Gunn 1927 53 Colorado River Sous Calf., Mex. 20 mi S. of Pilot Knob. Oct. 24, 1927 40 mouse & rat traps caught 2 sigmodon ??; two perognathus ? ?, one Mus musculus ?. Two steel sets caught nothing. 861 Thomomys ? 115.g 211-61-31-9 caught under Bermuda grass, evening catch, last night. 862 " " f 159.g 217-71-32-9 caught under Bermuda grass evening catch. 863 sigmodon ? 42.g 203-86-29-13 sandy soil Under Arrow weed. 864 " " f 46.g 221-92-30-15 " " under Arrow weed. 865 perognathus ? 18.g 165-82-23-5 sandy soil under arrow weed. I took up all mouse and rat traps but left two steel sets out as we leave tomorrow. I heard a meadow lark today for the first time since we have been here.