain hillsides, there seems to be a concentration of a small population. The runways & burrows are thick and the first nightly trapping generally results in a full catch in the traps. Oct. 16. Akutan Bay, Akutan, S. E. Aleutians Microtus are plentiful - their runways and ephemeral pills are to be seen almost anywhere from beach line to the tops of the peaks. Wherever there is soil in which they may dig, they seem to be able to live. And they do a lot of digging for Microtus. Every once in a while I will come across an 8-10 sq. ft. area of loose dirt brought to the surface by Microtus. Their tiny burrows are found in and around these dirt areas which are generally found on some hillsides where a little horizontal or downward pushing will bring the fresh loose dirt out on top of the moss & grass.