759 Thomomys bottae leucodon (1) 2700 ft. Mad R. Jaki, above Ruth, Trinity Co., Calif. May 20, 1933 No. 2629, ad. ♀ showed very large uterus - indicates that it had just borne a litter. Teats were in four pairs - 2 pairs lower abdominally, 2 pairs thoracically & axillary. Three females 2629, 30, 31, none pregnant, though teats showing well and are probably being used at present for nursing. All later on flat damp ground near river. 2 heard in single for small biliacon bush in fench. May 22, 1933 Noted fresh burrows in small open frest on hillside 300-400 ft. above river. Douglas fir & Garry Oak around. May 23, 1933 Noted two fresh sets of workings in small gravelly open, oak covered canyon. Probably these are this form but the individuals off the Valley floor are relatively few. May 26, 1933 One burrow in loamy soil yielded one adult and two juveniles, one only several