Erickson 1934. Harrisburg, Chrenberg, 288 ft., Yuma Co., Ariz. 26 palo verde, giant cactus mesaa. Feb. 18. Moved from Salome to Chrenburg. Ducked up a spotted skunk killed on highway in Glamossa Mts., 10 miles east of Quartzite. Camped 1/2 mi. east of Chrenburg along small wash. Ground rocky, coarse gravel and sand. Vegetation creosote, palo verde, catclaw, and quail bush. Feb. 19. Looked south along river below Chrenberg for gopher sign covering sandy ridge of rocky mesa from wagon tracks extending south. Found a few very old mounds on ridge nearest river bottom about 1 mi. south of Chrenburg, no other sign found until about 3 miles south of Chrenburg and south of a broad wash. Made 7 settings here, three last mounds on rocky mesa between four in sand at base of ridges of mesa. Feb. 20. From 7 settings had two specimens of Thomomys b chrysonotus; one from rocky part of mesa, one from sandy draw. Found additional fresh mounds in sandy draw, made ten settings. Feb. 21. Took up 10 gopher settings; took 1 female and presumably had an other gopher in one of settings, but traps gone from hole, marks of one drag along in sand followed for a distance of 30 ft. where it was found, unfurled; other not located. Sand too soft to give distinct tracks, but depressions in sand along line which setting trap was dragged suggest trap was robbed by some carnivore, about size of coyote or possibly fox. There