V. Memmler 1942 Segmodon hispidus plenus May 4, M.V.Z., U.C. Campus, Berkeley, Alameda Co., Calif. One of these animals was loaned to me to draw for Dr. F Raymond Hall's Book on Nevada Mammals. He was borrowed from the Influenza Laboratories located on University and Acton Streets in Berkeley. His fur is similar in color to specimens from the Colorado River. He is very easily frightened and not at all tame. Most of the time he remains crouching in one corner of the cage. He seems to be more active when he is left alone, because foods, oatmeal, carrots and grass, are taken when I leave him alone. Even when he does move about the cage he never really straightens out full length but remain humped up. Only very occasionally he stands on his hind feet and reaches with his front feet up to the top of the cage along the side.