Erickson 1934 2 Thomops b. chrysopterus near center of 40+ mounds located in an area about 100 x 75 yds. 4 other settings at fresh mounds on border of this region untouched. Female sexually mature. One setting near west base of ridge had evidently trapped a gopher, but traps pulled out; one put still set found 30 yds. from hole by following track where it had dragged in sand; at this point wire connecting two evidently pulled out; no trace of other trap; sand too soft to give distinct tracks but coyote or fox probably responsible; hole was not dug out more than when set was made. Sets made where two taken on 20th untouched. Mounds where no. 389 and 4 391 taken seem too extensive to represent work of one animal, but failure to secure other individual at fresh mounds suggests they were only occupants. 8.5 mi. 4.3 mi. north of Ehrenberg, Yuma Co., Ariz. March 1, 1934 8.5 mi. north of Ehrenberg on east side of La Pay though found a few fresh gopher workings under open mesquite stand with salt grass covering ground and in one place open growth of arrowweed. Made three setting, two in clay soil one in random Feb. 20. Took one, in gopher sandy soil near arrowweed; other two untouched; rocky hills of mesa about 1 mi. to east of this point. 4.3 mi. north of Ehrenberg gopher working had been found and setting made on 20th. These mounds in still more open mesquite stand with large areas of saltgrass and