Code 1958 Lemmus trimucronatus 20 June Barrow and environs No one in our party this year has yet seen a live lemming or any fresh lemming sign. A few have been brought in from the village. Yet late fall and winter cuttings are locally evident every- where and become extensive in some of the marshy areas. The amount of cutting clearly indicates that there was a moderate sized population here last fall - larger than could have been expected from the late catches on our traplids. Either the major reproductive effort occurred after we left last year, or else the animals moved in from elsewhere. At any rate, there are two enigmas represented by the present ground conditions: (1) how did so many animals get into the Barrow area after August last year, and (2) what killed them all off? In the habitats that were occupied - marshes, lake edges, troughs of polygonal ground - the vegetation over wide areas was completely cut down, but the higher ground has been little touched - as in the case in a high year. It does not seem likely that the animals ran out of food. There was a remarkable thaw-freeze